CN106862759A - The processing unit (plant) and processing method of a kind of fiber end face - Google Patents
The processing unit (plant) and processing method of a kind of fiber end face Download PDFInfo
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- CN106862759A CN106862759A CN201710257301.6A CN201710257301A CN106862759A CN 106862759 A CN106862759 A CN 106862759A CN 201710257301 A CN201710257301 A CN 201710257301A CN 106862759 A CN106862759 A CN 106862759A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Optical Couplings Of Light Guides (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides the processing unit (plant) and processing method of a kind of fiber end face, including tunable laser and the spatial filter, impulse generator, direction regulator, the first lens and the optical fiber that are successively set in tunable laser light extraction light path；Tunable laser is used to produce the laser of continuous output；Spatial filter is used to filter the high-order transverse mode light in laser, retains the fundamental transverse mode light in laser；Impulse generator makes the pulsewidth of laser pulse to preset pulsewidth for the laser of continuously output to be adjusted to the laser pulse of discontinuous output；Direction regulator is used to adjust the transmission direction of laser pulse, has the laser pulse of default spot tracks to obtain；First lens are used for the end face of focusing laser pulses to optical fiber, the end face of optical fiber is processed with using the laser pulse with default spot tracks, such that it is able to fiber end face to be processed into the end face of various face types, such as end face of concave spherical surface and concave ellipsoidal surface face type.
Description
Technical field
The present invention relates to technical field of optical fiber, more specifically to a kind of processing unit (plant) of fiber end face and processing side
Method.
Background technology
In recent years, possess the optical resonator of high-fineness and small mode volume due to size it is small, tunable,
Can direct fiber coupling and the advantages of integrated level high, have become the powerful of enhancing interaction of laser with material.
Concave surface is processed into by fiber end face in the prior art, then by two fiber end face combinations of concave surface, carrys out structure
Into an optical resonator for micron-scale.Due to this optical resonator size than traditional optical resonator size extremely
When young two orders of magnitude, therefore, it has boundless application prospect.But, existing processing method can only be by optical fiber end
The concave surface of given shape is processed into face, so as to limit the miniature optical resonant cavity i.e. application of optical fiber microcavity of optical fiber concave surface composition
Scope.
The content of the invention
In view of this, the invention provides the processing unit (plant) and processing method of a kind of fiber end face, fiber end face is added
Work into different curvature radius concave spherical surface or concave ellipsoidal surface, to expand the range of application of optical fiber microcavity.
To achieve the above object, the present invention provides following technical scheme：
A kind of processing unit (plant) of fiber end face, including tunable laser and it is successively set on the tunable laser
Spatial filter, impulse generator, direction regulator, the first lens and optical fiber in light extraction light path；
The tunable laser is used to produce the laser of continuous output；
The spatial filter is used to filter the high-order transverse mode light in the laser, retains the fundamental transverse mode in the laser
Light；
The impulse generator is used to be adjusted to the laser of the continuous output laser pulse of discontinuous output, and makes
The pulsewidth of the laser pulse is default pulsewidth；
The direction regulator is used to adjust the transmission direction of the laser pulse, has default spot tracks to obtain
Laser pulse；
First lens are used for the end face of the focusing laser pulses to the optical fiber, with described default using having
The laser pulse of spot tracks is processed to the end face of the optical fiber.
Preferably, the spatial filter includes that be successively set in the tunable laser light extraction light path second is saturating
Mirror and the shadow shield with through hole；
Second lens are used in the through hole of the Laser Focusing to the shadow shield, are filtered with by the through hole
High-order transverse mode light in the laser, retains the fundamental transverse mode light in the laser.
Preferably, the impulse generator is shutter；The direction regulator is pendulum mirror；
The shutter is switched according to the first predeterminated frequency, the laser of the continuous output is converted to described discontinuous defeated
The laser pulse for going out；
The pendulum mirror swings according to default swaying direction and the second predeterminated frequency, to adjust the transmission side of the laser pulse
To, and obtain the laser pulse with default spot tracks.
Preferably, also include：
The controller being connected with the shutter and pendulum mirror；
The controller is used to be controlled according to first predeterminated frequency switch of the shutter, according to the default swing
Direction and the swing of the second predeterminated frequency control pendulum mirror；
First predeterminated frequency is equal with second predeterminated frequency.
