CN107238953A - Fibre optic isolater and optical fiber laser - Google Patents
Fibre optic isolater and optical fiber laser Download PDFInfo
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- CN107238953A CN107238953A CN201710523694.0A CN201710523694A CN107238953A CN 107238953 A CN107238953 A CN 107238953A CN 201710523694 A CN201710523694 A CN 201710523694A CN 107238953 A CN107238953 A CN 107238953A
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- polarised lights
- beam splitter
- light
- wave plate
- fibre optic
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
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- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The embodiment of the invention discloses fibre optic isolater and optical fiber laser, it is related to field of laser device technology.The fibre optic isolater includes：One or more light beam isolation structure, coupling collimater, energy-transmission optic fibre and output collimator；Wherein, the energy-transmission optic fibre connection coupling collimater and the output collimator；The light beam isolation structure includes：Diaphragm, the first beam splitter, magnetic rotation luminescent crystal, magnet, half-wave plate, fixator and the second beam splitter；Wherein, the central axis of the light hole center of the diaphragm and first beam splitter, magnetic rotation luminescent crystal, half-wave plate and the second beam splitter is on same straight line；The optical axis direction of the optical axis direction of first beam splitter and second beam splitter is orthogonal；The magnetic rotation luminescent crystal is located in the field region of the magnet；The fixator drives the half-wave plate to rotate, to adjust the optically-active angle of the half-wave plate.The isolation of the fibre optic isolater is simple in construction, easy to use.
Description
Technical field
Technical scheme disclosed in the embodiment of the present invention is related to field of laser device technology, more particularly to fibre optic isolater and optical fiber
Laser.
Background technology
At present, the power of optical fiber laser is increasing, has in fields such as military, medical treatment, industry manufactures and widely should
With.
The isolator core being made up of magnetic rotation luminescent crystal and magnet is more sensitive to temperature.When the environmental temperature is changed, it is described
The optically-active angle of magnetic rotation luminescent crystal can also change, and cause the fibre optic isolater to reduce the isolation of backlight, and cut
The weak efficiency of transmission of positive light.
Inventor has found during the present invention is studied, the main optically-active by maintaining magnetic rotation luminescent crystal in the prior art
Angle avoids the isolation of fibre optic isolater from reducing.For example, to isolator core heated at constant temperature, changing residing for magnetic rotation luminescent crystal
Magnetic field intensity etc..Isolator core heated at constant temperature is given, fibre optic isolater needs extra configuration heater and temperature control device, and this can lead
Cause fibre optic isolater complicated inconvenient for use, and high temperature demagnetization phenomenon occur to isolator core heated at constant temperature for a long time,
So that the performance reduction of fibre optic isolater.Change the magnetic field intensity residing for magnetic rotation luminescent crystal, fibre optic isolater needs extra configuration
Magnetic field intensity control device, it is complicated inconvenient for use that this also results in fibre optic isolater, and magnetic field intensity control device
Be mainly used in significantly adjusting the optically-active angle of magnetic rotation luminescent crystal, to changing because of environment temperature caused by optically-active angle trickle change
Change, the sensitivity of regulation is relatively low.
The content of the invention
Technical scheme disclosed by the invention at least can solve the problem that following technical problem：How fibre optic isolater is carried out simple
Regulation so that the isolation of the fibre optic isolater will not be reduced because changing the optically-active angle of magnetic rotation luminescent crystal.
One or more embodiment of the present invention discloses a kind of fibre optic isolater, including：One or more light beam
Isolation structure, coupling collimater, energy-transmission optic fibre and output collimator；Wherein, the energy-transmission optic fibre connection coupling collimation
Device and the output collimator；The light beam isolation structure includes：Diaphragm, the first beam splitter, magnetic rotation luminescent crystal, magnet, half-wave
Piece, fixator and the second beam splitter；Wherein, the light hole center of the diaphragm and first beam splitter, magnetic rotation luminescent crystal,
The central axis of half-wave plate and the second beam splitter is on same straight line；The optical axis direction of first beam splitter and described the
The optical axis direction of two beam splitters is orthogonal；The magnetic rotation luminescent crystal is located in the field region of the magnet；The fixator
The half-wave plate is driven to rotate, to adjust the optically-active angle of the half-wave plate.
In one or more embodiment of the present invention, the fibre optic isolater also includes expanding negative lens and collimation just
Lens；The biography energy light is coupled to by the coupling collimater by the positive light of light beam isolation structure one or more described
Fibre, is then exported to described in the form of positive collimated light by the output collimator and expands negative lens；The positive collimated light
Expanded, then exported after the collimation positive lens convergence by the negative lens that expands.
