CN205790928U - A kind of laser instrument with variable cross-section laser crystal - Google Patents
A kind of laser instrument with variable cross-section laser crystal Download PDFInfo
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- CN205790928U CN205790928U CN201620513817.3U CN201620513817U CN205790928U CN 205790928 U CN205790928 U CN 205790928U CN 201620513817 U CN201620513817 U CN 201620513817U CN 205790928 U CN205790928 U CN 205790928U
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Abstract
This utility model relates to a kind of laser instrument with variable cross-section laser crystal, including the fiber coupling system set gradually along light path, front cavity mirror, laser crystal, acousto-optic Q modulation device and Effect of Back-Cavity Mirror；Described fiber coupling system is made up of pumping source, Transmission Fibers and focusing coupled system；The two ends of laser crystal differ in size and have the variable cross-section of even transition vertically, and wherein small end one is placed on light path front end；Laser crystal outer surface is burnishing surface, and both ends of the surface are coated with the anti-reflection film for pump light and fundamental frequency light respectively, and laser crystal side surface is coated with the high-reflecting film for pump light.This utility model can make pump light be fully absorbed after reflection for several times inside laser crystal, strengthens energy storage and the conversion efficiency of pump light of laser crystal；Under conditions of laser output power is identical, shorten laser crystal length, reduce doping content and thermal gradient, improve thermal lensing effect, improve beam quality, it is thus achieved that there is the laser of variable cross-section laser crystal.
Description
Technical field
This utility model relates to a kind of laser instrument, particularly relates to a kind of laser instrument with variable cross-section laser crystal.
Background technology
Developing rapidly and extensively applying along with laser technology, laser instrument has become commercial production, scientific exploration, modern military
Deng the important tool that field is indispensable.Beam quality is an important indicator of laser instrument, is laser beam directional transmissions ability
Or the module of focusing spot energy intensity, the most in actual applications, there is the laser one of variable cross-section laser crystal
It it is directly the direction of industry pursuit.But along with the increase of laser output power, the factor such as heat effect can gradually be amplified, thus shadow
Ringing beam quality, therefore high power and high light beam quality are that opposition exists, and are must weighed during laser instrument research and development make
Individual problem.
In laser instrument manufacturing enterprise, conventional way is by increasing the length of operation material i.e. laser crystal minimizing heat ladder at present
The beam quality degradation that degree causes, thus obtain the laser that there is high power with high light beam quality.But this method increase
The chamber of laser instrument is long, constrains laser instrument to miniaturization integrated development, and improves manufacturing cost and the cycle of laser instrument,
Add debugging difficulty, reduce Business Economic Benefit.
Summary of the invention
This utility model provides a kind of laser instrument with variable cross-section laser crystal, uses the laser with axial variable cross-section brilliant
Body, and laser crystal side is coated with the film that is all-trans pump light, make pump light inside laser crystal after reflection for several times quilt
Fully absorb, strengthen energy storage and the conversion efficiency of pump light of laser crystal；Under conditions of laser output power is identical,
Shorten laser crystal length, reduce doping content and thermal gradient, improve thermal lensing effect, improve beam quality, it is thus achieved that have
The laser of variable cross-section laser crystal.
In order to achieve the above object, this utility model realizes by the following technical solutions:
A kind of laser instrument with variable cross-section laser crystal, including the fiber coupling system set gradually along light path, front cavity mirror,
Laser crystal, acousto-optic Q modulation device and Effect of Back-Cavity Mirror；Described fiber coupling system is by pumping source, Transmission Fibers and focusing coupled systemes
System composition；The two ends of laser crystal differ in size and have the variable cross-section of even transition vertically, and wherein small end one is placed on light
Front end, road；Laser crystal outer surface is burnishing surface, and both ends of the surface are coated with the anti-reflection film for pump light and fundamental frequency light respectively, swashs
Luminescent crystal side surface is coated with the high-reflecting film for pump light.
Described laser crystal be shaped as round platform, terrace with edge or prismatoid.
The both ends of the surface of described laser crystal are parallel or have an angle, angle≤5 °.
Centered by described pumping source, wavelength is the pumping source of 808nm, 880nm, 914nm, 938nm, 940nm or 946nm.
Described laser crystal is Nd:YAG crystal, Nd:YVO4 crystal, Nd:GGG crystal, Nd:YLF crystal, Nd:GdVO4
Crystal, Nd:YAP crystal, Nd:LuvO4 crystal or Yb:YAG crystal.