Preferably, also include：
It is arranged on the beam splitter between the tunable laser and the spatial filter；
The beam splitter is used for the part laser reflection to the spatial filter, and laser described in other parts is saturating
It is incident upon power meter；
The power meter is used to measure the power of the tunable laser.
Preferably, also include：
Optical system, the optical system is used to regulate and control the locus of the optical fiber.
Preferably, the optical system includes adjustment platform, the first microscope, automatically controlled upset mirror and the second microscope；
The adjustment platform is used to clamp and fix the optical fiber, and, adjust the optical fiber in a first direction and second party
Upward position, the second direction is vertical with the first direction；
First microscope and the automatically controlled upset mirror are used to observe optical fiber position in this second direction；
Second microscope is used to observe optical fiber position in said first direction.
Preferably, the processing unit (plant) described in as above any one is applied to, including：
The laser of continuous output is produced using tunable laser；
Utilization space wave filter filters the high-order transverse mode light in the laser, retains the fundamental transverse mode light in the laser；
The laser of the continuous output is converted to the laser pulse of discontinuous output using impulse generator, and is made described
The pulsewidth of laser pulse is default pulsewidth；
Utilization orientation adjuster adjusts the transmission direction of the laser pulse, the laser to obtain with default spot tracks
Pulse；
Using the first lens by the end face of the focusing laser pulses to the optical fiber, with using with the spot tracks
Laser pulse the end face of the optical fiber is processed.
Preferably, when the processing unit (plant) also includes beam splitter and power meter, also include：
It is using the beam splitter by the part laser reflection to the spatial filter, laser described in other parts is saturating
It is incident upon the power meter；
The power of the laser is measured using the power meter.
Preferably, when the processing unit (plant) also includes optical system, also include：
Regulate and control the locus of the optical fiber using the optical system.
Preferably, when the optical system includes adjustment platform, the first microscope, automatically controlled upset mirror and the second microscope,
The locus for regulating and controlling the optical fiber using optical system includes：
Using adjustment platform clamping and the fixation optical fiber；
Using first microscope and optical fiber position in a second direction described in the automatically controlled upset sem observation, utilize
Optical fiber position in a first direction described in the second micro- sem observation；
The position of the optical fiber on the first direction and the second direction is adjusted using the adjustment platform, described the
Two directions are vertical with the first direction.
Compared with prior art, technical scheme provided by the present invention has advantages below：
The processing unit (plant) and processing method of fiber end face provided by the present invention, by impulse generator by continuous output
Laser is adjusted to the laser pulse of discontinuous output, and makes the pulsewidth of laser pulse to preset pulsewidth, is adjusted by direction regulator
The transmission direction of laser pulse is saved, there is the laser pulse of default spot tracks to obtain, laser pulse is poly- by the first lens
It is defocused, the default spot tracks of the shapes such as point, line, circle or ellipse are formed in fiber end face, such that it is able to fiber end face is processed
Into the end face of various face types, such as end face of concave spherical surface and concave ellipsoidal surface face type；
Also, by adjusting the power of laser, the default pulsewidth of laser pulse and default spot tracks and the first lens
With the concave spherical surface or concave ellipsoidal surface that fiber end face can be processed into different curvature radius for the distance between optical fiber, so as to expand
The range of application of optical fiber microcavity.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of the processing unit (plant) of fiber end face provided in an embodiment of the present invention；
Fig. 2 is the structural representation of the processing unit (plant) of another fiber end face provided in an embodiment of the present invention；
Fig. 3 is the structural representation of the processing unit (plant) of another fiber end face provided in an embodiment of the present invention；
Fig. 4 be single laser pulse hot spot optical fiber end face position view；
Fig. 5 is schematic cross-section of the optical fiber shown in Fig. 4 along axis；
Fig. 6 is the radius of curvature of concave spherical surface with the relation schematic diagram of the changed power of single laser pulse；
Fig. 7 be default spot tracks for straight line hot spot optical fiber end face position view；
Fig. 8 is schematic cross-section of the optical fiber shown in Fig. 7 along axis；
The relation schematic diagram that Fig. 9 changes for the ellipticity of concave ellipsoidal surface with laser pulse interval；
Figure 10 is a kind of flow chart of the processing method of fiber end face provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
A kind of processing unit (plant) of fiber end face is the embodiment of the invention provides, as shown in figure 1, the processing unit (plant) is including adjustable
Humorous laser 10 and the spatial filter 11 being successively set in the light extraction light path of tunable laser 10, impulse generator 12,
Direction regulator 13, the first lens 14 and optical fiber 15.