In one or more embodiment of the present invention, the light hole of positive light from the diaphragm is incident to described first
Beam splitter；First beam splitter will be beamed into the mutually perpendicular e polarised lights in polarization direction per a branch of positive light
(extraordinary light) and o polarised lights (ordinary light)；The e polarised lights and the o polarised lights pass through institute
State magnetic rotation luminescent crystal and after the half-wave plate, polarization direction is rotated by 90 °；Now, relative to second beam splitter, the e is inclined
The polarization state of light and the o polarised lights of shaking does not change, thus second beam splitter is by the e polarised lights and the o polarised lights
Synthesize a branch of positive light.
Backlight is incident to second beam splitter from the coupling collimater；Second beam splitter is by each beam reversal
Light is beamed into the mutually perpendicular e polarised lights in polarization direction and o polarised lights；The e polarised lights and the o polarised lights pass through described half
After wave plate and the magnetic rotation luminescent crystal, polarization direction rotates 0 degree；Now, relative to first beam splitter, the e polarised lights
Exchanged with the polarization states of the o polarised lights, thus first beam splitter exhales the e polarised lights and the o polarised lights
Go.
In one or more embodiment of the present invention, first beam splitter will be beamed into polarization per a branch of positive light
After the mutually perpendicular e polarised lights in direction and o polarised lights, the e polarised lights and the o polarised lights are incident to the magnetic rotation crystalline substance
Body；Under the magnetic fields of the magnet, the magnetic rotation luminescent crystal is by the polarization direction of the e polarised lights and the o polarised lights
Rotate forward 45 degree；Then, the e polarised lights and the o polarised lights are incident to the half-wave plate, and the half-wave plate is by the e
The polarization direction of polarised light and the o polarised lights rotates forward 45 degree again.
Each beam reversal's light is beamed into the mutually perpendicular e polarised lights in polarization direction and o polarised lights by second beam splitter
Afterwards, the polarization direction of the e polarised lights and the o polarised lights is reversely rotated 45 degree by the half-wave plate；Then, the e polarizations
Light and the o polarised lights are incident to the magnetic rotation luminescent crystal, and the magnetic rotation luminescent crystal is by the e polarised lights and the o polarised lights
Polarization direction rotate forward 45 degree.
In one or more embodiment of the present invention, the half-wave plate is rotated coaxially with the fixator；Rotate institute
State the optically-active angle that fixator will change the half-wave plate.
In one or more embodiment of the present invention, the fixator is marked with a plurality of graduation mark；Different scales
The optically-active angle of the half-wave plate under line correspondence different temperatures.
In one or more embodiment of the present invention, the magnet is around the magnetic rotation luminescent crystal, or the magnetic
Body is located at the side of the magnetic rotation luminescent crystal, or the magnet is located at the both sides of the magnetic rotation luminescent crystal.
In one or more embodiment of the present invention, speculum is provided with the diaphragm, for reflecting from described
First beam splitter exhales the e polarised lights and the o polarised lights come.
In one or more embodiment of the present invention, the diameter of the light hole of the diaphragm is more than the hot spot of positive light
Diameter, less than the spacing that the e polarised lights come and the o polarised lights inside edge are exhaled from first beam splitter.
One or more embodiment of the present invention also discloses a kind of optical fiber laser, including at least one Fiber isolation
Device.The fibre optic isolater is any one above-mentioned fibre optic isolater.
Compared with prior art, technical scheme disclosed by the invention mainly has following beneficial effect：
In an embodiment of the present invention, when the optically-active angle of magnetic rotation luminescent crystal changes, the fixation can be passed through
Device drives the half-wave plate to rotate, and adjusts the optically-active angle of the half-wave plate so that the optically-active angle of the half-wave plate with it is described
The optically-active angular values of magnetic rotation luminescent crystal are equal and in opposite direction.Thus reverse incident e polarised lights and o polarised lights pass through described
After half-wave plate and the magnetic rotation luminescent crystal, polarization direction still rotates 0 degree.Now, the isolation of the fibre optic isolater will not
Reduced because changing the optically-active angle of magnetic rotation luminescent crystal.For positive light, in the angle of rotation of the magnetic rotation luminescent crystal
After the optically-active angle of degree and the half-wave plate all changes, the polarization state of e polarised lights and o polarised lights from the half-wave plate outgoing will
Change.Thus reduction by a small margin is had from the hot spot ovality of the positive light of the second beam splitter outgoing.By institute
State energy-transmission optic fibre and cosmetic plus is carried out in optically-active angle and the half-wave plate in the magnetic rotation luminescent crystal to the hot spot of positive light
Optically-active angle all change after ensure the quality of positive collimated light.
