CN204406012U - A kind of ps pulsed laser and ns pulsed laser frequency-variable module - