CN108963740B - A kind of plate solid laser pumping gain module - Google Patents
A kind of plate solid laser pumping gain module Download PDFInfo
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- CN108963740B CN108963740B CN201810745950.5A CN201810745950A CN108963740B CN 108963740 B CN108963740 B CN 108963740B CN 201810745950 A CN201810745950 A CN 201810745950A CN 108963740 B CN108963740 B CN 108963740B
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- laser medium
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- shaped laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094038—End pumping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0405—Conductive cooling, e.g. by heat sinks or thermo-electric elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The present invention relates to a kind of plate solid lasers to pump gain module, belongs to laser technology field.All sides of pump light source of the present invention from the cross section of lath-shaped laser medium are incident, to make pump light distribution and oscillation light inside lath-shaped laser medium that can realize higher pattern match degree on the two-dimensional directional of cross section.The present invention carries out symmetrical annular pump from four faces of lath-shaped laser medium not light passing using VCSEL, non-pumped region on four faces carries out conduction cooling, on the basis of holding plate strip laser medium excellent heat dispersion performance, it is pumped using tetragonal symmetry, make the oscillation light and pump light pattern match degree height in lath-shaped laser medium, simultaneously, segmented pumps so that along laser transmission direction temperature gradient in cyclically-varying inside lath-shaped laser medium, to effectively eliminate the thermal lensing effect of lath-shaped laser medium.
Description
Technical field
The present invention relates to a kind of plate solid lasers to pump gain module, belongs to laser technology field.
Background technique
In solid state laser, compared to traditional circle rod-shaped laser medium, lath-shaped laser medium is due to its side energy
It enough realizes excellent heat dissipation, thermal lens and thermal birefringence effect can be effectively reduced, to realize that high light beam quality exports quilt
Research extensively.
The common pump mode of lath-shaped laser medium mainly has end face, side, big face-pumping and angle pumping.
In these pump modes, in addition to the pumping of angle, in other pump paving modes, slab laser lath-shaped laser medium is
Hexahedron structure, wherein two faces are light pass surface, at least one face is cooling surface, and therefore, pump face is up to three face (works
In journey practice, pump face is usually a face or two opposite parallel surfaces).And the pumping in one or two faces, swash in lath-shaped
The pumping band formed inside optical medium, can be only formed the Gaussian Profile in one-dimensional square, it is difficult to the oscillation with bidimensional Gaussian Profile
Light forms good pattern match, and therefore, there is some difference for the beam quality in the usual both direction of such slab laser.
Angle is pumped, is that the seamed edge of the slab laser lath-shaped laser medium of hexahedron structure is subjected to chamfering, is pumped from chamfering incidence
Pu light, which improves pump power density and one-dimensional pumping homogeneity to a certain extent, but equally cannot achieve
The good model of two-dimensional direction matches.
Summary of the invention
Mesh technology of the invention solves the problems, such as: overcome the deficiencies in the prior art, proposes a kind of plate solid laser pump
Pu gain module.
The technical solution of the invention is as follows:
A kind of plate solid laser pumping gain module, the pumping gain module include pumping source, lath-shaped laser Jie
Matter, pumping source are heat sink and laser medium is heat sink；
The pumping source is semiconductor vertical cavity surface emitting laser (VCSEL)；
The lath-shaped laser medium is a hexahedron, there are two opposite face is light pass surface in hexahedron, other four
A face is non-light pass surface, defines four faces as the hexahedral side, which is divided into n weight in the axial direction
Multiple unit, each repetitive unit are formed one week in the hexahedral side；Each repetitive unit is divided into cooled region and pumping area
Domain, the length of pumped region is consistent with the luminous section length of pumping source in each repetitive unit；N is natural number, and n is not less than 2；
The pumping source is placed into the pumped region on lath-shaped laser medium, for carrying out to lath-shaped laser medium
Irradiation, and the light-emitting surface of pumping source is parallel with lath-shaped laser medium surface；
The laser medium is heat sink to be placed into cooled region on lath-shaped laser medium, for being situated between to lath-shaped laser
Matter is cooled down；
The pumping source is heat sink for cooling down to pumping source；
Hexahedral two light pass surfaces can be vertical with side, can also be in other 0-90 ° of any angle；
The hexahedral cross-sectional aspect may be the same or different；
The lath-shaped laser medium, along lath-shaped laser medium length direction, internal temperature is in the period point
Cloth.
