CN109244808A - A kind of Nd:YLF laser and its beamquality improvement method based on cylindrical mirror - Google Patents
A kind of Nd:YLF laser and its beamquality improvement method based on cylindrical mirror Download PDFInfo
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- CN109244808A CN109244808A CN201811157068.5A CN201811157068A CN109244808A CN 109244808 A CN109244808 A CN 109244808A CN 201811157068 A CN201811157068 A CN 201811157068A CN 109244808 A CN109244808 A CN 109244808A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 35
- 238000005086 pumping Methods 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 claims description 6
- 230000001788 irregular Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 208000013201 Stress fracture Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005424 photoluminescence Methods 0.000 description 1
- 238000002360 preparation method Methods 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
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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 Nd:YLF laser and its beamquality improvement method based on cylindrical mirror, including workbench, LD pumping source and YLF crystal are provided on front side of the workbench, the two sides of the YLF crystal are arranged in parallel with outgoing mirror and cylindrical mirror on front side of workbench respectively, the YLF crystal, outgoing mirror and cylindrical mirror are collinearly arranged, and the line between LD pumping source and YLF crystal is perpendicular.The present invention alleviates light beam fortuitous distortion caused by YLF crystal using column concave mirror, the transition diverging of light beam in one direction is effectively reduced in the case where not changing light beam normal divergence, it is obviously improved output beam contoured profile, realize the laser output of high light beam quality, structure is simple, cost of manufacture is lower, easily operated in practical application.
Description
Technical field
The invention belongs to laser technology fields, more particularly to a kind of Nd:YLF laser and its light based on cylindrical mirror
Beam quality ameliorative way.
Background technique
Compared with the laser crystal of other neodymium-dopeds, with photoluminescence line, wide, natural birefringence is much larger than heat to Nd:YLF crystal
The features such as birefringent, crystal thermal lensing effect is small is caused, therefore is with a wide range of applications.However YLF crystal is anisotropy
Matrix, all directions stress coefficient is different in crystal, and crystal pyroconductivity is lower, therefore wavefront thermal distoftion is fortuitous distortion, sternly
Ghost image rings the beam quality of output laser, and when non-uniform stress distribution is more than certain limit, it is easy to appear crackles for crystal.Cause
This, improves beam profile, improves output beam quality to meet the fields such as industrial processes, Military Medical to Nd:YLF Solid State Laser
The requirement of device high light beam quality.
At present, the method for improving Nd:YLF solid state laser output beam quality mainly has: (1) intracavitary insertion transmitance is in
The soft-sided apertured of Gaussian Profile carries out modeling.(2) ball adding column combination microscope group counteracting crystal thermal stress is two-fold in resonant cavity
Astigmatism problem caused by penetrating improves output beam profile, mode distribution.Although the above method can effectively improve output beam matter
Amount, but the insertion of tracavity optical element increases the internal loss of laser, influences laser overall output power；Except this it
Outside, insertion optical element in inner cavity increases laser debugging difficulty, and laser is not easy out light in debugging process.
Summary of the invention
The Nd:YLF laser and its beamquality improvement side that it is an object of that present invention to provide a kind of based on cylindrical mirror
Method, having improves the distribution of Nd:YLF solid state laser Output mode, thus the characteristics of obtaining the output of high light beam quality laser,
Meet Nd:YLF solid state laser in the application in the fields such as industrial processes, military affairs and medical treatment with this.
In order to achieve the above object, the present invention uses following proposal.
A kind of Nd:YLF laser based on cylindrical mirror, including workbench, the workbench front side are provided with LD pump
Pu source and YLF crystal, the two sides of the YLF crystal are arranged in parallel with outgoing mirror and cylindrical surface for reflection on front side of workbench respectively
Mirror, the YLF crystal, outgoing mirror and cylindrical mirror are collinearly arranged, and the line between LD pumping source and YLF crystal mutually hangs down
Directly, the cylindrical mirror and outgoing mirror constitute resonant cavity, and laser vibrates output in resonant cavity.