Wherein, tunable laser 10 is used to produce the laser of continuous output.Alternatively, the tunable laser 10 is work(
The adjustable carbon dioxide laser of rate, certainly, the present invention is not limited to this, in other embodiments, tunable laser 10
It can also be other kinds of laser.Still optionally further, the tunable laser 10 in the present embodiment is model
The laser of Firestar-V40 models, its wavelength is 10.6 μm, and the laser has larger power, preferable beam quality
And stability.
As shown in figure 1, the spatial filter 11 in the present embodiment includes being successively set on the light extraction light of tunable laser 10
The second lens 110 on road and the shadow shield 111 with through hole 111a.Wherein, the second lens 110 are used for Laser Focusing to screening
In the through hole of tabula rasa 111, to filter by through hole 111a the high-order transverse mode light in laser, retain the fundamental transverse mode light in laser.By
It is Gaussian beam in the laser for retaining fundamental transverse mode light, the circular symmetry with Energy distribution therefore, it can the end face in optical fiber 15
Obtain the hot spot of energy circular symmetry distribution.
Alternatively, the second lens 110 in the present embodiment are focal length zinc selenide lens.Still optionally further, the second lens
110 is the lens of model LB7887-F models, and the focal length f=200mm of the lens can cause that laser is formed in its focal point
The hot spot of large-size, so as to be conducive to the through hole 111a using shadow shield 111 to filter the spatial model outside fundamental transverse mode, obtains
The rotationally symmetrical hot spot of Energy distribution.
In the present embodiment, shadow shield 111 is the aperture shadow shield of P800S models, and the size of its through hole 110a is through logical
The half of the diffraction pattern size after the 110a of hole, certainly, the present invention is not limited to this, in other embodiments, can use
The shadow shield of other models, as long as the size of its through hole 110a is smaller than the size of diffraction pattern.
In the present embodiment, the size of diffraction pattern can be calculated according to formula D=λ f/r, wherein, D is diffraction pattern
Diameter, λ is the wavelength of laser, and r is through the light being irradiated to after the second lens 110 on through hole 110a for the radius of launching spot
The radius of spot.
In the present embodiment, impulse generator 12 is preferably shutter, and direction regulator 13 is preferably puts mirror.Alternatively, this reality
It is the shutter of SH1/M models to apply shutter in example, and the controller of the shutter is the controller of SC10 models, during its most short opening
Between be 10ms, certainly, the present invention is not limited to this, in other embodiments, can be other kinds of optical shutter, but,
Shutter has to bear certain power, and the most hand-to-hand fight in tights ETAD expected time of arrival and departure of shutter will can reach 10ms~50ms.Alternatively, this reality
It is the piezoelectric ceramics beat mirror of S-330.2SD models to apply the pendulum mirror in example, and the controller of the pendulum mirror is the control of E-727.3SD models
Device processed, the pendulum mirror has precision and good stability higher, and certainly, the present invention is not limited to this, in other implementations
In example, can be using other types and the pendulum mirror of model.
Wherein, shutter is switched according to the first predeterminated frequency, and when the shutter is opened, laser passes through, when shutter close, laser
Cut-off, thus, the laser of continuous output can be converted to shutter the laser pulse of discontinuous output.Also, it is fast by control
The switching frequency of door is the time opened and the time closed, and the pulse width time i.e. pulsewidth that can control laser pulse is default arteries and veins
It is wide.Alternatively, the switch time of shutter is 10ms~100ms.Further, the first predeterminated frequency of shutter opening more than shutter
The pass time.
