CN109586152A - Pumping configuration for high power glancing incidence slab laser beamquality improvement - Google Patents
Pumping configuration for high power glancing incidence slab laser beamquality improvement Download PDFInfo
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- CN109586152A CN109586152A CN201910049863.0A CN201910049863A CN109586152A CN 109586152 A CN109586152 A CN 109586152A CN 201910049863 A CN201910049863 A CN 201910049863A CN 109586152 A CN109586152 A CN 109586152A
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- pump light
- horizontal direction
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- pump
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- 238000005086 pumping Methods 0.000 title claims abstract description 34
- 230000006872 improvement Effects 0.000 title claims abstract description 19
- 238000003384 imaging method Methods 0.000 claims abstract description 17
- 230000004075 alteration Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 241001270131 Agaricus moelleri Species 0.000 description 3
- 230000007850 degeneration Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 241000931526 Acer campestre Species 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 210000003746 feather Anatomy 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 2
- -1 Nd:YVO4 Chemical compound 0.000 description 1
- 229910017502 Nd:YVO4 Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H01S3/094049—Guiding of the pump light
-
- 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
- H01S3/09—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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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of pumping configurations for high power glancing incidence slab laser beamquality improvement, waveguide, imaging system are homogenized including pump light source, coupled system, horizontal direction, wherein: the pump light source issues pump light, is coupled into the horizontal direction through the coupled system and homogenizes waveguide；The horizontal direction homogenizes after waveguide homogenizes the horizontal direction of pump light, is input to the imaging system；Horizontal direction is homogenized the pump light at waveguide outlet and is imaged in pump face by the imaging system, is distributed intensity distribution of the pump light in pump face unanimously with the pump light intensities homogenized at waveguide outlet in the horizontal direction.The present invention is simple and reliable, and cost is relatively low, and is easily achieved, and is the splendid approach for realizing high power and high beam quality glancing incidence slab laser.
Description
Technical field
The present invention relates to laser technology fields, are used for high power glancing incidence slab laser light more particularly, to one kind
The pumping configuration that beam quality improves.
Background technique
Solid state laser has many advantages, such as that high brightness, high efficiency, compact-sized, performance is stable, long-life and all solidstate,
There is important application in the fields such as material processing, medical treatment, scientific research, military affairs.In high power solid state laser, fuel factor meeting
The stability for influencing laser, reduces the beam quality and efficiency of laser.Fuel factor is difficult to high-power bar-shaped laser
Realize high light beam quality.Slab laser has big area-volume ratio, good heat dissipation effect, it is easy to accomplish high power laser light is defeated
Out.But common slab laser is difficult to realize preferable pattern match ratio between pump light and laser, laser extracts effect
Rate is lower.In glancing incidence battened construction, pump light is absorbed near pump face by gain media strongly, laser with low-angle plunder into
It is mapped to pump face and inner total reflection occurs, splendid pump light can be obtained and match ratio with zlasing mode.The structure is to realize height
The effective means of power and high efficiency solid state laser.But research shows that: when high power pump, glancing incidence battened construction
In effect of end surface it is very serious, will cause laser beam quality degeneration at work, degenerate and occur mainly in the level of lath
Direction (as shown in Figure 6).The degeneration of laser beam quality is by the thermotropic variations in refractive index and lath pumping end surface on laser optical path
Stress deformation cause.Wherein, the stress deformation of pump face horizontal direction is the principal element for causing laser beam quality to be degenerated.
This is because optical path difference caused by the stress deformation of horizontal direction end face is about lath on laser optical path in glancing incidence battened construction
The 2n/sin θ times of Z-direction end face stress deformation is (as shown in fig. 6, DEFor the strain of Z-direction, then as caused by the stress deformation of end face
Horizontal direction optical path difference is about 2nDE/ sin θ, n are lath refractive index, and θ is glancing incidence angles).That is, with perpendicular to pump
The laser of Pu face incidence is compared, and optical path difference caused by the end face stress deformation (horizontal direction) in glancing incidence battened construction is amplified
Tens times (glancing incidence angles are about between 5 ~ 10 degree), the stress deformation of pump face (laser inner total reflection face) horizontal direction
The principal element degenerated as laser beam quality.
Currently, researcher takes two methods mainly to reduce end face stress deformation to the shadow of laser beam quality
It rings.K. Nawata et al. grips mirror using phase altogether and compensates to beam quality, reduces end face stress deformation to laser beam matter
The influence of amount.M. Abe et al. is bonded one piece of sapphire in pumping end surface the influence of end face stress deformation is effectively reduced.
Introducing phase grips mirror altogether can be effectively reduced influence of the end face stress deformation to laser beam quality, improve laser light
Beam quality, but this can make system become complicated, laser cost greatly improves.And phase grips the limited aperture of mirror altogether and is difficult to reality
Existing high power laser light output.
It is bonded the end face stress deformation that the crystal that undopes can effectively cool down lath and reduce by half item in lath pump face, but
It is technical matters complexity, difficulty is larger, and impracticable.
Summary of the invention
The present invention in order to overcome at least one of the drawbacks of the prior art described above, provides a kind of for high power glancing incidence plate
The pumping configuration that laser beam quality improves.
Primary and foremost purpose of the invention is the improvement realized to high power glancing incidence slab laser beam quality.
In order to solve the above technical problems, technical scheme is as follows:
A kind of pumping configuration for high power glancing incidence slab laser beamquality improvement, pump light is through the pumping configuration
Glancing incidence structure lath is input to after processing, the face that the glancing incidence structure lath is used to receive pump light is pump face, to plunder
Incidence structure lath, gain media can be highly doped Nd vanadate (such as Nd:YVO4, Nd:GdVO4And Nd:GdxY1−xVO4
Deng), highly doped Yb crystal (such as Yb:YAG).Lath front surface is pump face, plates pump light anti-reflection film；Two sides are laser
Light pass surface plates corresponding optical maser wavelength anti-reflection film according to used glancing incidence angles；Upper and lower two big face is contacted with heat sink, is realized
Heat dissipation；The processing of rear surface feather plucking；Pumping configuration includes that pump light source, coupled system, horizontal direction homogenize waveguide, imaging system,
Wherein:
The pump light source issues pump light, is coupled into the horizontal direction through the coupled system and homogenizes waveguide；
The horizontal direction homogenizes after waveguide homogenizes the horizontal direction of pump light, is input to the imaging system；
Horizontal direction is homogenized the pump light at waveguide outlet and is imaged in pump face by the imaging system, is pumping pump light
Intensity distribution on face is distributed unanimously with the pump light intensities homogenized at waveguide outlet in the horizontal direction.
Light beam after waveguide homogenizes homogenizes effect with optimal in waveguide outlet, pumps to glancing incidence lath
When, waveguide is homogenized using horizontal direction and homogenizes pump light in the horizontal direction, and horizontal direction is homogenized into waveguide outlet pump
Pu light is imaged onto lath pump face, it is contemplated that high-selenium corn (absorb path extremely short) of the glancing incidence plate to pump light, it is believed that plate
Inside-pumping light is absolute flat-top distribution in the horizontal direction, is effectively reduced the end face stress deformation of lath horizontal direction,
Improvement has the degeneration of laser beam quality caused by pumping end surface stress deformation.
Preferably, the pump light source is that laser diode bar item or laser diode fold battle array.
Preferably, the coupled system includes horizontal direction cylindrical lens and vertical direction cylindrical lens, by coupling pump light into
Horizontal direction homogenizes in waveguide.
Preferably, it includes the wave guide wall parallel to each other that two middle wares separate that the horizontal direction, which homogenizes waveguide,.
Preferably, it if the imaging system includes dry lens, is imaged by the way that level is homogenized the pump light at waveguide outlet
In pump face, the pump light intensities flat-top of pump face is realized, while also realizing and glancing incidence structure lath pump face is pumped
The control of spot size.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
1 present invention compared with gripping the scheme of mirror using phase altogether: 1) laser optical path is more simple；2) cost is relatively low, and is easy to real
It is existing；3) the laser output of higher power may be implemented.
2 present invention are compared with the scheme for being bonded cooling crystal in pumping end surface: 1) method is simple, it is easy to accomplish；2) safety
Reliably, will not the inner total reflection face to crystal cause to damage；3) cost is lower.
Detailed description of the invention
Fig. 1 is a kind of pumping configuration schematic diagram for high power glancing incidence slab laser beamquality improvement；
Fig. 2 is the high power glancing incidence slab laser oscillator structure schematic diagram realized using pumping configuration described in Fig. 1；
Fig. 3 is the high power glancing incidence slab laser amplifier structural schematic diagram realized using pumping configuration described in Fig. 1；
Fig. 4 is battened construction schematic diagram；
Fig. 5 is that horizontal direction homogenizes waveguiding structure schematic diagram；
Fig. 6 is lath Z-direction end face stress deformation schematic diagram；
In figure, 1 is lath, and 2 be laser beam, and 3 be the pump light after horizontal direction homogenizes waveguide 5 and imaging system 4,
4 be imaging system, and 5 homogenize waveguide for horizontal direction, and 6 be to be coupled into the pumping that horizontal direction homogenizes waveguide by coupled system 7
Light, 7 be coupled system, and 8 be pump light source, and 9 be laser total reflective mirror, and 10 be laser output mirror, and 11 be seed laser, and 12 be pumping
Face, 13 be upper cooling surface, and 14 be lower cooling surface, and 15 be clearance face, and 16 be pump light after horizontal direction homogenizes waveguide, 17,
18 be wave guide wall.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent the ruler of actual product
It is very little；
To those skilled in the art, the omitting of some known structures and their instructions in the attached drawings are understandable.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
It is enough realized the present embodiment provides a kind of pumping knot by for high power glancing incidence slab laser beamquality improvement
High power glancing incidence slab laser oscillator, wherein the pumping for high power glancing incidence slab laser beamquality improvement
Structure, such as Fig. 1, including pump light source 8, coupled system 7, horizontal direction homogenize waveguide 5, imaging system 4, in which:
Pump light is input to glancing incidence structure lath 1 after pumping configuration processing, and the glancing incidence structure lath 1 is for connecing
The face for receiving pump light is pump face 12, as shown in figure 4, lath front surface is pump face 12, plates pump light anti-reflection film；Two sides
For laser light pass surface 15, corresponding optical maser wavelength anti-reflection film is plated according to used glancing incidence angles；Upper cooling surface 13 and lower cooling
Face 14 is contacted with heat sink, realizes heat dissipation；The processing of rear surface feather plucking；
The pump light source 8 issues pump light, is coupled into the horizontal direction through the coupled system 7 and homogenizes waveguide 5；
The horizontal direction homogenizes after waveguide 5 homogenizes the horizontal direction of pump light, is input to the imaging system
4；
The pump light that horizontal direction homogenizes 5 exit of waveguide is imaged in pump face 12 by the imaging system 4, and pump light is made to exist
Intensity distribution in pump face 12 is distributed consistent with the pump light intensities for homogenizing 5 exit of waveguide in the horizontal direction.