The effective reflection section of the cylindrical mirror is 1040nm~1060nm.
A kind of beamquality improvement method of the Nd:YLF laser based on cylindrical mirror, the specific steps of which are as follows:
Step 1 opens laser power supply switch, generates laser on LD pumping source irradiation YLF crystal, laser is in resonant cavity
Oscillating tank, cylindrical mirror and outgoing mirror are finely tuned when pumping current is near laser threshold makes output facula be in best
State gradually increases pumping current, shoots output facula wheel using camera when pumping current is 18A, output power is 1.8W
It is wide；
Cylindrical mirror is replaced with plane mirror by step 2, uses camera to shoot under output laser power on an equal basis defeated
Glossing up profile；
Step 3, from the point of view of the obtained output facula profile diagram of shooting, output facula profile is when hysteroscope is plane mirror
Irregular strip, output beam overall profile is evenly distributed, is round and smooth when hysteroscope is cylindrical mirror；By between different hysteroscopes
The comparison of output beam profile, cylindrical mirror inhibit light beam in the irregular diverging of a direction, hence it is evident that improve output light
Beam contoured profile, improves quality for outputting laser beam.
Compared with prior art, the beneficial effects of the present invention are:
The present invention directlys adopt the method effective compensation light beam astigmatism that hysteroscope is cylindrical mirror, avoids intracavitary unnecessary damage
Consumption；Plano-concave cavity configuration is used in cavity effects, using cylindrical mirror in the case where not changing intracavity beam normal divergence
The characteristics of inhibiting intracavity beam a direction transition diverging, alleviates output beam fortuitous distortion, improves the uneven profile of light beam,
Realize the output of high light beam quality laser；The configuration of the present invention is simple, cost of manufacture is lower, easily operated in practical application.
Detailed description of the invention
Fig. 1 is integrally-built structural schematic diagram of the invention；
Fig. 2 be hysteroscope be cylindrical mirror when output beam profile schematic diagram；
Fig. 3 be hysteroscope be plane mirror when output beam profile schematic diagram；
In figure: 1- workbench, 2-LD pumping source, 3-YLF crystal, 4- outgoing mirror, 5- cylindrical mirror.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Nd:YLF of the present invention is single axial birefringence crystal, can generate simultaneously and be parallel to optical axis direction oscillation
1047nm (π polarization) and 1053nm (σ polarization) laser perpendicular to optical axis direction.Since Nd:YLF belongs to anisotropy matrix,
Crystal thermal stress fracture threshold value is too low, and pyroconductivity is smaller relative to isotropic body, the meeting when pump light acts on crystal
Make to generate a large amount of heat in crystal, water cooling can only play plane of crystal cooling effect, and non-uniform Temperature Distribution causes in crystal
Light beam generates wavefront fortuitous distortion；Hysteroscope is that the cylindrical mirror of concave surface is effective in the case where not changing intracavity beam normal divergence
Inhibit the transition diverging in intracavity beam a direction, alleviates the distribution of light beam irregular contour, improve the mould of output beam
Formula distribution situation improves the quality of output laser beam to a certain extent.
It is of the existing technology in order to solve the problems, such as based on principle above, as shown in Figure 1, the present invention provides one kind
Nd:YLF laser based on cylindrical mirror, including workbench 1 are provided with LD pumping source 2 and YLF crystal on front side of workbench 1
3, LD pumping source 2 is electrically connected with laser power supply here, and the two sides of YLF crystal 3 are arranged in parallel with respectively positioned at 1 front side of workbench
Outgoing mirror 4 and cylindrical mirror 5, YLF crystal 3, outgoing mirror 4 and cylindrical mirror 5 be collinearly arranged, and with LD pumping source 2 and
Line between YLF crystal 3 is perpendicular, and cylindrical mirror 1 and outgoing mirror 3 constitute resonant cavity, and the chamber of resonant cavity is a length of here
450mm, laser vibrate output in resonant cavity, and all structures are in the inside of laser in the present embodiment.
