CN207216230U - A kind of device for improving nonlinear crystal frequency switched laser optical quality - Google Patents
A kind of device for improving nonlinear crystal frequency switched laser optical quality Download PDFInfo
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- CN207216230U CN207216230U CN201721304528.3U CN201721304528U CN207216230U CN 207216230 U CN207216230 U CN 207216230U CN 201721304528 U CN201721304528 U CN 201721304528U CN 207216230 U CN207216230 U CN 207216230U
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Abstract
The utility model discloses a kind of device for improving nonlinear crystal frequency switched laser optical quality, and described device includes nonlinear crystal unit and walks off compensation crystal unit；The nonlinear crystal unit includes nonlinear crystal, the nonlinear crystal is made up of beta barium borate crystal or beta barium borate crystal or caesium-lithium borate crystal, the compensation crystal unit that walks off includes uniaxial crystal, and the uniaxial crystal is made up of yttrium vanadate crystal or alpha barium borate crystal.The utility model compensates Shape correction using compensation crystal is walked off to the laser facula after nonlinear crystal frequency is changed, so that circular laser facula is obtained on the premise of the luminous power of switched laser is not lost, improve optical quality, it is and simple to operate, positive effect, cost is low, solves the technical problem of the laser facula degradation of output.
Description
Technical field
The utility model belongs to crystal laser domain technology field, and in particular to one kind improves nonlinear crystal frequency conversion
The device of laser facula quality.
Background technology
In laser developments history, laser frequency conversion technology is a kind of important technology for expanding laser spectrum scope
Means, by frequency transformation, we are achieved that optical maser wavelength is extended into UV wave bands in addition to visible ray is even shorter.And
Obtained by laser frequency conversion in short wavelength laser output procedure, the use of nonlinear crystal plays the angle that can not be substituted
Color.The invention of nonlinear crystal enriches laser spectrum, has widened wave-length coverage, especially in short wavelength range, even more occurs
As LBO（Lithium triborate crystal）、BBO（Beta-barium borate）、CLBO（Caesium-lithium borate crystal）、KBBF（Fluoro boron potassjum beryllate crystal）
Deng star's crystal.
But use nonlinear crystal carry out laser frequency conversion during, due to birefringence effect bring can not
The walk-off walk-off effects avoided so that caused switched laser is gradual in certain effective nonlinear interaction length
Elongate, deviate from fundamental frequency light path, so often cause the laser facula degradation of output.Generally, laser light is exported
Spot can become ellipticity, can become growth ellipse under serious conditions or even become comets tail shaped laser spot, especially walk-off effect is compared
Big nonlinear crystal, such as BBO, lbo crystal, it is even more so during UV wavelength lasers are obtained.
The content of the invention
（1）Technical scheme
In order to obtain the circular light spot of better quality, while available laser power is not interfered with again, the utility model provides
A kind of device for improving nonlinear crystal frequency switched laser optical quality, described device include nonlinear crystal unit and walked off
Compensate crystal unit（Walk-off compensates crystal unit）；The nonlinear crystal unit includes nonlinear crystal, described non-thread
Property crystal is made up of beta-barium borate crystal or beta-barium borate crystal or caesium-lithium borate crystal, described to walk off compensation crystal unit
（Walk-off compensates crystal unit）Including uniaxial crystal, the uniaxial crystal is by yttrium vanadate crystal or α-barium borate crystal structure
Into the nonlinear crystal unit walks off compensation crystal unit with described（Walk-off compensates crystal unit）For separate structure
Or an overall structure is turned into by optical veneering bonding.
Further, the thickness l for walking off compensation crystal2By the deviation angle θ of switched laser1With effective nonlinear interaction
Distance l1And walk off the deviation angle θ of compensation crystal2Determine, and meet relational expression l2=（l1tanθ1）/tanθ2。
Further, it is described to walk off compensation crystal unit（Walk-off compensates crystal unit）In walk off compensation crystal
Optical axis cutting angle is 40 ° ~ 50 °, it is preferred that described to walk off compensation crystal unit（Walk-off compensates crystal unit）In walk
Optical axis cutting angle from compensation crystal is 45 °.