Brief description of the drawings
Fig. 1 is the schematic diagram of fibre optic isolater in one embodiment of the invention；
Fig. 2 is the schematic diagram of fibre optic isolater in another embodiment of the present invention；
Fig. 3 is the schematic diagram of fibre optic isolater in another embodiment of the present invention；
Fig. 4 is the schematic diagram of fibre optic isolater in another embodiment of the present invention；
Fig. 5 is the position view of diaphragm in one embodiment of the invention；
Fig. 6 is the schematic diagram of half-wave plate and fixator in one embodiment of the invention.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Following claims, specification and Figure of description
In term " first ", " second ", " the 3rd " etc. be to be used to distinguish different objects, rather than for describing particular order.It is " positive
" reverse " in " forward direction " and " reverse rotation " in rotation " is relative.When specifying a direction of rotation for forward direction, therewith
Opposite direction of rotation is then reverse.It is rotated clockwise for example, specifying to rotate forward, then counterclockwise rotates are anti-
To rotation.
One embodiment of the invention discloses a kind of fibre optic isolater, and claimed technical scheme is illustrated.Specifically
The fibre optic isolater being related in embodiment is preferred embodiment, and all possible embodiment of non-invention or most
Good embodiment.
It is the schematic diagram of fibre optic isolater in one embodiment of the invention with reference to Fig. 1.The fibre optic isolater illustrated in Fig. 1
Including：One or more light beam isolation structure 1, coupling collimater 108, energy-transmission optic fibre 109 and output collimator 110.Its
In, the energy-transmission optic fibre 109 connects the coupling collimater 108 and the output collimator 110.
The light beam isolation structure 1 includes：Diaphragm 101, the first beam splitter 102, magnetic rotation luminescent crystal 103, magnet 104, half
Wave plate 105, the beam splitter 107 of fixator 106 and second.Wherein, the light hole center of the diaphragm 101 and first beam splitting
Device 102, magnetic rotation luminescent crystal 103, the beam splitter 107 of half-wave plate 105 and second central axis on same straight line.Described
The optical axis direction of the optical axis direction of one beam splitter 102 and second beam splitter 107 is orthogonal.The magnetic rotation luminescent crystal 103
In the field region of the magnet 104.The fixator 106 drives the half-wave plate 105 to rotate, to adjust the half-wave
The optically-active angle of piece 105.
The light hole of positive light from the diaphragm 101 is incident to first beam splitter 102.First beam splitter 12 will
The mutually perpendicular e polarised lights in polarization direction and o polarised lights are beamed into per a branch of positive light.The e polarised lights and the o polarised lights
After the magnetic rotation luminescent crystal 103 and the half-wave plate 105, polarization direction is rotated by 90 °.Now, relative to described second point
The polarization state of beam device 107, the e polarised lights and the o polarised lights does not change, thus second beam splitter 107 is inclined by the e
Shake light and the o polarised lights synthesize a branch of positive light.
Backlight is incident to second beam splitter 107 from the coupling collimater 108.Second beam splitter 107 will
Each beam reversal's light is beamed into the mutually perpendicular e polarised lights in polarization direction and o polarised lights.The e polarised lights and the o polarised lights
After the half-wave plate 105 and the magnetic rotation luminescent crystal 103, polarization direction rotates 0 degree.Now, relative to described first point
The polarization state of beam device 102, the e polarised lights and the o polarised lights is exchanged, thus first beam splitter 102 polarizes the e
Light and the o polarised lights are exhaled.
In the above embodiment of the present invention, when the optically-active angle of magnetic rotation luminescent crystal 103 changes, institute can be passed through
Stating fixator 106 drives the half-wave plate 105 to rotate, and adjusts the optically-active angle of the half-wave plate 105 so that the half-wave plate
105 optically-active angle is equal and in opposite direction with the optically-active angular values of the magnetic rotation luminescent crystal 103.Thus reverse incident e
After polarised light and o polarised lights are by the half-wave plate 105 and the magnetic rotation luminescent crystal 103, polarization direction still rotates 0 degree.This
When, the isolation of the fibre optic isolater will not be reduced because changing the optically-active angle of magnetic rotation luminescent crystal 103.
It is the schematic diagram of fibre optic isolater in another embodiment of the present invention with reference to Fig. 2.The Fiber isolation illustrated in Fig. 2
Device includes：First light beam isolation structure 1, coupling collimater 108, energy-transmission optic fibre 109, output collimator 110, expand negative lens
111 and collimation positive lens 112.The first light beam isolation structure 1 includes：Diaphragm 101, the first beam splitter 102, magnetic rotation are brilliant
Body 103, magnet 104, half-wave plate 105, the beam splitter 107 of fixator 106 and second.Wherein, the connection of energy-transmission optic fibre 109 institute
State coupling collimater 108 and the output collimator 110.The light hole center of the diaphragm 101 and first beam splitter
102nd, the central axis of magnetic rotation luminescent crystal 103, the beam splitter 107 of half-wave plate 105 and second is on same straight line.Described first
The optical axis direction of the optical axis direction of beam splitter 102 and second beam splitter 107 is orthogonal.The magnetic rotation luminescent crystal 103
In in the field region of the magnet 104.Specifically, the magnet 104 is around the magnetic rotation luminescent crystal 103, or the magnetic
Body 104 is located at the side of the magnetic rotation luminescent crystal 103, or the magnet 104 is located at the both sides of the magnetic rotation luminescent crystal 103.
The fixator 106 drives the half-wave plate 105 to rotate, to adjust the optically-active angle of the half-wave plate 105.
Fibre optic isolater in above-described embodiment can also further improve the fibre optic isolater of isolation structure in pairs.With reference to
Fig. 3, is the schematic diagram of fibre optic isolater in another embodiment of the present invention.The fibre optic isolater illustrated in Fig. 3 is described first
Light beam isolation structure 1 is additionally provided with the second light beam isolation structure 2 between collimater 108 with described couple.Second light beam diaphragm
It is identical with the construction of the first light beam isolation structure 1 from structure 2.
First beam splitter 102 will be beamed into the mutually perpendicular e polarised lights in polarization direction and o polarizations per a branch of positive light
After light, the e polarised lights and the o polarised lights are incident to the magnetic rotation luminescent crystal 103.In the magnetic fields of the magnet 104
Under, the polarization direction of the e polarised lights and the o polarised lights is rotated forward 45 degree by the magnetic rotation luminescent crystal 103.Then, institute
State e polarised lights and the o polarised lights are incident to the half-wave plate 105, the half-wave plate 105 is inclined by the e polarised lights and the o
The shake polarization direction of light rotates forward 45 degree again.The second light beam isolation structure 2 is by by described in the half-wave plate 105
E polarised lights polarize the into a branch of positive light of combiner with the o.After positive light is by the first light beam isolation structure 1, enter
The second light beam isolation structure 2.Positive light in the second light beam isolation structure 2 change of polarization state with described first
It is identical in light beam isolation structure 1.Pass through the first light beam isolation structure 1 and the positive light of the second light beam isolation structure 2
The energy-transmission optic fibre 109 is coupled to by the coupling collimater 108, then by the output collimator 110 with positive collimated light
Form export to described and expand negative lens 111.The positive collimated light is expanded by the negative lens 111 that expands, then
Exported by described collimate after positive lens 112 is assembled.
Each beam reversal's light is beamed into second beam splitter 107 into the mutually perpendicular e polarised lights in polarization direction and o is polarized
After light, the polarization direction of the e polarised lights and the o polarised lights is reversely rotated 45 degree by the half-wave plate 105.Then, the e
Polarised light and the o polarised lights are incident to the magnetic rotation luminescent crystal 103, and the magnetic rotation luminescent crystal 103 is by the e polarised lights and institute
The polarization direction for stating o polarised lights rotates forward 45 degree.First beam splitter 102 will pass through the institute of the magnetic rotation luminescent crystal 103
State e polarised lights and the o polarised lights are exhaled.Entered when the second light beam isolation structure 2 exhales next backlight
During the first light beam isolation structure 1, the first light beam isolation structure 1 will further dissipate backlight.Second light beam
Isolation structure 2 constitutes twin-stage isolation structure with the first light beam isolation structure 1, enhances the isolation of the fibre optic isolater
Degree.
In one or more preferably embodiments, the Fiber isolation in above-described embodiment can also be further improved
Device.It is the schematic diagram of fibre optic isolater in another embodiment of the present invention with reference to Fig. 4.The fibre optic isolater illustrated in Fig. 4 is in figure
The 3rd light beam isolation structure 3 and multi-fiber collimator structure 4 are additionally provided with the basis of the fibre optic isolater illustrated in 2.Multi beam is just
Multi-fiber collimator structure 4 is incident described in Xiang Guangcong, passes through the 3rd light beam isolation structure 3 and the first light beam isolation structure
The energy-transmission optic fibre 109 is coupled to by the coupling collimater 108 after 1.
The 3rd light beam isolation structure 3 includes：3rd beam splitter 301, the second magnetic rotation luminescent crystal 302, the second magnet
303rd, the second half-wave plate 304, the second fixator 305 and the 4th beam splitter 306.
Wherein, the 3rd beam splitter 301 will per a branch of positive light beam splitting be the mutually perpendicular e polarised lights in polarization direction and
O polarised lights.The e polarised lights and the o polarised lights are incident in the second magnetic rotation luminescent crystal 302, in second magnet
Under 303 magnetic fields, the second magnetic rotation luminescent crystal 302 is positive by the polarization direction of the e polarised lights and the o polarised lights
45 degree of rotation.The e polarised lights and the o polarised lights are incident to second half-wave plate 304, and second half-wave plate 304 will
The polarization direction of the e polarised lights and the o polarised lights rotates forward 45 degree again, now e polarised lights and the o polarization
The polarization direction of light has rotated forward 90 degree.