Specifically, the effective reflection section of cylindrical mirror 5 is 1040nm~1060nm, such 5 meeting of cylindrical mirror
Generate better reflecting effect.
In the present embodiment, cylindrical mirror 5 selects the specification that radius of curvature is 5m and outer diameter is 25.4mm, and compares
The angle of divergence in below table obtains the optimum size of cylindrical mirror 5, and the angle of divergence is by prior art laser beam here
Mass-synchrometer measures；
| Φ/mm | f’/m | θ/mrad |
| 25.4 | 3 | 1.6 |
| 25.4 | 5 | 1.5 |
| 25.4 | 8 | 1.7 |
Wherein, Φ is the outer diameter of cylindrical mirror 5, and f ' is 5 focus of cylindrical mirror to 5 pin deck of cylindrical mirror
Distance, θ are the angle of divergence of cylindrical mirror 5；
It is 5m by the distance that analysis result obtains 5 focus of cylindrical mirror to 5 pin deck of cylindrical mirror, and it is anti-to choose cylinder
Penetrating 5 concave surface of mirror and plating center membrane to the distance between 5 outer wall of cylindrical mirror is 3mm, to column at the top of 5 concave surface plated film of cylindrical mirror
The 5mm of distance between 5 outer wall of face reflecting mirror, the output facula effect generated in such laser irradiation to cylindrical mirror 5 are more preferable.
A kind of course of work of the Nd:YLF laser beam quality ameliorative way based on cylindrical mirror, including following step
It is rapid:
Step 1 opens laser power supply switch, and LD pumping source 2, which irradiates on YLF crystal 3, generates laser, and laser is in resonant cavity
Middle oscillating tank, cylindrical mirror 5 and outgoing mirror 4 are finely tuned when pumping current is near laser threshold is in output facula
Optimum state gradually increases pumping current, shoots output light using camera when pumping current is 18A, output power is 1.8W
Spot profile；
Step 2, as shown in Fig. 2, cylindrical mirror 5 is replaced with plane mirror, make under output laser power on an equal basis
Output facula profile is shot with camera；
Step 3, as shown in figure 3, from the point of view of the obtained output facula profile diagram of shooting, hysteroscope exports when being plane mirror
Light spot profile is irregular strip, and output beam overall profile is evenly distributed, is round and smooth when hysteroscope is cylindrical mirror 5；Pass through
The comparison of output beam profile between different hysteroscopes, cylindrical mirror 5 inhibits light beam in the irregular diverging of a direction, bright
It is aobvious to improve output beam contoured profile, improve quality for outputting laser beam.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (3)
1. a kind of Nd:YLF laser based on cylindrical mirror, including workbench, it is characterised in that: set on front side of the workbench
Be equipped with LD pumping source and YLF crystal, the two sides of the YLF crystal be arranged in parallel with respectively outgoing mirror on front side of workbench and
Cylindrical mirror, the YLF crystal, outgoing mirror and cylindrical mirror are collinearly arranged, and between LD pumping source and YLF crystal
Line is perpendicular, and the cylindrical mirror and outgoing mirror constitute resonant cavity, and laser vibrates output in resonant cavity.
2. a kind of Nd:YLF laser based on cylindrical mirror according to claim 1, which is characterized in that the cylinder
The effective reflection section of reflecting mirror is 1040nm~1060nm.