Further, it is described to walk off compensation crystal unit（Walk-off compensates crystal unit）Also include in nonlinear crystal
Identical bears single shaft or negative biaxial crystal.
（2）Beneficial effect
The beneficial effects of the utility model：Compared to prior art, the utility model, which uses, walks off compensation crystal to passing through
Laser facula after nonlinear crystal frequency conversion compensates Shape correction so that the luminous power of switched laser be not lost
Under the premise of obtain circular laser facula, improve optical quality, and simple to operate, positive effect, cost is low, solve due to
The walk-off effect that birefringence effect is brought, caused switched laser is gradually drawn in certain effective nonlinear interaction length
It is long, fundamental frequency light path is deviate from, causes the technical problem of the laser facula degradation of output.
Brief description of the drawings
Fig. 1 is the structural representation for improving nonlinear crystal frequency switched laser optical quality；
Fig. 2 is the knot for improving nonlinear crystal frequency switched laser optical quality using negative single shaft or negative biaxial crystal
Structure schematic diagram；
Fig. 3 is the device for improving nonlinear crystal frequency switched laser optical quality by way of optical veneering or bonding
Structural representation.
Embodiment
The utility model is further described with reference to embodiment.
Embodiment one
The implementation case provides a kind of device for improving nonlinear crystal frequency switched laser optical quality, described device bag
Include nonlinear crystal unit 1 and walk off compensation crystal unit（Walk-off compensates crystal unit）2；The nonlinear crystal unit
1 includes nonlinear crystal, and the nonlinear crystal is made up of beta-barium borate crystal or beta-barium borate crystal or caesium-lithium borate crystal,
It is described to walk off compensation crystal unit（Walk-off compensates crystal unit）2 include uniaxial crystal, and the uniaxial crystal is by Yttrium Orthovanadate
Crystal or α-barium borate crystal are formed, and the nonlinear crystal unit 1 walks off compensation crystal unit with described（Walk-off is compensated
Crystal unit）2 are separate structure or turn into an overall structure by optical veneering bonding.
The thickness l for walking off compensation crystal2By the deviation angle θ of switched laser1With effective nonlinear interaction distance l1And walk
From the deviation angle θ of compensation crystal2Determine, and meet relational expression l2=（l1tanθ1）/tanθ2, it is described to walk off compensation crystal unit
（Walk-off compensates crystal unit）The optical axis cutting angle for walking off compensation crystal in 2 is 45 °, described to walk off compensation crystal list
Member（Walk-off compensates crystal unit）The optical axis cutting angle for walking off compensation crystal in 2 is, described to walk off compensation crystal list
Member（Walk-off compensates crystal unit）2, which also include identical in nonlinear crystal, bears single shaft or negative biaxial crystal.
As shown in figure 1, be that the utility model improves nonlinear crystal frequency switched laser optical quality schematic device, its
In walk off compensation crystal be positive single shaft, in the nonlinear crystal in the incident normal incidence nonlinear crystal unit 1 of basic frequency laser 101,
Arrow therein represents its optical axis direction or z-axis direction, due to being influenceed by nonlinear crystal walk-off effect so that conversion swashs
Light 102 is constantly elongated in effective nonlinear interaction distance, and hot spot is deteriorated.The output nonlinear crystal of laser 102 when
Wait, its hot spot is elongated in principal plane, and based on this, compensation crystal unit is walked off by calculating to devise（Walk-off is compensated
Crystal unit）2, arrow therein represents its optical axis direction or z-axis direction so that laser 102, which passes right through, walks off compensation crystalline substance
Body thickness l2, hot spot re-compresses back initial circular state.
According to negative single shaft nonlinear crystal beta-barium borate in the I type-Ⅱphase matching condition that meets（o1064+o1064→e532）Under, it is right
Exemplified by two frequency-doubled conversion 532nm laser of fundamental frequency 1064nm wavelength lasers, improvement compensation process is further described to more than.