The e polarised lights and the o polarised lights are incident to the 4th beam splitter 306, due to the 4th beam splitter 306
Optical axis direction and the 3rd beam splitter 301 optical axis direction it is orthogonal, therefore for the 4th beam splitter 306
The polarization state of the e polarised lights and the polarization state of the o polarised lights do not change, and the 4th beam splitter is by the e polarised lights
A branch of positive light is synthesized with the o polarised lights.
Each beam reversal's collimated light that 4th beam splitter 306 is obtained after being expanded by backlight changes into polarization direction
Mutually perpendicular e polarised lights and o polarised lights.The e polarised lights and the o polarised lights are incident to second half-wave plate 304, institute
State the second half-wave plate 304 and the polarization direction of the e polarised lights and the o polarised lights is reversely rotated 45 degree.The e polarised lights and
The o polarised lights are incident in the second magnetic rotation luminescent crystal 302, under the magnetic fields of second magnet 303, and described
The polarization direction of the e polarised lights and the o polarised lights is rotated forward 45 degree by two magnetic rotation luminescent crystals 302.Now the e is polarized
The polarization direction of light and the o polarised lights have rotated 0 degree.The e polarised lights and the o polarised lights are incident to the 3rd beam splitting
Device 301, because the optical axis direction of the optical axis direction and the 3rd beam splitter 301 of the 4th beam splitter 306 is orthogonal, because
The polarization state of this e polarised light for the 3rd beam splitter 301 and the polarization state of the o polarised lights are exchanged, described
3rd beam splitter 301 exhales the e polarised lights and the o polarised lights.
In one or more preferably embodiments, one layer is coated with the multi-fiber collimator structure 4 or multilayer is used
In the anti-reflection film for the damage threshold for improving the multi-fiber collimator structure 4.Generally, the anti-reflection film damage threshold of itself should
More than 15J/cm2.The multi-fiber collimator structure 4 includes fiber array and collimator lens array.The outgoing of the fiber array
The incident end face of end face and/or the collimator lens array is coated with anti-reflection film described in one layer or multilayer.The fiber array with
The collimator lens array is fixed together in the way of Space Coupling or in the way of welding.Fiber array described in welding and institute
Stating the mode of collimator lens array includes electric discharge welding, laser welding etc..
In one or more preferably embodiments, the multi-fiber collimator structure 4 includes fiber array and collimation post
Lens/aspheric collimation lens.The outgoing end face of the fiber array and/or the collimation post lens/aspheric collimation lens
Incident end face be coated with the anti-reflection film that one layer or multilayer are used to improve damage threshold.The fiber array and the collimation post are saturating
Mirror/aspheric collimation lens are fixed together in the way of Space Coupling or in the way of welding.Fiber array described in welding with
The mode of the collimation post lens/aspheric collimation lens includes electric discharge welding, laser welding etc..
In one or more preferably embodiments, the multi-fiber collimator structure 4 includes the N number of list being fixed together
Fine collimater, N is the integer more than or equal to 2.The outgoing end face and/or N number of single fiber of the optical fiber of N number of single fiber collimater
The incident end face of the collimation lens of collimater is coated with the anti-reflection film that one layer or multilayer are used to improve damage threshold.
One layer or multilayer are coated with multi-fiber collimator structure 4 in above-described embodiment to be used to improve the anti-reflection of damage threshold
Film, can increase substantially the damage threshold of the fibre optic isolater, it is to avoid the fibre optic isolater burns during light extraction.
In addition, laser is divided into the positive light of multi beam by the multi-fiber collimator structure 4 is incident to the light beam isolation structure 3 and described first
Light beam isolation structure 1, therefore it is incident to every a branch of forward direction of the light beam isolation structure 3 and the first light beam isolation structure 1
The energy density reduction of light.The light beam isolation structure 3 and the first light beam isolation structure 1 will be changed into per a branch of positive light
The mutually perpendicular e polarised lights in polarization direction and o polarised lights, finally again synthesize the e polarised lights and the o polarised lights a branch of
Positive light, thus the light beam isolation structure 3 and the first light beam isolation structure 1 have divided every a branch of positive light equally in each light
Energy density on educational circles face, reduces heat history and thermal lensing effect.The light beam isolation structure 3 and first light beam diaphragm
The each beam reversal's collimated light obtained after being expanded from structure 1 by backlight changes into the mutually perpendicular e polarised lights in polarization direction
With o polarised lights, finally the e polarised lights and the o polarised lights are exhaled.In summary, the optical fiber in above-described embodiment
Isolator be effectively prevent during light extraction and be burnt by laser by improving damage threshold and bear threshold value to laser power
Ruin, the efficiency of transmission of positive light is effectively increased by the isolation strengthened to backlight so that the fibre optic isolater can
Apply in the higher laser of power.