Beneficial effect
(1) all sides of pump light source of the present invention from the cross section of lath-shaped laser medium are incident, so that lath-shaped be made to swash
Pump light distribution and oscillation light can realize higher pattern match degree on the two-dimensional directional of cross section inside optical medium.This
Invention carries out symmetrical annular pump from four faces of lath-shaped laser medium not light passing using VCSEL, non-on four faces
Pumped region carries out conduction cooling, on the basis of holding plate strip laser medium excellent heat dispersion performance, is pumped using tetragonal symmetry
Pu makes oscillation light and pump light pattern match degree height in lath-shaped laser medium, meanwhile, segmented pumps so that lath-shaped swashs
Along laser transmission direction temperature gradient in cyclically-varying inside optical medium, to effectively eliminate the heat penetration of lath-shaped laser medium
Mirror effect；
(2) pumping gain module of the invention uses segmented pumping configuration, which is by the pumping source of surface launching point
At 4 one group, periodic segments are placed on along the length direction of lath-shaped laser medium, and every group of 4 pumping sources are put respectively
It sets on the outside of 4 sides of lath-shaped laser medium, pumping is irradiated to lath-shaped laser medium.In lath-shaped laser medium
Each side on, be segmented the VCSEL of placement and well thermally contacted with the heat sink formation of pumping source.In the length along lath-shaped laser medium
It spends on direction, except pumped region interval and region, placement laser medium is heat sink to form good heat with lath-shaped laser medium
Contact, radiates to lath-shaped laser medium.The size of pumped region depends on lath-shaped laser medium size and VCSEL core
The indexs such as piece surface of emission size, launch angle should specifically make pump light full of lath-shaped laser medium cross section, while meeting and swashing
The pump power demand of light device and the radiating requirements of lath-shaped laser medium.The pumped region size of space depends on chip electrode ruler
Very little and radiating requirements specifically should shorten as far as possible interval under the premise of guaranteeing that the heat dissipation of lath-shaped laser medium is good, to avoid plate
When strip laser medium is too long, the flatness that lath-shaped laser medium is heat sink is bad to lead to lath-shaped laser medium internal stress mistake
Greatly.The module makes pump light, and lath-shaped laser is symmetrically incident on four sides around on slab laser lath-shaped medium cross-section
Media interior is incident on inside lath-shaped laser medium along the segmentation of lath-shaped laser medium length direction, this side up, pumping
It is interregional every and region except, radiate to lath-shaped laser medium.
(3) present invention is by carrying out four face-pumpings to lath-shaped laser medium, so as to avoid traditional lath pump mode
In, only have the problem of one-dimensional square and oscillation light pattern match caused by single or double pumping, oscillation light and pump light is made to exist
All matched well on two-dimensional directional can make to export the beam quality of laser in two directions more consistent；The present invention passes through
In the mode that lath-shaped laser medium pumping interval region radiates, with the cooling club-shaped solid laser device pumping side of Conventional conduction
Formula is compared, and is maintained slab laser and is radiated good feature, reduces the problems such as thermal stress is birefringent；
(4) present invention pumping area along lath-shaped laser medium length direction is spaced apart with radiating area, to make to vibrate
Laser, can be by the temperature field of mechanical periodicity, to compensate for the heat penetration of lath-shaped laser medium well in transmission direction
Mirror effect, and then promote beam quality.The present invention is compared with other slab laser pump modes, and pumping source laser is without whole
Shape, overall structure is simple, high reliablity.
(5) present invention proposes a kind of applied to plate solid laser, using semiconductor vertical cavity surface emitting laser
(VCSEL) gain module is pumped as the tetragonal symmetry annular segments formula of pumping source.The program uses VCSEL from slab laser plate
Four faces of strip laser medium not light passing carry out symmetrical annular pump, and the non-pumped region on four faces conduct cold
But.Compared to traditional pumping configuration, which makes lath-shaped on the basis of keeping lath laser medium excellent heat dispersion performance
Pump light and oscillation light realize higher matching degree inside laser medium.On this basis, segmented pumps so that lath-shaped swashs
Optical medium internal temperature field is in cyclically-varying along laser transmission direction, to can effectively eliminate plate during laser transmission
The thermal lensing effect of Laser Slabs strip laser medium.To improve the beam quality of output laser and its in X, Y both direction
On consistency (using beam Propagation direction as Z axis, X, Y meet the right-hand rule).
