CN104362502B - A kind of high power activation speculum of zero thermal lensing effect - Google Patents
A kind of high power activation speculum of zero thermal lensing effect Download PDFInfo
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- CN104362502B CN104362502B CN201410648387.1A CN201410648387A CN104362502B CN 104362502 B CN104362502 B CN 104362502B CN 201410648387 A CN201410648387 A CN 201410648387A CN 104362502 B CN104362502 B CN 104362502B
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- high power
- speculum
- thermal lensing
- lensing effect
- gain medium
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Abstract
Speculum is activated the present invention relates to a kind of high power of zero thermal lensing effect, including：Multigroup rotating disk (3) for being uniformly provided with perforate, rotating shaft (9) around center rotates, it is arranged in perforate, place the cellular glass or ceramics (4) of gain medium (2), the pumping source (1) being connected with gain medium (2), is encapsulated in the carborundum plectane (6) of rotating disk (3) outer surface.Compared with prior art, the present invention greatly reduces thermal lensing effect when high power laser light works, and can obtain the more preferable high power laser light of beam quality, and the activation speculum is generally used for amplifying the pulsed light of different frequency, thus can obtain the pulse of high-energy.
Description
Technical field
The present invention relates to solid state laser field, reflection is activated more particularly, to a kind of high power of zero thermal lensing effect
Mirror.
Background technology
In the last few years, Solid State Laser achieved fast development.Power output, optical conversion efficiencies and beam quality have
Large increase.But, fuel factor hinders the development of superpower laser to a certain extent.Solid state laser can be obtained very
High power output, but beam quality is bad.The beam quality of optical fiber laser is fine, but the output energy of simple optical fiber
Simply in a MJ order of magnitude.According to the difference of gain medium shape, it can substantially be divided into shaft-like (or optical fiber) laser, thin slice
Laser and slab laser.Although shape difference, general principle is all similar.Gain medium by pumping when
Wait, heat can be produced in quantum defect, medium due to existing in gain media.These heats are with heat transfer, thermal convection current or hot spoke
The mode penetrated is transmitted into surrounding environment from the surface of gain media.Due to the presence of hot-fluid, thermograde can be produced.Temperature ladder
Degree can cause a series of relevant fuel factors, such as thermal lensing effect, the birefringence that hot pressing is produced, thermal deformation etc..Fuel factor
In the presence of the wavefront of laser light wave can be changed, so as to reduce beam quality and optical conversion efficiencies.No matter which kind of gain we choose
Medium, the light wave wavefront distortion that fuel factor is produced is to avoid, and can only be reduced as far as possible.
Chinese patent CN104051940A discloses air cooling high-average power combined type activation mirror structure laser amplifier
Device, includes the double amplification modules of structure identical of the M opposing parallel arrangements that interlock, and each double amplification modules are answered by rectangle frame, N blocks
Box-like sheet gain media, helium, diode laser matrix, the block combined sheet gain medias of N have different doping concentrations
And length, outwards coaxially it is arranged in rectangle frame, each piece of gain media length L and mixes successively from the straight flange of rectangle frame from short to long
Miscellaneous concentration t product is equal, and the upper oblique frame of rectangle frame and oblique frame have fluid circulation channel, the fluid circulation channel with it is described
The corresponding interval of N block gain medias be equipped with cooling circulation port, circulated for helium between gain media.Because this is special
The gain media being placed in parallel in each module in profit is not of uniform size, and easily generation pumping is uneven, so that can not be effectively
Extract energy.And the influence of external force, gain media edge and rectangle frame contact are not accounted for when gain media is placed
The pressure that produces of place and the gravity of gain media can cause the distortion before laser wave.In addition, cooling path it is long so that
It is even to the inhomogeneous cooling of gain media, produce the thermograde of transverse direction and the longitudinal temperature difference of gain media front-back.It is laterally warm
Degree gradient can cause thermal lensing effect, and longitudinal temperature difference can cause gain media to occur thermal deformation.And each module in this patent
The circular gain media of very thin monolithic is used, pumping will not be produced uneven.Gain media edge annular soft material
Encase, external force can be eliminated.Periodically uniform pumping and double-faced uniform cooling can eliminate Transverse Temperature Gradient and longitudinal temperature
Difference, and pump energy can be fully extracted, so as to obtain the more preferable high power laser light output of beam quality.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind results in high energy
The high power activation speculum of zero thermal lensing effect of thermal lensing effect when measuring pulse, reduction high power laser light work.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of high power activation speculum of zero thermal lensing effect, including：
The rotating disk of perforate is uniformly provided with, the rotating shaft around center rotates,
It is arranged in perforate, places the cellular glass or ceramics of gain medium,
The pumping source being connected with gain medium,
It is encapsulated in the carborundum plectane of rotating disk outer surface.
Described pumping source is the continuous laser diode of uniform pumping, prevents gain medium due to transverse temperature ladder
Thermal lensing effect produced by degree.Pumping source is cooled down in cooled plate, and temperature control is at 20 DEG C, using profile pump, from two poles
The vertical pumping laser gain media of light in pipe out.