Described front cavity mirror, Effect of Back-Cavity Mirror are plano lens, concavees lens or convex lens.
The lumen type of laser instrument is straight chamber, v-shaped cavity, L-type chamber, Z-type chamber or ring-like chamber.
Compared with prior art, the beneficial effects of the utility model are:
Operation material is round table-like, and there is certain low-angle side, prevents self-excitation from going out light.
1) laser crystal has axial variable cross-section, can prevent self-excitation from going out light；The film that is all-trans of laser crystal side can make pumping
Light is multiple reflections in crystal, makes pump light fully absorb, and strengthens energy-storage property, improves pump light conversion efficiency；
2) the too low problem causing Pumping light absorption insufficient of doping content is solved, in the condition that laser output power is identical
Under, reduce doping content and thermal gradient, improve thermal lensing effect, improve beam quality, for obtaining, there is variable cross-section laser crystalline substance
The laser of body provides new approach；
3) be conducive to shortening the length of laser crystal, and shorten the required crystal generation time；Compression laserresonator chamber is long,
Reduce laser dimensions；Reduce machine cost, increase the benefit, advance the integrated process of miniaturization of solid state laser；
4) add the heat transfer area of laser crystal, reduce temperature control difficulty to a certain extent；Laser stability improves, fall
Low design difficulty, and installation and debugging are simple, it is simple to through engineering approaches is promoted.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is that pump light described in the utility model is at laser crystal internal reflection path schematic diagram.
Fig. 3 is the structural representation of this utility model embodiment 1.
Fig. 4 is the structural representation of this utility model embodiment 2.
In figure: 1. fiber coupling system 2. front cavity mirror 3. laser crystal 4. acousto-optic Q modulation device 5. Effect of Back-Cavity Mirror 6.
0 ° of HR1064HT532 lens 7. 9.45 ° of total reflective mirror of frequency-doubling crystal 8. Effect of Back-Cavity Mirror total reflective mirror 10. and frequency crystal 11.
0 ° of HR 1064&532HT355 lens
Detailed description of the invention
Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described further:
See Fig. 1, be structural representation of the present utility model, described in the utility model a kind of have variable cross-section laser crystal swash
Light device, including the fiber coupling system 1 set gradually along light path, front cavity mirror 2, laser crystal 3, acousto-optic Q modulation device 4
With Effect of Back-Cavity Mirror 5；Described fiber coupling system 1 is made up of pumping source, Transmission Fibers and focusing coupled system；Laser crystal 3
Two ends differ in size and there is the variable cross-section of even transition vertically, wherein small end one is placed on light path front end；Laser crystal
The outer surface of 3 is burnishing surface, and both ends of the surface are coated with the anti-reflection film for pump light and fundamental frequency light, laser crystal 3 side table respectively
Face is coated with the high-reflecting film for pump light.
Described laser crystal 3 be shaped as round platform, terrace with edge or prismatoid.
The both ends of the surface of described laser crystal 3 are parallel or have an angle, angle≤5 °.
Centered by described pumping source, wavelength is the pumping source of 808nm, 880nm, 914nm, 938nm, 940nm or 946nm.
Described laser crystal 3 is Nd:YAG crystal, Nd:YVO4 crystal, Nd:GGG crystal, Nd:YLF crystal, Nd:GdVO4
Crystal, Nd:YAP crystal, Nd:LuvO4 crystal or Yb:YAG crystal.
Described front cavity mirror 2, Effect of Back-Cavity Mirror 5 are plano lens, concavees lens or convex lens.
The lumen type of laser instrument is straight chamber, v-shaped cavity, L-type chamber, Z-type chamber or ring-like chamber.
The laser crystal 3 that this utility model uses is not conventional cylinder, but axially has the round platform in gradual change cross section, rib
Platform or prismatoid, the side of laser crystal 3 has a little inclination angle, prevents self-excitation from going out light.Laser crystal side complete
Anti-film can make pump light multiple reflections in crystal, makes pump light fully absorb, and strengthens energy-storage property, improves pump light and turns
Change efficiency.(as shown in Figure 2)
The operation principle of a kind of laser instrument with variable cross-section laser crystal described in the utility model is: the pumping that pumping source produces
Light is penetrated by Transmission Fibers, focuses on laser crystal 3, laser crystal 3 after over-focusing coupled system (coupled lens)
Stimulated radiation goes out light, and light, by after acousto-optic Q modulation device 4, is exported by Effect of Back-Cavity Mirror 5, front cavity mirror 2 (Fig. 1 is 0 ° complete
Anti-lens), constitute resonator cavity with Effect of Back-Cavity Mirror 5 (being 0 ° of lens that are all-trans in Fig. 1), make laser stably export.This laser instrument
Compact conformation, dress school is simple, and convenient amount metaplasia is produced.