To beta-barium borate crystal, phase matching angle is 22.78 °, and the refractive index of frequency doubled light is ne(532nm)=1.675、no(532nm)=
1.556, it is 3.17 ° that can calculate its angle walked off.Assuming that the length l of nonlinear crystal1For 5mm, then the distance walked off
For d1=l1tanθ1=0.277mm, compensation crystal is walked off if being used as from yttrium vanadate crystal, and 45 ° of cuttings are carried out to its optical axis, then
The angle that yttrium vanadate crystal walks off to 532nm laser is 6.215 °, by formula d2=l2tanθ2L can be drawn2For 2.544mm, i.e.,
It can be circle by light-dark cycle to need 2.544mm thickness yttrium vanadate crystal.
As shown in Fig. 2 it is negative single shaft or negative biaxial crystal wherein to walk off compensation crystal 2, because positive and negative axle compensates crystal
Middle optical axis set it is different, so the direction placed during use is also different, in addition other specific implementation process and principle and Fig. 1
It is identical, it will not be repeated here.
Shown in Fig. 3, nonlinear crystal can be made by way of optical veneering or bonding and walks off compensation crystal as one
Individual integral device uses, and then causes practical more succinct more efficient.
Embodiment described above only expresses preferred embodiment of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to the utility model patent scope.It should be pointed out that for the common of this area
For technical staff, without departing from the concept of the premise utility, some deformations can also be made, improves and substitutes, this
Belong to the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should using appended claims as
It is accurate.
Claims (5)
1. a kind of device for improving nonlinear crystal frequency switched laser optical quality, it is characterised in that described device includes non-
Linear crystal unit（1）With walk off compensation crystal unit（2）；The nonlinear crystal unit（1）It is described including nonlinear crystal
Nonlinear crystal is made up of beta-barium borate crystal or beta-barium borate crystal or caesium-lithium borate crystal, described to walk off compensation crystal unit
（2）Including uniaxial crystal, the uniaxial crystal is made up of yttrium vanadate crystal or α-barium borate crystal, the nonlinear crystal unit
（1）Compensation crystal unit is walked off with described（2）Being bonded for separate structure or by optical veneering turns into an overall structure.
2. a kind of device for improving nonlinear crystal frequency switched laser optical quality according to claim 1, its feature
It is：The thickness l for walking off compensation crystal2By the deviation angle θ of switched laser1With effective nonlinear interaction distance l1And walk off
Compensate the deviation angle θ of crystal2Determine, and meet relational expression l2=（l1tanθ1）/tanθ2。
3. a kind of device for improving nonlinear crystal frequency switched laser optical quality according to claim 1, its feature
It is：It is described to walk off compensation crystal unit（2）In walk off compensation crystal optical axis cutting angle be 40 ° ~ 50 °.
4. a kind of device for improving nonlinear crystal frequency switched laser optical quality according to claim 3, its feature
It is：It is described to walk off compensation crystal unit（2）In walk off compensation crystal optical axis cutting angle be 45 °.
5. a kind of device for improving nonlinear crystal frequency switched laser optical quality according to claim 1, its feature
It is：It is described to walk off compensation crystal unit（2）Also include identical in nonlinear crystal and bear single shaft or negative biaxial crystal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721304528.3U CN207216230U (en) | 2017-10-11 | 2017-10-11 | A kind of device for improving nonlinear crystal frequency switched laser optical quality |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721304528.3U CN207216230U (en) | 2017-10-11 | 2017-10-11 | A kind of device for improving nonlinear crystal frequency switched laser optical quality |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561814A (en) * | 2017-10-11 | 2018-01-09 | 福建科彤光电技术有限公司 | A kind of device for improving nonlinear crystal frequency switched laser optical quality |
| CN112467510A (en) * | 2020-12-03 | 2021-03-09 | 北京科益虹源光电技术有限公司 | Harmonic wave walk-off compensation device and method |
-
2017
- 2017-10-11 CN CN201721304528.3U patent/CN207216230U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561814A (en) * | 2017-10-11 | 2018-01-09 | 福建科彤光电技术有限公司 | A kind of device for improving nonlinear crystal frequency switched laser optical quality |
| CN112467510A (en) * | 2020-12-03 | 2021-03-09 | 北京科益虹源光电技术有限公司 | Harmonic wave walk-off compensation device and method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180410 Termination date: 20211011 |