Depending on the wavelength that pumping source is selected is according to selected gain medium.If thulium doped Tricationic is situated between
Matter, is typically chosen 793 nanometers of laser diode.If the Tricationic of doping ytterbium, 940 nanometers of laser is typically chosen
Diode.The power continuously adjustabe of pumping source.
Described gain medium is thin rounded flakes gain media, has high-absorbility to pump wavelength, and laser increases
The back side of beneficial medium is coated with the film to pump wavelength with high reflectance, and the thickness of gain medium is on 0.5 millimeter of left side
The right side, a diameter of 2 cm, gravity can be ignored.
Described disk diameter is 120 millimeters, and thickness is 0.5 millimeter.It is 1.1 centimetres that several radiuses have been beaten on rotating disk
Aperture, for placing gain media and porous ring-shaped glass or ceramics, rotating disk is disposed vertically.
Described cellular glass or ceramics, is the soft material of ring-type, is entangled on gain medium and embedded rotating disk
In perforate, inside radius is 1 centimetre, and outer radius is 1.1 centimetres, and thickness is 0.5 millimeter, for entangling thin rounded flakes and embedded rotating disk
Upper radius prevents the deformation band of gain medium from coming in 1.1 centimetres of aperture, the external force suffered by such gain media is zero
Light wave front-distortion.
Described cellular glass or ceramics is also filled with the helium of uniform cooling gain medium.
Described rotating shaft connection driving machine, driving rotating disk periodic rotary, by the rotating speed or rotation period that change rotating disk
Amplify the pulse laser of different frequency.
Compared with prior art, the present invention greatly reduces thermal lensing effect when high power laser light works, and can obtain
The more preferable high power laser light of beam quality, the activation speculum is generally used for amplifying the pulsed light of different frequency, thus can obtain
Obtain the pulse of high-energy.The Transverse Temperature Gradient of gain medium can produce the change of refractive index in the application, so as to produce
Thermal lensing effect.Thermal lensing effect can produce infringement by Laser Focusing into a point to gain media.So in Laser Experiments
In, especially in high power laser light experiment, thermal lensing effect must try to reduction or even eliminate.This patent can be solved well
Above-mentioned thermal lensing effect problem.By the way that to gain media, periodically uniform pumping and double-faced uniform are cooled down so that gain is situated between
The Transverse Temperature Gradient approximate zero of matter, so that thermal lensing effect is also almost nil.Beam quality is produced in order to eliminate pressure simultaneously
Raw influence, has selected the negligible thin rounded flakes gain media of gravity and for eliminating gain media edge pressure
Soft porous material.Zero thermal lensing effect and zero external force cause the laser to result in the more preferable Gao Gong of beam quality
Rate, the output of high pulse energy laser.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the structural representation of single aperture on rotating disk.
Fig. 3 is the structural representation of single rotating disk.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
A kind of high power activation speculum of zero thermal lensing effect, its structure is as shown in figure 1, including pumping source 1, circle is thin
Piece (thickness be 0.5 millimeter) gain medium 2, places the rotating disk 3 of gain medium 2, soft cellular glass or
Ceramics 4, carborundum plectane 6, rotating shaft 9 etc..Pulse light from signal source 8 out, with certain incidence in X-Z plane
Angle is transmitted, multiple reflections and amplification by gain medium 2, finally realizes that high power laser light is exported.
Pumping source 1 is the continuous laser diode of uniform pumping, prevents gain medium by Transverse Temperature Gradient institute
The thermal lensing effect of generation.Pumping source is cooled down in cooled plate, and temperature control is at 20 DEG C, using profile pump, from diode
The vertical pumping laser gain media 2 of light out.Depending on the wavelength of selection is according to selected gain medium 2.If mixing
The Tricationic medium of miscellaneous thulium, is typically chosen 793 nanometers of laser diode.If the Tricationic of doping ytterbium, one
As 940 nanometers of laser diode of selection.The power continuously adjustabe of pumping source 1.Signal source 8 is pulsed light, and pulsewidth is received to be several
Second.When the activation speculum normal work, flashlight is with certain incidence angle, incident first rotating disk.Pump light is then
Profile pump, it is more simple in construction than end pumping, and also conversion efficiency is higher.The rotation week of rotating disk is can adjust by driving machine 7
Phase, and then the pulsed light of different frequency can be amplified.Because the structure is made up of multiple rotating disks, incident pulsed light is through rotating disk
Constantly amplification and reflection, is finally output as high energy pulse one by one.
The gain medium 2 used has high-absorbility to pump wavelength for thin rounded flakes gain media, and laser increases
The back side of beneficial medium 2 is coated with the film to pump wavelength with high reflectance, and the thickness of gain medium 2 is at 0.5 millimeter
Left and right, a diameter of 2 cm, gravity can be ignored.A diameter of 120 millimeters of rotating disk 3, thickness is 0.5 millimeter.Turning
The aperture that several radiuses are 1.1 centimetres is beaten on disk 3, for placing gain medium 2 and porous ring-shaped glass or ceramics
4, rotating disk 3 is disposed vertically.