Pendulum mirror includes driver part and speculum, the speculum total reflective mirror gold-plated for minute surface is pasted with.Alternatively, this is anti-
Penetrate mirror be NB1-L01 models speculum, it has long-time stability, and reflectivity is up to 99%, certainly, the present invention and not only
It is limited to this, it can use other kinds of speculum.
In the present embodiment, as shown in figure 1, driver part can drive total reflective mirror, and a and second direction b puts in the first direction
It is dynamic, so as to incide the laser pulse of total reflective mirror with different space angle outgoing, you can incide swashing for total reflective mirror to adjust
The transmission direction of light pulse.Alternatively, the driver part can be motor etc..When pendulum mirror according to default swaying direction (such as
When first direction a or second direction b) and the second predeterminated frequency swing, the laser pulse with default spot tracks can be obtained.
When it is that total reflective mirror does not swing that the second predeterminated frequency is equal to zero, spot tracks are a little；When the second predeterminated frequency is all-trans more than zero
When mirror swings according to default swaying direction, spot tracks can be straight line, circular or ellipse etc..
Additionally, the processing unit (plant) of the fiber end face in the present embodiment also includes the controller being connected with shutter and pendulum mirror, should
Controller is used to be controlled according to the first predeterminated frequency the switch of shutter, and reversely pendulum is controlled with the second predeterminated frequency according to default swing
The swing of mirror.Optionally, the controller adds the data collecting card of 781438-01 models for computer, certainly, the present invention and not only
It is limited to this, can is the control terminal of other models in other embodiments.
Wherein, the default pulsewidth of laser pulse can be defined according to actual needs, also, can also be according to default arteries and veins
The switching frequency for obtaining shutter wide is the first predeterminated frequency, and then can control shutter according to the first predeterminated frequency by controller
Open and close.The end face of the optical fiber 15 of different faces type can be formed due to different spot tracks, be therefore, it can according to default
The default swaying direction and hunting frequency that spot tracks obtain the total reflective mirror of pendulum mirror are the second predeterminated frequency, and then can be by control
Device processed is swung according to the total reflective mirror of default swaying direction and the second predeterminated frequency control pendulum mirror.
Alternatively, the first predeterminated frequency in the present embodiment is equal to the second predeterminated frequency, based on this, when pendulum mirror swings to one
After fixed space angle, shutter is opened, and pendulum mirror is reflected the laser pulse by shutter, such that it is able to realize a space
Angle one laser pulse of default pulsewidth of correspondence.
In the present embodiment, the first lens 14 are the non-spherical lens of material zinc selenide.Alternatively, the first lens 14 are
The lens of AL72525-G models, it has less aberration, and certainly, the present invention is not limited to this.By after shutter and pendulum mirror
Laser pulse focused on the end face of optical fiber 15 by the first lens 14, default spot tracks can be obtained in end face, such as
Point, straight line, circle or oval spot tracks, it is hereby achieved that the end face of different faces type, such as concave spherical surface or concave ellipsoidal surface
End face.
In the present embodiment, optical fiber 15 is common single-mode fiber or multimode fibre, naturally it is also possible to be photonic crystal fiber
Deng special optical fiber.Wherein, before the end face to optical fiber 15 is processed, it is necessary to peel off the coat of the end, stripping
Length is usually no more than 1cm, then end face to be processed is polished, is cleaned, dry by obtaining the end of smooth optical fiber 15
Face, and then the end face of optical fiber 15 can be processed.
On the basis of above-described embodiment, as shown in Fig. 2 the processing dress of the fiber end face that another embodiment of the present invention is provided
Putting also includes the beam splitter 16 being arranged between tunable laser 10 and spatial filter 11.The beam splitter 16 is used for part
Other parts laser is transmitted through power meter 17 by laser reflection to spatial filter 11；Power meter 17 is used for tunable laser
The power of device 10 is measured, to monitor the stability of output laser, it is ensured that the laser energy of the final end face for focusing on optical fiber 15
The uniformity of amount.