In one or more preferably embodiments, the Fiber isolation in above-described embodiment can also be further improved
Device.It is the position view of diaphragm 101 in one embodiment of the invention with reference to Fig. 5.The diameter x of the light hole of the diaphragm 101
More than the spot diameter y of positive light, the e polarised lights come and o polarizations are exhaled less than from first beam splitter 102
The spacing z of light inside edge.Therefore, positive light can be all by the light hole of the diaphragm 101, and from first beam splitting
Device 102, which exhales the e polarised lights come and the o polarised lights, can not then incide the light hole of the diaphragm 101.The light
Door screen 101 can play a part of isolating backlight.
In one or more preferably embodiments, the diaphragm 101 can also be further improved.For example, described
Speculum (not shown) is set on diaphragm 101, the e polarised lights come are exhaled for reflecting from first beam splitter 102
With the o polarised lights.
In one or more preferably embodiments, the Fiber isolation in above-described embodiment can also be further improved
Device.It is the schematic diagram of half-wave plate 105 and fixator 106 in one embodiment of the invention with reference to Fig. 6.The half-wave plate 105 and institute
Fixator 106 is stated to rotate coaxially.Rotate the optically-active angle that the fixator 106 will change the half-wave plate 105.The fixator
106 are marked with a plurality of graduation mark.The optically-active angle of the half-wave plate 105 under different graduation mark correspondence different temperatures.As in Fig. 6
Signal, the fixator 106 is marked with 5 DEG C, 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C, 40 DEG C and 45 DEG C of quarter
Spend line.Rotating the fixator 106 allows the graduation mark of a certain temperature to be directed at the datum line on the fibre optic isolater, the half-wave
The optically-active angle of piece 105 will be adjusted to corresponding numerical value.For the optically-active angle of half-wave plate 105 described in accurate adjustment, Ke Yirang
The fixator 106 rotates a larger angle and the half-wave plate 105 rotates a less angle.
When the environment temperature residing for the fibre optic isolater changes, the optically-active angle of the magnetic rotation luminescent crystal 103 will
Change.By rotating the half-wave plate 105 so that the optically-active angle of the half-wave plate 105 and the magnetic rotation luminescent crystal 103
Optically-active angular values it is equal and direction of rotation is opposite.Thus reversely the e polarised lights and o polarised lights of incidence pass through the half-wave plate
105 and the magnetic rotation luminescent crystal 103 after, polarization direction still rotates 0 degree.For first beam splitter 102, reversely enter
The e polarised lights and o polarised lights penetrated retrodeviate polarization state by the half-wave plate 105 and the magnetic rotation luminescent crystal 103 to be changed.Cause
This, first beam splitter 102 still can be exhaled reverse incident e polarised lights and o polarised lights with maximum deflection angle
Go.That is, the fibre optic isolater still isolates backlight with maximum isolation degree.The second light beam isolation structure 2 can be adopted
With the isolation of the second light beam isolation structure 2 is adjusted with the identical structure of the first light beam isolation structure 1, play pair
The effect of backlight dual resisteance.
For positive light, in the optically-active angle and the optically-active angle of the half-wave plate 105 of the magnetic rotation luminescent crystal 103
After all changing, the polarization state of e polarised lights and o polarised lights from the outgoing of half-wave plate 105 will change.Thus from described the
The hot spot ovality of the positive light of the outgoing of two beam splitter 107 has reduction by a small margin.For example, at 25 DEG C, along positive light
The optically-active angle of magnetic rotation luminescent crystal 103 described in optical path direction is positive 45 degree, and the optically-active angle of the half-wave plate 105 is also forward direction
45 degree.Now, the optical quality of the positive light of the fibre optic isolater output is optimal.It is assumed that in a certain temperature, along positive light
Optical path direction described in the optically-active angle of magnetic rotation luminescent crystal 103 be changed into positive 43 degree, in order to allow the angle of rotation of the half-wave plate 105
Degree is equal with the optically-active angle of the magnetic rotation luminescent crystal 103, and the half-wave plate 105 can be allowed to rotate backward 1 degree so that described half
The optically-active angle of wave plate 105 is changed into positive 43 degree.Now, the hot spot by the positive light of the first light beam isolation structure 1 is ellipse
Circularity can be reduced on a small quantity, but still can be coupled to the energy-transmission optic fibre 109 by the coupling collimater 108.And the biography energy
Optical fiber 109 can carry out shaping to the hot spot of positive light.In general, 20 DEG C of temperature change, the rotation of the magnetic rotation luminescent crystal 103
Angular changes 4 degree ± 0.5 degree.Adjust the optically-active angle of the half-wave plate 105 so that the optically-active angle of the half-wave plate 105
Equal with the optically-active angle of the magnetic rotation luminescent crystal 103, the hot spot ovality of the laser of the fibre optic isolater output still exists
More than 95%.Therefore the optically-active angle of the half-wave plate 105 is adjusted by rotating the half-wave plate 105, can not only ensure institute
The isolation that the first light beam isolation structure 1 is stated to backlight is maximum, and the fibre optic isolater remains able to export more high-quality
The laser of amount.