3. a kind of beamquality improvement method of Nd:YLF laser based on cylindrical mirror according to claim 1,
It is characterized in that, the specific steps of which are as follows:
Step 1 opens laser power supply switch, generates laser on LD pumping source irradiation YLF crystal, laser vibrates in resonant cavity
Resonance, cylindrical mirror and outgoing mirror are finely tuned when pumping current is near laser threshold makes output facula be in best shape
State gradually increases pumping current, shoots output facula profile using camera when pumping current is 18A, output power is 1.8W；
Cylindrical mirror is replaced with plane mirror by step 2, shoots output light using camera under output laser power on an equal basis
Spot profile；
Step 3, from the point of view of the obtained output facula profile diagram of shooting, output facula profile is not advise when hysteroscope is plane mirror
Then strip, output beam overall profile is evenly distributed, is round and smooth when hysteroscope is cylindrical mirror；By being exported between different hysteroscopes
The comparison of beam profile, cylindrical mirror inhibit light beam in the irregular diverging of a direction, hence it is evident that improve output beam wheel
Exterior feature distribution, improves quality for outputting laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811157068.5A CN109244808A (en) | 2018-09-30 | 2018-09-30 | A kind of Nd:YLF laser and its beamquality improvement method based on cylindrical mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811157068.5A CN109244808A (en) | 2018-09-30 | 2018-09-30 | A kind of Nd:YLF laser and its beamquality improvement method based on cylindrical mirror |
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| Publication Number | Publication Date |
|---|---|
| CN109244808A true CN109244808A (en) | 2019-01-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811157068.5A Pending CN109244808A (en) | 2018-09-30 | 2018-09-30 | A kind of Nd:YLF laser and its beamquality improvement method based on cylindrical mirror |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06209132A (en) * | 1992-08-20 | 1994-07-26 | Fuji Photo Film Co Ltd | Solid-state laser |
| US5848091A (en) * | 1997-01-21 | 1998-12-08 | The Twentyfirst Century Corp. | Laser resonator with improved output beam characteristics |
| US5946337A (en) * | 1998-04-29 | 1999-08-31 | Lambda Physik Gmbh | Hybrid laser resonator with special line narrowing |
| CN1402389A (en) * | 2002-09-06 | 2003-03-12 | 中国科学院上海光学精密机械研究所 | Laser resonant cavity containing column lens |
| CN1564389A (en) * | 2004-04-12 | 2005-01-12 | 武汉华工飞腾光子科技有限公司 | Laser LED pump solid laser |
| CN101741003A (en) * | 2009-12-29 | 2010-06-16 | 北京理工大学 | Cascade 2-mu m solid laser of double-wavelength mixed pumping |
| CN102136670A (en) * | 2011-01-27 | 2011-07-27 | 山西大学 | Double-end end-pumped solid laser based on polarization coupling |
| US20180123308A1 (en) * | 2015-08-19 | 2018-05-03 | Gigaphoton Inc. | Laser unit |
| CN208835445U (en) * | 2018-09-30 | 2019-05-07 | 沈阳理工大学 | A kind of Nd:YLF laser based on cylindrical mirror |
-
2018
- 2018-09-30 CN CN201811157068.5A patent/CN109244808A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06209132A (en) * | 1992-08-20 | 1994-07-26 | Fuji Photo Film Co Ltd | Solid-state laser |
| US5848091A (en) * | 1997-01-21 | 1998-12-08 | The Twentyfirst Century Corp. | Laser resonator with improved output beam characteristics |
| US5946337A (en) * | 1998-04-29 | 1999-08-31 | Lambda Physik Gmbh | Hybrid laser resonator with special line narrowing |
| CN1402389A (en) * | 2002-09-06 | 2003-03-12 | 中国科学院上海光学精密机械研究所 | Laser resonant cavity containing column lens |
| CN1564389A (en) * | 2004-04-12 | 2005-01-12 | 武汉华工飞腾光子科技有限公司 | Laser LED pump solid laser |
| CN101741003A (en) * | 2009-12-29 | 2010-06-16 | 北京理工大学 | Cascade 2-mu m solid laser of double-wavelength mixed pumping |
| CN102136670A (en) * | 2011-01-27 | 2011-07-27 | 山西大学 | Double-end end-pumped solid laser based on polarization coupling |
| US20180123308A1 (en) * | 2015-08-19 | 2018-05-03 | Gigaphoton Inc. | Laser unit |
| CN208835445U (en) * | 2018-09-30 | 2019-05-07 | 沈阳理工大学 | A kind of Nd:YLF laser based on cylindrical mirror |
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Application publication date: 20190118 |
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