Wherein, beam splitter 16 is half-reflecting half mirror, and its transmission and reflection ratio are 1:1, its material is zinc selenide.Specifically
Ground, laser incides beam splitter 16 with 45 degree of angles, and with 45 degree of angle outgoing.Alternatively, the dividing for BSW710 models of beam splitter 16
Shu Jing, power meter 17 is the power meter of S305C or S314C models, and certainly, the present invention is not limited to this, in other embodiment
In, it would however also be possible to employ other kinds of beam splitter and power meter.Alternatively, the laser that the power meter 17 in the present embodiment is detected
Energy is about 1W~5W.
On the basis of any of the above-described embodiment, as shown in figure 3, another embodiment of the present invention provide fiber end face plus
Frock is put also includes optical system, and the optical system is used to regulate and control the locus of optical fiber 15.Alternatively, the optical system includes
Adjustment platform 18, the first microscope 19, the automatically controlled upset microscope 21 of mirror 20 and second.Adjustment platform 18 is used to clamp and fix optical fiber
15, and, adjustment optical fiber 15 position in a first direction on X and second direction Y, second direction Y is vertical with first direction X；The
One microscope 19 and automatically controlled upset mirror 20 are used to observe position of the optical fiber 15 on second direction Y, to ensure the optical axis of optical fiber 15
With the optical axis coincidence of laser；Second microscope 21 is used to observing position of the optical fiber 15 in a first direction on X, that is, observe optical fiber 15
The distance between focus of end face and the first lens 14.
Specifically, after carrying out peeling off the treatment such as coat to optical fiber 15, optical fiber 15 is clamped and adjustment platform 18 is fixed on
On, then the end face of the optical fiber 15 after fixing utilizes the first microscope 19 and automatically controlled upset mirror 20 towards the incident direction of laser
Position of the observation optical fiber 15 on second direction Y, using the position on the observation of the second microscope 21 optical fiber 15 in a first direction X,
Afterwards using adjusting the adjustment of platform 18 optical fiber 15 position in a first direction on X and second direction Y, with ensure optical fiber 15 optical axis and
The optical axis coincidence of laser beam, it is ensured that the end face of optical fiber 15 is located on the focal plane of the first lens 14.When the space bit of optical fiber 15
Put after the completion of adjustment, automatically controlled upset mirror 20 is removed into light path, and open tunable laser 10, shutter and pendulum mirror etc. to optical fiber 15
End face be processed.
In the present embodiment, adjustment platform 18 is five dimension translation stages, and the five dimensions translation stage includes three-dimensional trim holder and two-dimension adjustment
Frame, additionally, the support of combination one is also needed on the two-dimension adjustment frame is used for grip optical fiber 15.Certainly, the present invention is not limited in
This, in other embodiments, the adjustment platform 18 can also be other kinds of adjustment platform.Alternatively, the three-dimensional trim holder is
The adjustment frame of BMT616D/M models, two-dimension adjustment frame is the adjustment frame of KM100T models, and support is the branch of SM1F1-250 models
Frame；Automatically controlled upset mirror 20 is the upset mirror of 8892-K-M models, and the first microscope 19 and the second microscope 21 are simple microscope,
The object lens of the simple microscope are the big aperture objectives vertically of focal length, and certainly, the present invention is not limited to this.
The processing effect to the end face of optical fiber 15 as a example by presetting spot tracks and be point and straight line is illustrated below.As schemed
Shown in 4, Fig. 4 be single laser pulse hot spot optical fiber 15 end face position view, its light in the end face of optical fiber 15
Spot track is point shaped laser spot, and the shaped laser spot is located at the center of the end face of optical fiber 15.Using the laser pulse pair of the spot tracks
After the end face of optical fiber 15 is processed, the end face of formation is the end face of concave-sphere type, as shown in figure 5, Fig. 5 is the light shown in Fig. 4
Fine 15 along axis schematic cross-section, the radius of curvature of this concave spherical surface bottom is 114 μm.Alternatively, when optical fiber 15 is common
During single-mode fiber, the range of curvature radius that can be obtained is 30 μm -1500 μm.
In the present embodiment, can be by controlling the power of single laser pulse, pulsewidth and focusing on the end face of optical fiber 15
The size of hot spot, controls the radius of curvature of the concave spherical surface of formation.As shown in fig. 6, Fig. 6 swashs for the radius of curvature of concave spherical surface with single
The relation schematic diagram of the changed power of light pulse, with the continuous increase of power, the radius of curvature of concave spherical surface constantly reduces.Need
Illustrate, during the changed power of laser pulse, the pulsewidth of laser pulse need to be kept constant, also need to keep optical fiber 15
End face it is constant with the distance between the first lens 14, that is, ensure optical fiber 15 end face spot size it is constant.