The pump light source 8 is laser diode bar item.
The coupled system 7 includes horizontal direction cylindrical lens and vertical direction cylindrical lens, by coupling pump light water inlet square
To homogenizing in waveguide.
The horizontal direction homogenizes waveguide 5 as shown in figure 5, including the wave guide wall parallel to each other that two middle wares separate
17、18。
If the imaging system 4 includes dry lens, pumping is imaged on by the pump light that level is homogenized 5 exit of waveguide
On face 12, the pump light intensities flat-top of pump face 12 is realized, while also realizing and glancing incidence structure lath pump face 12 is pumped
The control of spot size and aberration.
In the specific implementation process, a kind of pumping knot by for high power glancing incidence slab laser beamquality improvement
The high power glancing incidence slab laser oscillator enough realized can also swash as shown in Fig. 2, the oscillator is continuous laser output
Q is adjusted to after modulation device is added in optical cavity or the pulse laser of mould-locking structure exports.
Embodiment 2
The present embodiment provides a kind of pumping configuration realizations by for high power glancing incidence slab laser beamquality improvement
High power glancing incidence slab laser amplifier, wherein the pump of the beamquality improvement for high power glancing incidence slab laser
Pu structure is identical as the pumping configuration in embodiment 1.
In the particular embodiment, a kind of pumping knot by for high power glancing incidence slab laser beamquality improvement
Structure realize high power glancing incidence slab laser amplifier, such as Fig. 3, according to amplifier use gain media type, it can be achieved that
The high brightness and high power of different seed lights amplify.Such as, using highly doped Nd vanadate, it can be achieved that from continuously to the 1064nm of ps
Laser amplifier；Using highly doped Yb crystal (such as Yb:YAG), it can be achieved that from continuously to the 1030nm laser amplifier of fs.
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be to this hair
The restriction of bright embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.It is all in the present invention
Spirit and principle within made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the claims in the present invention
Within the scope of shield.
Claims (5)
1. a kind of pumping configuration for high power glancing incidence slab laser beamquality improvement, pump light are tied through the pumping
Glancing incidence structure lath is input to after structure processing, the face that the glancing incidence structure lath is used to receive pump light is pump face,
It is characterized in that, including pump light source, coupled system, horizontal direction homogenize waveguide, imaging system, in which:
The pump light source issues pump light, is coupled into the horizontal direction through the coupled system and homogenizes waveguide；
The horizontal direction homogenizes after waveguide homogenizes the horizontal direction of pump light, is input to the imaging system；
Horizontal direction is homogenized the pump light at waveguide outlet and is imaged in pump face by the imaging system, is pumping pump light
Intensity distribution on face is distributed unanimously with the pump light intensities homogenized at waveguide outlet in the horizontal direction.
2. the pumping configuration according to claim 1 for high power glancing incidence slab laser beamquality improvement,
It is characterized in that, the pump light source is that laser diode bar item or laser diode fold battle array.
3. the pumping configuration according to claim 1 for high power glancing incidence slab laser beamquality improvement,
It is characterized in that, the coupled system includes horizontal direction cylindrical lens and vertical direction cylindrical lens.
4. the pumping configuration according to claim 1 for high power glancing incidence slab laser beamquality improvement,
It is characterized in that, it includes the wave guide wall parallel to each other that two middle wares separate that the horizontal direction, which homogenizes waveguide,.
5. the pumping configuration according to claim 1 for high power glancing incidence slab laser beamquality improvement,
Be characterized in that, if the imaging system includes dry lens, realize to glancing incidence structure lath pump face pump spot size and
The control of aberration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910049863.0A CN109586152B (en) | 2019-01-18 | 2019-01-18 | Pump structure for improved beam quality of high power grazing incidence slab laser |
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|---|---|---|---|
| CN201910049863.0A CN109586152B (en) | 2019-01-18 | 2019-01-18 | Pump structure for improved beam quality of high power grazing incidence slab laser |
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| CN109586152B CN109586152B (en) | 2024-03-12 |
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