In above-described embodiment, the quality of the isolation of the fibre optic isolater and positive collimated light will not be because of magnetic rotation luminescent crystal
103 optically-active angle changes and reduced.The Fiber isolation connects the coupling collimater by the energy-transmission optic fibre 109
108 and the output collimator 110, and the energy-transmission optic fibre 109 can carry out shaping to the hot spot of positive light.Therefore it is final from
The positive collimated light of the collimation outgoing of positive lens 112 still can be hot spot ovality very high positive collimated light.This is favourable
Ensure positive collimation after all changing in the optically-active angle of the magnetic rotation luminescent crystal 103 and the optically-active angle of the half-wave plate 105
The quality of light.In addition, the fibre optic isolater is simple in construction, it is easy to use.
With reference to the fibre optic isolater in above-described embodiment, one embodiment of the invention discloses a kind of optical fiber laser.It is described
Optical fiber laser includes at least one fibre optic isolater.The fibre optic isolater be above-described embodiment in any one optical fiber every
From device.
Finally it should be noted that：Above example is only to the technical scheme for illustrating the application, rather than its limitations.Although
The application is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that, it still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic.
And these modification or replace, do not make appropriate technical solution essence depart from each embodiment technical scheme of the application spirit and
Scope.
Claims (10)
1. a kind of fibre optic isolater, it is characterised in that including：One or more light beam isolation structure, coupling collimater, biography energy
Optical fiber and output collimator；Wherein, the energy-transmission optic fibre connection coupling collimater and the output collimator；
The light beam isolation structure includes：Diaphragm, the first beam splitter, magnetic rotation luminescent crystal, magnet, half-wave plate, fixator and
Two beam splitters；Wherein, the light hole center of the diaphragm and first beam splitter, magnetic rotation luminescent crystal, half-wave plate and second
The central axis of beam splitter is on same straight line；The optical axis of the optical axis direction of first beam splitter and second beam splitter
Direction is orthogonal；The magnetic rotation luminescent crystal is located in the field region of the magnet；The fixator drives the half-wave plate
Rotate, to adjust the optically-active angle of the half-wave plate.
2. fibre optic isolater according to claim 1, it is characterised in that the fibre optic isolater also includes expanding negative lens
With collimation positive lens；
The biography energy light is coupled to by the coupling collimater by the positive light of light beam isolation structure one or more described
Fibre, is then exported to described in the form of positive collimated light by the output collimator and expands negative lens；The positive collimated light
Expanded, then exported after the collimation positive lens convergence by the negative lens that expands.
3. fibre optic isolater according to claim 1 or 2, it is characterised in that：
The light hole of positive light from the diaphragm is incident to first beam splitter；First beam splitter will be per a branch of positive light
It is beamed into the mutually perpendicular e polarised lights in polarization direction and o polarised lights；The e polarised lights and the o polarised lights pass through the magnetic rotation
After luminescent crystal and the half-wave plate, polarization direction is rotated by 90 °；Now, relative to second beam splitter, the e polarised lights and
The polarization state of the o polarised lights does not change, thus second beam splitter synthesizes the e polarised lights and the o polarised lights
A branch of positive light；
Backlight is incident to second beam splitter from the coupling collimater；Second beam splitter divides each beam reversal's light
Beam is into the mutually perpendicular e polarised lights in polarization direction and o polarised lights；The e polarised lights and the o polarised lights pass through the half-wave plate
After the magnetic rotation luminescent crystal, polarization direction rotates 0 degree；Now, relative to first beam splitter, the e polarised lights and institute
The polarization state for stating o polarised lights is exchanged, thus first beam splitter exhales the e polarised lights and the o polarised lights.
4. fibre optic isolater according to claim 3, it is characterised in that：
First beam splitter will be beamed into after the mutually perpendicular e polarised lights in polarization direction and o polarised lights per a branch of positive light, institute
State e polarised lights and the o polarised lights are incident to the magnetic rotation luminescent crystal；Under the magnetic fields of the magnet, the magnetic rotation
The polarization direction of the e polarised lights and the o polarised lights is rotated forward 45 degree by crystal；Then, the e polarised lights and the o
Polarised light is incident to the half-wave plate, and the half-wave plate is positive again by the polarization direction of the e polarised lights and the o polarised lights
45 degree of rotation；
Each beam reversal's light is beamed into after the mutually perpendicular e polarised lights in polarization direction and o polarised lights by second beam splitter, institute
State half-wave plate and the polarization direction of the e polarised lights and the o polarised lights is reversely rotated 45 degree；Then, the e polarised lights and institute
State o polarised lights and be incident to the magnetic rotation luminescent crystal, the magnetic rotation luminescent crystal is by the e polarised lights and the polarization of the o polarised lights
Direction rotates forward 45 degree.