As shown in fig. 7, Fig. 7 be default spot tracks for straight line hot spot optical fiber 15 end face position view, according to
The light spot group of multiple laser pulses of the secondary end face for being transferred to optical fiber 15 is in line the spot tracks of shape.The straight line can by A, B,
Five points of C, D, E are constituted, it is also possible to be made up of ten points of A, B, C, D, E, E, D, C, B, A.Using the laser arteries and veins of the spot tracks
Rush after being processed to the end face of optical fiber 15, the end face of formation is the end face of concave-sphere type.
As shown in figure 8, Fig. 8 is schematic cross-section of the optical fiber 15 shown in Fig. 7 along axis, wherein, I is along concave ellipsoidal surface
Major axis schematic cross-section, corresponding radius of curvature be Rmax=137 μm, II is shown along the section of the short axle of concave ellipsoidal surface
It is intended to, corresponding radius of curvature is Rmin=66 μm, according to formulaThe ellipse of concave ellipsoidal surface can be calculated
Rate is 0.72.
In the present embodiment, can by control the power of multiple laser pulses, pulsewidth, end face focal beam spot size with
And spot tracks shape controls the radius of curvature and ellipticity size of concave ellipsoidal surface.As shown in figure 9, Fig. 9 is concave ellipsoidal surface
The relation schematic diagram that ellipticity changes with laser pulse interval, with the increase of laser pulse space interval, concave ellipsoidal surface ellipticity
Constantly increase.It should be noted that during laser pulse interval is continually changing, power, the number of laser pulse need to be kept
Amount, pulsewidth are certain, also need to keep the distance between the end face and the first lens 14 of optical fiber 15 certain.
Furthermore, it is necessary to explanation, when default spot tracks are circular trace, the fiber end face of formation is concave spherical surface,
When default spot tracks are elliptical path, the fiber end face of formation is concave ellipsoidal surface, and this is no longer going to repeat them.
The processing unit (plant) of the fiber end face that the embodiment of the present invention is provided, the laser that will continuously be exported by impulse generator
The laser pulse of discontinuous output is adjusted to, and makes the pulsewidth of laser pulse to preset pulsewidth, adjusted by direction regulator and swashed
The transmission direction of light pulse, the laser pulse to obtain with default spot tracks, laser pulse by after the first lens focus,
The default spot tracks of the shapes such as point, line, circle or ellipse are formed in fiber end face, it is various such that it is able to fiber end face is processed into
The end face of face type, such as end face of concave spherical surface and concave ellipsoidal surface face type；
Also, by adjusting the power of laser, the default pulsewidth of laser pulse and default spot tracks and the first lens
With the concave spherical surface or concave ellipsoidal surface that fiber end face can be processed into different curvature radius for the distance between optical fiber, so as to expand
The range of application of optical fiber microcavity.
The embodiment of the present invention additionally provides a kind of processing method of fiber end face, is applied to what any of the above-described embodiment was provided
Processing unit (plant), as shown in Figure 10, including：
S101：The laser of continuous output is produced using tunable laser；
S102：Utilization space wave filter filters the high-order transverse mode light in the laser, retains the fundamental transverse mode in the laser
Light；
S103：The laser of the continuous output is converted to the laser pulse of discontinuous output using impulse generator, and
The pulsewidth for making the laser pulse is default pulsewidth；
S104：Utilization orientation adjuster adjusts the transmission direction of the laser pulse, has default spot tracks to obtain
Laser pulse；
S105：Using the first lens by the end face of the focusing laser pulses to the optical fiber, with using with the light
The laser pulse of spot track is processed to the end face of the optical fiber.
When the processing unit (plant) also includes beam splitter and power meter, also include：
It is using the beam splitter by the part laser reflection to the spatial filter, laser described in other parts is saturating
It is incident upon the power meter；
The power of the laser is measured using the power meter.