Number of patent application is that the Chinese patent in 200920153040.4 (filing date on Mays 27th, 2009) discloses one
Kind of " frequency-doubling crystal and the solid state laser of optical fiber pump arrangement ", including multiple laser diodes, bull's-eye with
And truncated cone-shaped gain media.The cross section with larger area of described truncated cone-shaped gain media is positioned at bull's-eye side and (swashs
Light incident side), gain media is placed in a contact fashion with bull's-eye.Having of described truncated cone-shaped gain media is bigger
Being coated with pump light transmission and the optical thin film to the laser-bounce produced in gain media on the cross section of area, round platform table gain is situated between
It is coated with the optical thin film semi-transparent semi-reflecting to the laser produced in gain media on the cross section with less area of matter, carrys out shape with this
Become resonator cavity.
" frequency-doubling crystal and the solid state laser of optical fiber pump arrangement " although patent have employed truncated cone-shaped gain media, but its
Operation principle and effect and laser crystal described in the utility model 3 are entirely different, and concrete difference is as follows:
1) in this utility model, laser crystal 3 side is coated with pump light and is all-trans film, makes pump light anti-in laser crystal 3
Penetrate, make pump light be fully absorbed increase laser crystal 3 energy-storage property, improve pump light conversion efficiency；And " frequency-doubling crystal
Solid state laser with optical fiber pump arrangement " described truncated cone-shaped gain media is only at two ends plated film.
2) pump light in this utility model is incident by laser crystal 3 small end, brings out greatly and penetrates；And " frequency-doubling crystal and light
The solid state laser of fine pump arrangement " in, LASER Light Source is incident from the big end of truncated cone-shaped gain media.This utility model is from little
When end is incident, from Lang Gela invariant, pump light incides the process of laser crystal 3 outgoing again can be by formula table
It is shown as:
Nuy=n1u1y1=n2u2y2；
In above formula:
n、n1、n2Represent the refractive index of laser place medium, i.e. air refraction n, laser medium refractive index n respectively1, empty
Gas refractive index n2；
u、u1、u2Represent that laser is in laser crystal incidence end, laser crystal and laser crystal exit end beam divergence angle respectively；
y、y1、y2Represent that laser is in laser crystal incidence end, laser crystal and laser crystal exit end beam edge light respectively
Distance to optical axis；
Assuming that laser crystal used is Nd:YAG, each refractive index is respectively n=1, n1=1.81, n2=1；In this utility model
y、y1、y2, be equivalent to the half of laser crystal 3 face height, then y2>y1>y>1；
U in summary2<u, therefore this utility model uses the mode from the incidence of laser crystal 3 small end, is conducive to compressing pumping
The light angle of divergence, and then reach to improve beam quality, it is thus achieved that there is the utility model purpose of the laser of variable cross-section laser crystal.
3) laser crystal 3 in this utility model includes that two ends differ in size and have the variable cross-section of even transition vertically
All shapes, such as round platform, terrace with edge or prismatoid.And the circle in " frequency-doubling crystal and the solid state laser of optical fiber pump arrangement "
Platform shape gain media clearly shape is only truncated cone-shaped.
4) effect using the laser crystal 3 of special shape and the full plated film in surface in this utility model is to make pump light at laser
Crystal 3 is internal to be fully absorbed after reflection for several times, strengthens energy storage and the conversion efficiency of pump light of laser crystal 3；
Under conditions of laser output power is identical, shorten laser crystal 3 length, reduce doping content and thermal gradient, improve heat penetration
Mirror effect, improves beam quality, it is thus achieved that have the laser of variable cross-section laser crystal；And " frequency-doubling crystal and optical fiber pump arrangement
Solid state laser " in use truncated cone-shaped gain media effect be improve pumping uniformity, reduce gain media temperature
Difference and the various impacts thus brought.
Following example are implemented under premised on technical solutions of the utility model, give detailed embodiment and tool
The operating process of body, but protection domain of the present utility model is not limited to following embodiment.In following embodiment, method therefor is such as
It is conventional method without special instruction.
[embodiment 1]
As it is shown on figure 3, be a kind of laser instrument form based on this utility model basic structure, 808nm pump light is by optical fiber coupling
Assembly system 1 outgoing also focuses on 3Nd:YVO4 laser crystal 3；Laser crystal 3 stimulated radiation goes out the fundamental frequency of 1064nm
Light, 1064nm fundamental frequency light is modulated by acousto-optic Q modulation device 4.