5. fibre optic isolater according to claim 1 or 2, it is characterised in that the half-wave plate and the fixator are coaxial
Rotate；Rotate the optically-active angle that the fixator will change the half-wave plate.
6. fibre optic isolater according to claim 5, it is characterised in that the fixator is marked with a plurality of graduation mark；No
The optically-active angle of the half-wave plate under same graduation mark correspondence different temperatures.
7. fibre optic isolater according to claim 1 or 2, it is characterised in that the magnet surround the magnetic rotation luminescent crystal,
Either the magnet is located at the side of the magnetic rotation luminescent crystal or the magnet is located at the both sides of the magnetic rotation luminescent crystal.
8. fibre optic isolater according to claim 1 or 2, it is characterised in that be provided with speculum on the diaphragm, be used for
Reflect the e polarised lights and the o polarised lights for exhaling to come from first beam splitter.
9. fibre optic isolater according to claim 8, it is characterised in that the diameter of the light hole of the diaphragm is more than forward direction
The spot diameter of light, less than the e polarised lights and the o polarised lights inside edge exhaled from first beam splitter
Spacing.
10. a kind of optical fiber laser, including at least one fibre optic isolater, it is characterised in that the fibre optic isolater is right
It is required that the fibre optic isolater described in 1 to 9 any one.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710523694.0A CN107238953B (en) | 2017-06-30 | 2017-06-30 | Fibre optic isolater and optical fiber laser |
| PCT/CN2017/113853 WO2019000833A1 (en) | 2017-06-30 | 2017-11-30 | Method for adjusting degree of isolation, optical fiber isolator, and fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710523694.0A CN107238953B (en) | 2017-06-30 | 2017-06-30 | Fibre optic isolater and optical fiber laser |
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| CN107238953B CN107238953B (en) | 2018-08-17 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942542A (en) * | 2017-12-31 | 2018-04-20 | 深圳市创鑫激光股份有限公司 | Optoisolator, laser export head, laser |
| WO2019000833A1 (en) * | 2017-06-30 | 2019-01-03 | 深圳市创鑫激光股份有限公司 | Method for adjusting degree of isolation, optical fiber isolator, and fiber laser |
| CN111722421A (en) * | 2019-03-21 | 2020-09-29 | 光越科技(深圳)有限公司 | Optical isolator and laser |
| CN113009631A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Multifunctional optical isolator, amplifier, laser and debugging method |
| CN115032745A (en) * | 2022-08-15 | 2022-09-09 | 光越科技(深圳)有限公司 | Online optical isolator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6075642A (en) * | 1998-06-18 | 2000-06-13 | Hewlett-Packard Company | Multi-port optical isolator |
| CN201429752Y (en) * | 2009-07-07 | 2010-03-24 | 福州高意通讯有限公司 | Optical isolator |
| CN203551835U (en) * | 2013-09-23 | 2014-04-16 | 深圳市创鑫激光技术有限公司 | Hundred-watt level collimation type isolator |
| CN103941341A (en) * | 2014-04-14 | 2014-07-23 | 深圳朗光科技有限公司 | Waveband-tunable broadband optical isolator and tunable laser |
| CN106066512A (en) * | 2016-08-22 | 2016-11-02 | 深圳市创鑫激光股份有限公司 | Optoisolator |
-
2017
- 2017-06-30 CN CN201710523694.0A patent/CN107238953B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6075642A (en) * | 1998-06-18 | 2000-06-13 | Hewlett-Packard Company | Multi-port optical isolator |
| CN201429752Y (en) * | 2009-07-07 | 2010-03-24 | 福州高意通讯有限公司 | Optical isolator |
| CN203551835U (en) * | 2013-09-23 | 2014-04-16 | 深圳市创鑫激光技术有限公司 | Hundred-watt level collimation type isolator |
| CN103941341A (en) * | 2014-04-14 | 2014-07-23 | 深圳朗光科技有限公司 | Waveband-tunable broadband optical isolator and tunable laser |
| CN106066512A (en) * | 2016-08-22 | 2016-11-02 | 深圳市创鑫激光股份有限公司 | Optoisolator |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019000833A1 (en) * | 2017-06-30 | 2019-01-03 | 深圳市创鑫激光股份有限公司 | Method for adjusting degree of isolation, optical fiber isolator, and fiber laser |
| CN107942542A (en) * | 2017-12-31 | 2018-04-20 | 深圳市创鑫激光股份有限公司 | Optoisolator, laser export head, laser |
| CN111722421A (en) * | 2019-03-21 | 2020-09-29 | 光越科技(深圳)有限公司 | Optical isolator and laser |
| CN113009631A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Multifunctional optical isolator, amplifier, laser and debugging method |
| CN115032745A (en) * | 2022-08-15 | 2022-09-09 | 光越科技(深圳)有限公司 | Online optical isolator |
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| Publication number | Publication date |
|---|---|
| CN107238953B (en) | 2018-08-17 |
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