When the processing unit (plant) also includes optical system, also include：
Regulate and control the locus of the optical fiber using the optical system.
When the optical system includes adjustment platform, the first microscope, automatically controlled upset mirror and the second microscope, using optics
The locus of optical fiber described in system regulation includes：
Using adjustment platform clamping and the fixation optical fiber；
Using first microscope and optical fiber position in a second direction described in the automatically controlled upset sem observation, utilize
Optical fiber position in a first direction described in the second micro- sem observation；
The position of the optical fiber on the first direction and the second direction is adjusted using the adjustment platform, described the
Two directions are vertical with the first direction.
Specifically, before the end face to optical fiber is processed, it is necessary to peel off the coat of the end, the length of stripping
1cm is usually no more than, then end face to be processed is polished, cleaned, dried the end face of the optical fiber for obtaining smooth.
Then, optical fiber is loaded on adjustment platform, using the first microscope and automatically controlled upset sem observation optical fiber in second party
Upward position, using the second micro- sem observation optical fiber position in a first direction, and using adjusting platform adjustment optical fiber the
Position on one direction and second direction, to ensure the optical axis of optical fiber and the optical axis coincidence of laser beam, it is ensured that the end face of optical fiber
On the focal plane of the first lens, i.e. the focus of the first lens falls on the end face of optical fiber.
After the completion of the locus adjustment of optical fiber, automatically controlled upset mirror is removed into light path, open tunable laser, shutter
With pendulum mirror etc., and the power of laser is adjusted to appropriate power, the switching frequency of shutter is adjusted to the first predeterminated frequency,
The swaying direction for putting mirror is adjusted to default swaying direction, the hunting frequency for putting mirror is adjusted to the second predeterminated frequency, afterwards, can
Tuned laser produces the laser of continuous output, spatial filter to filter the high-order transverse mode light in laser, the base in reservation laser
The laser of continuous output is converted to transverse mode light, impulse generator the laser pulse of discontinuous output, and makes the arteries and veins of laser pulse
A width of default pulsewidth, direction regulator adjusts the transmission direction of laser pulse, the laser arteries and veins to obtain with default spot tracks
The end face of focusing laser pulses to the optical fiber is had the laser pulse of spot tracks to use to described by punching, the first lens
The end face of optical fiber is processed.
Wherein, during Laser Processing, also include：Fraction of laser light is reflexed to spatial filter by beam splitter, by it
His fraction of laser light is transmitted through power meter, and power meter is measured to the power of laser, to monitor the stability of output laser, protects
The uniformity of the laser energy of the final end face for focusing on optical fiber of card.
The processing method of the fiber end face that the embodiment of the present invention is provided, the laser that will continuously be exported by impulse generator
The laser pulse of discontinuous output is adjusted to, and makes the pulsewidth of laser pulse to preset pulsewidth, adjusted by direction regulator and swashed
The transmission direction of light pulse, the laser pulse to obtain with default spot tracks, laser pulse by after the first lens focus,
The default spot tracks of the shapes such as point, line, circle or ellipse are formed in fiber end face, it is various such that it is able to fiber end face is processed into
The end face of face type, such as end face of concave spherical surface and concave ellipsoidal surface face type；
Also, by adjusting the power of laser, the default pulsewidth of laser pulse and default spot tracks and the first lens
With the concave spherical surface or concave ellipsoidal surface that fiber end face can be processed into different curvature radius for the distance between optical fiber, so as to expand
The range of application of optical fiber microcavity.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (11)
1. a kind of processing unit (plant) of fiber end face, it is characterised in that including tunable laser and be successively set on it is described can
Spatial filter, impulse generator, direction regulator, the first lens and optical fiber in tuned laser light extraction light path；
The tunable laser is used to produce the laser of continuous output；
The spatial filter is used to filter the high-order transverse mode light in the laser, retains the fundamental transverse mode light in the laser；
The impulse generator is used to be adjusted to the laser of the continuous output laser pulse of discontinuous output, and makes described
The pulsewidth of laser pulse is default pulsewidth；
The direction regulator is used to adjust the transmission direction of the laser pulse, has the laser of default spot tracks to obtain
Pulse；
First lens are used for the end face of the focusing laser pulses to the optical fiber, with using with the default hot spot
The laser pulse of track is processed to the end face of the optical fiber.