Cellular glass or ceramics 4 are the soft material of ring-type, entangle the perforate on gain medium 2 and embedded rotating disk 3
In, inside radius is 1 centimetre, and outer radius is 1.1 centimetres, and thickness is 0.5 millimeter, for entangling thin rounded flakes and embedded rotating disk upper half
Footpath is in 1.1 centimetres of aperture, the external force suffered by such gain medium 2 is zero, prevents the deformation band of gain medium 2
Carry out light wave front-distortion.In addition, it is also filled with the uniform helium 5 for cooling down gain medium 2 in cellular glass or ceramics 4.
Rotating shaft 9 connects driving machine, and the periodic rotary of driving rotating disk 3 amplifies different frequency by the rotating speed or rotation period that change rotating disk 3
Pulse laser.
Fig. 2 is the structural representation of single aperture on rotating disk, as can be seen from Figure, and the laser gain of thin rounded flakes shape is situated between
Matter 2 is encased by the cellular glass or ceramics 4 of ring-type, is embedded in the aperture opened up on rotating disk 3.
Fig. 3 is the structure chart of single rotating disk laser.There is the gain medium 2 of many disc-shapeds on rotating disk 3.It is soft
Ring-shaped material be used for eliminating external force suffered by disk.Because rotating disk 3 is placed vertically, turn clockwise, colder helium (He)
In lower section, this region is cooling zone.The top of rotating disk is pumped region.It is most upper when pumping pulse and signal pulse are beaten
One disk of side is in mode of operation, and pulsed light is amplified.When pulse is by disk, a disk on side is gone to
The operating position, prepares amplification next pulse.And previous disk recovers pump then after uniform cooling after a while
State before Pu.So move in circles.
Claims (7)
1. a kind of high power activation speculum of zero thermal lensing effect, it is characterised in that including：
Multigroup rotating disk (3) for being uniformly provided with perforate, the rotating shaft (9) around center rotates,
It is arranged in perforate, places the cellular glass or ceramics (4) of gain medium (2),
The pumping source (1) being connected with gain medium (2),
It is encapsulated in the carborundum plectane (6) of rotating disk (3) outer surface；
Described pumping source (1) is the continuous laser diode of uniform pumping, prevents gain medium (2) due to transverse temperature
Thermal lensing effect produced by gradient, the pumping source (1) is cooled down in cooled plate, and temperature control is at 20 DEG C, using profile pump,
The vertical pumping laser gain media (2) of light from diode out.
2. the high power activation speculum of a kind of zero thermal lensing effect according to claim 1, it is characterised in that described
Gain medium (2) is thin rounded flakes gain media, has high-absorbility to pump wavelength, gain medium (2)
The back side is coated with the film to pump wavelength with high reflectance.
3. the high power activation speculum of a kind of zero thermal lensing effect according to claim 1, it is characterised in that described
Rotating disk (3) is disposed vertically.
4. the high power activation speculum of a kind of zero thermal lensing effect according to claim 1, it is characterised in that described
Cellular glass or ceramics (4), are the soft material of ring-type, entangle the perforate on gain medium (2) and embedded rotating disk (3)
In, prevent the deformation band of gain medium (2) from carrying out light wave front-distortion.
5. the high power activation speculum of a kind of zero thermal lensing effect according to claim 1, it is characterised in that described
Cellular glass or ceramics (4) are also filled with the helium of uniform cooling gain medium (2).
6. the high power activation speculum of a kind of zero thermal lensing effect according to claim 1, it is characterised in that described
Rotating shaft (9) connects driving machine, driving rotating disk (3) periodic rotary.
7. the high power activation speculum of a kind of zero thermal lensing effect according to claim 1, it is characterised in that change and turn
The rotating speed or rotation period of disk (3) amplify the pulse laser of different frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648387.1A CN104362502B (en) | 2014-11-14 | 2014-11-14 | A kind of high power activation speculum of zero thermal lensing effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648387.1A CN104362502B (en) | 2014-11-14 | 2014-11-14 | A kind of high power activation speculum of zero thermal lensing effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104362502A CN104362502A (en) | 2015-02-18 |
| CN104362502B true CN104362502B (en) | 2017-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410648387.1A Expired - Fee Related CN104362502B (en) | 2014-11-14 | 2014-11-14 | A kind of high power activation speculum of zero thermal lensing effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106938370B (en) * | 2015-12-30 | 2019-12-24 | 上海微电子装备（集团）股份有限公司 | Laser processing system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2200240Y (en) * | 1994-08-11 | 1995-06-07 | 华中理工大学 | Rotor disc for laser modulation |
| US7548573B2 (en) * | 2005-07-12 | 2009-06-16 | Santanu Basu | Rotary disk, rotary disk module, and rotary disk laser and amplifier configurations |
| CN104037609A (en) * | 2014-06-16 | 2014-09-10 | 中国飞机强度研究所 | Pulse laser beam producing device |
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| CN104362502A (en) | 2015-02-18 |
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