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pumping gain module of the invention；
Fig. 2 is the cross-sectional view of pumping gain module of the invention；
Fig. 3 is the distribution schematic diagram of cooled region and pumped region on lath-shaped laser medium of the invention；
Fig. 4 is the distribution schematic diagram of internal pump light on lath-shaped laser medium of the invention；
Fig. 5 is internal pump light distribution Gauss curve fitting schematic diagram on lath-shaped laser medium of the invention；
Fig. 6 is longitudinal (Z-direction) Temperature Distribution schematic diagram inside lath-shaped laser medium of the invention；
Wherein, 1- lath-shaped laser medium, 2- laser medium is heat sink, and 3- pumping source is heat sink, 4- pumping source；
Specific embodiment
Fig. 1 is the overall configuration figure that slab laser of the present invention pumps gain module, and Fig. 2 is that pump module of the present invention is lateral
Sectional view.Gain module includes slab laser lath-shaped laser medium 1, slab laser lath-shaped laser medium is heat sink 2 and pump
Pu source is heat sink 3 and pumping source 4.
1 light pass surface surface of slab laser lath-shaped laser medium is coated with the anti-reflection film to oscillation light, remaining four face feather plucking
Processing can be used gold-plated so as to using indium weldering reduction thermal resistance with heat sink contact position.Slab laser lath-shaped laser medium
Light pass surface is not limited to vertical with side, and also cleavable is 0-90 ° of angle of Brewster's angle or other angles, and lath-shaped laser medium is horizontal
Section length and width be not limited to it is identical, can for difference.
The arranging plate strip laser medium heat sink 2 on the outside of lath-shaped laser medium, specific configuration is shown in Fig. 3, heat sink along length
On direction, by some cycles hollow design, be fixed on the outside of lath-shaped laser medium, and with four sides of lath-shaped laser medium
Form good thermo-contact.This is heat sink to be independent overall structure, can also have 2 or more parts to be composed, this implementation
It is made of in example 2 pieces of splits, in assembly, mosaic need to take appropriate measure to guarantee good thermo-contact.
It first welds or is crimped at regular intervals on pumping source heat sink 3 in VCSEL semiconductor laser pumping source 3, it is desirable that pumping
Source is well thermally contacted with the heat sink formation of pumping source.Pumping source position should be opposite with the hollow out position that lath-shaped laser medium is heat sink
Answer, after fixing rear pumping source, by the pumping source for being equipped with pumping source it is heat sink merge with heat sink group of lath-shaped laser medium to be formed
Good thermo-contact.
Sequence completes the installation combination of other three sides.
Embodiment
As depicted in figs. 1 and 2, a kind of plate solid laser pumps gain module, which includes pumping
Source 4, lath-shaped laser medium 1, pumping source is heat sink 3 and laser medium heat sink 2；
The pumping source 4 is semiconductor vertical cavity surface emitting laser (VCSEL)；
The lath-shaped laser medium 1 is the cuboid that cross section is square, having a size of 5mm × 5mm × 65mm；End
Face is light pass surface, and Z-direction is oscillation light direction of beam propagation, remaining four face is side, and end face is vertical with side.Light pass surface table
Face is coated with the anti-reflection film to oscillation light, remaining four face feather plucking processing.
As shown in figure 3, the side of the laser medium is divided into 6 repetitive units in the axial direction, each repetitive unit swashs at this
The side of optical medium is formed one week；Each repetitive unit is divided into cooled region and pumped region, pumping area in each repetitive unit
The length in domain is consistent with the luminous section length of pumping source, is 4.8mm；Cooled region is also 4.8mm.