2. device according to claim 1, it is characterised in that the spatial filter includes being successively set on described adjustable
The second lens in humorous laser light extraction light path and the shadow shield with through hole；
Second lens are used in the through hole of the Laser Focusing to the shadow shield, described to be filtered by the through hole
High-order transverse mode light in laser, retains the fundamental transverse mode light in the laser.
3. device according to claim 1, it is characterised in that the impulse generator is shutter；The direction regulator
It is pendulum mirror；
The shutter is switched according to the first predeterminated frequency, and the laser of the continuous output is converted into the discontinuous output
Laser pulse；
The pendulum mirror swings according to default swaying direction and the second predeterminated frequency, to adjust the transmission direction of the laser pulse,
And obtain the laser pulse with default spot tracks.
4. device according to claim 3, it is characterised in that also include：
The controller being connected with the shutter and pendulum mirror；
The controller is used to be controlled according to first predeterminated frequency switch of the shutter, according to the default swaying direction
With the swing of the second predeterminated frequency control pendulum mirror；
First predeterminated frequency is equal with second predeterminated frequency.
5. device according to claim 1, it is characterised in that also include：
It is arranged on the beam splitter between the tunable laser and the spatial filter；
The beam splitter is used for the part laser reflection to the spatial filter, and laser described in other parts is transmitted through
Power meter；
The power meter is used to measure the power of the tunable laser.
6. the device according to any one of claim 1 to 5, it is characterised in that also include：
Optical system, the optical system is used to regulate and control the locus of the optical fiber.
7. device according to claim 6, it is characterised in that the optical system includes adjustment platform, the first microscope, electricity
Control upset mirror and the second microscope；
The adjustment platform is used to clamp and fix the optical fiber, and, adjust the optical fiber in the first direction and a second direction
Position, the second direction is vertical with the first direction；
First microscope and the automatically controlled upset mirror are used to observe optical fiber position in this second direction；
Second microscope is used to observe optical fiber position in said first direction.
8. a kind of processing method of fiber end face, it is characterised in that be applied to the processing dress described in any one of claim 1 to 7
Put, including：
The laser of continuous output is produced using tunable laser；
Utilization space wave filter filters the high-order transverse mode light in the laser, retains the fundamental transverse mode light in the laser；
The laser of the continuous output is converted to the laser pulse of discontinuous output using impulse generator, and makes the laser
The pulsewidth of pulse is default pulsewidth；
Utilization orientation adjuster adjusts the transmission direction of the laser pulse, the laser arteries and veins to obtain with default spot tracks
Punching；
Using the first lens by the end face of the focusing laser pulses to the optical fiber, with using swashing with the spot tracks
Light pulse is processed to the end face of the optical fiber.
9. method according to claim 8, it is characterised in that when the processing unit (plant) also includes beam splitter and power meter
When, also include：
Using the beam splitter by the part laser reflection to the spatial filter, laser described in other parts is transmitted through
The power meter；
The power of the laser is measured using the power meter.
10. method according to claim 8, it is characterised in that when the processing unit (plant) also includes optical system, also wrap
Include：
Regulate and control the locus of the optical fiber using the optical system.
11. methods according to claim 10, it is characterised in that when the optical system includes adjustment platform, first micro-
When mirror, automatically controlled upset mirror and the second microscope, the locus for regulating and controlling the optical fiber using optical system includes：
Using adjustment platform clamping and the fixation optical fiber；
Using first microscope and optical fiber position in a second direction described in the automatically controlled upset sem observation, using described
Optical fiber position in a first direction described in second micro- sem observation；
Position of the optical fiber on the first direction and the second direction, the second party are adjusted using the adjustment platform
To vertical with the first direction.
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| CN110581432A (en) * | 2019-10-08 | 2019-12-17 | 中国科学技术大学 | Optical fiber microcavity based on ellipsoidal cavity surface, laser and optical fiber preparation method |
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| CN114101905A (en) * | 2021-12-01 | 2022-03-01 | 深圳市紫宸激光设备有限公司 | Laser welding equipment with adjustable light source |
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