In the present embodiment, front cavity mirror 2 is 45 ° of total reflective mirrors 9, and straight chamber is transformed into refrative cavity；Recycle 0 ° of HR1064HT532
Lens 6 fold light path, constitute resonator cavity with Effect of Back-Cavity Mirror total reflective mirror 8, utilize frequency-doubling crystal 7, by the fundamental frequency light of 1064nm
Frequency multiplication is the green glow of 532nm, 0 ° of HR1064HT532 lens 6 export.
In the present embodiment, because fundamental frequency light beam quality is high, energy density is high, so light-phototranstormation efficiency improves, loss is few,
The 532nm laser finally given, its pulse width, peak power is high, good beam quality, beneficially industrial process applications.
[embodiment 2]
As shown in Figure 4, in this enforcement just, on the architecture basics of [embodiment 2], add before frequency-doubling crystal 7 and frequency
0 ° of HR1064HT532 lens 6 is replaced with 0 ° of HR1064&532HT355 lens 11, by the light of 1064nm by crystal 9
By obtaining 355nm ultraviolet light after frequency multiplication and frequency.
The ultraviolet light that the present embodiment obtains has the advantages such as wavelength focusing short, easy, energy is high, pattern is good, is micro hole drilling, swashs
The ideal laser light source of light delineation；The fields such as this light source is processed in VHD CD-ROM drive, precise materials, light printing are widely used.
The above, only this utility model preferably detailed description of the invention, but protection domain of the present utility model does not limit to
In this, any those familiar with the art is in the technical scope that this utility model discloses, according to this utility model
Technical scheme and conceive equivalent or change in addition, all should contain within protection domain of the present utility model.
Claims (7)
1. a laser instrument with variable cross-section laser crystal, it is characterised in that include the optical fiber coupling set gradually along light path
Assembly system, front cavity mirror, laser crystal, acousto-optic Q modulation device and Effect of Back-Cavity Mirror；Described fiber coupling system is by pumping source, transmission
Optical fiber and focusing coupled system composition；The two ends of laser crystal differ in size and have the variable cross-section of even transition vertically, its
Middle small end side is placed in light path front end；The outer surface of laser crystal is burnishing surface, both ends of the surface be coated with respectively for pump light and
The anti-reflection film of fundamental frequency light, laser crystal side surface is coated with the high-reflecting film for pump light.
A kind of laser instrument with variable cross-section laser crystal the most according to claim 1, it is characterised in that described sharp
Luminescent crystal be shaped as round platform, terrace with edge or prismatoid.
A kind of laser instrument with variable cross-section laser crystal the most according to claim 1, it is characterised in that described sharp
The both ends of the surface of luminescent crystal are parallel or have an angle, angle≤5 °.
A kind of laser instrument with variable cross-section laser crystal the most according to claim 1, it is characterised in that described pump
Centered by source, Pu, wavelength is the pumping source of 808nm, 880nm, 914nm, 938nm, 940nm or 946nm.
A kind of laser instrument with variable cross-section laser crystal the most according to claim 1, it is characterised in that described sharp
Luminescent crystal is Nd:YAG crystal, Nd:YVO4 crystal, Nd:GGG crystal, Nd:YLF crystal, Nd:GdVO4 crystal, Nd:YAP
Crystal, Nd:LuvO4 crystal or Yb:YAG crystal.
A kind of laser instrument with variable cross-section laser crystal the most according to claim 1, it is characterised in that before described
Chamber mirror, Effect of Back-Cavity Mirror are plano lens, concavees lens or convex lens.
A kind of laser instrument with variable cross-section laser crystal the most according to claim 1, it is characterised in that laser instrument
Lumen type is straight chamber, v-shaped cavity, L-type chamber, Z-type chamber or ring-like chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620513817.3U CN205790928U (en) | 2016-05-31 | 2016-05-31 | A kind of laser instrument with variable cross-section laser crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620513817.3U CN205790928U (en) | 2016-05-31 | 2016-05-31 | A kind of laser instrument with variable cross-section laser crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205790928U true CN205790928U (en) | 2016-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620513817.3U Active CN205790928U (en) | 2016-05-31 | 2016-05-31 | A kind of laser instrument with variable cross-section laser crystal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205790928U (en) |
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2016
- 2016-05-31 CN CN201620513817.3U patent/CN205790928U/en active Active
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