The design heat sink size of laser medium matches with laser medium, and forms good heat by heat sink with laser medium and connect
Touching, when necessary, can also be gold-plated on laser medium, in order to which heat sink welding is to further decrease thermal resistance, heat radiation performance.
The laser medium is heat sink to be placed into cooled region on lath-shaped laser medium, heat sink right in laser medium
It answers the part of lath-shaped laser medium pumped region to carry out hollow design, pumping source laser is made to be incident on lath-shaped from hollow-out part
On laser medium.
Computer sim- ulation, pump light distribution on laser medium cross section are carried out to pump light distribution inside lath-shaped laser medium
As shown in figure 4, carrying out the fitting of basic mode Gaussian lineshape to distribution curve, as shown in Figure 5.It is seen that in laser medium
Pump light distribution is identical in X, Y both direction, and higher with basic mode Gaussian lineshape degree of fitting.
To lath-shaped laser medium internal temperature carry out computer sim- ulation, it can be deduced that its interior temperature distribution as shown in fig. 6,
For periodic distribution.Resonant cavity is built using above-mentioned pumping gain module, is had through actual test quality for outputting laser beam larger
It is promoted, it was demonstrated that Temperature cycling distribution is preferable to thermal lens technique；And beam quality is more one on X, Y both direction
It causes, it was demonstrated that have certain promotion compared to the pattern match of traditional lath-shaped pumping gain module.
Claims (13)
1. a kind of plate solid laser pumps gain module, it is characterised in that: the pumping gain module includes lath-shaped laser
Medium, lath-shaped laser medium be a hexahedron, define hexahedron in there are two opposite face be light pass surface, other four faces are
Non- light pass surface, four non-light pass surfaces are divided into several repetitions as the hexahedral side, the hexahedral side in the axial direction
Unit, each repetitive unit are divided into cooled region and pumped region；
Four sides of lath-shaped laser medium are pumped；
It is heat sink on along its length, by some cycles hollow design, be fixed on the outside of lath-shaped laser medium, and and lath-shaped
Four sides of laser medium form good thermo-contact；
Pumping source position should be corresponding with the hollow out position that lath-shaped laser medium is heat sink, so as to form corresponding cooled region and
Pumped region.
2. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: each to repeat list
Member is formed one week in the hexahedral side.
3. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: each to repeat list
The length of pumped region is consistent with the luminous section length of pumping source in member.
4. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: repetitive unit
Number is n, and n is natural number, and n is not less than 2.
5. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: hexahedral two
A light pass surface is vertical with side.
6. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: hexahedral two
A light pass surface and side out of plumb.
7. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: hexahedral cross
Section length and width are identical.
8. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: hexahedral cross
Section length and width are not identical.
9. a kind of plate solid laser according to claim 1 pumps gain module, it is characterised in that: the pumping gain
Module further includes pumping source, pumping source is heat sink and laser medium is heat sink.
10. a kind of plate solid laser according to claim 9 pumps gain module, it is characterised in that: the pump
Pu source is placed into the pumped region on lath-shaped laser medium, for being irradiated to lath-shaped laser medium, and pumping source
Light-emitting surface is parallel with lath-shaped laser medium surface.
11. a kind of plate solid laser according to claim 9 pumps gain module, it is characterised in that: described swashs
Optical medium is heat sink to be placed into cooled region on lath-shaped laser medium, for cooling down to lath-shaped laser medium.
12. a kind of plate solid laser according to claim 9 pumps gain module, it is characterised in that: the pump
Pu source is heat sink for cooling down to pumping source.
13. a kind of plate solid laser according to claim 9 pumps gain module, it is characterised in that: the pump
Pu source is semiconductor vertical cavity surface emitting laser.
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| CN201810745950.5A CN108963740B (en) | 2018-07-09 | 2018-07-09 | A kind of plate solid laser pumping gain module |
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| CN108963740B true CN108963740B (en) | 2019-08-09 |
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| CN109713556B (en) * | 2019-01-15 | 2020-12-22 | 西安中科洺光测控技术有限公司 | High-power small-size no water cooling side pump lath laser device |
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| US6134258A (en) * | 1998-03-25 | 2000-10-17 | The Board Of Trustees Of The Leland Stanford Junior University | Transverse-pumped sLAB laser/amplifier |
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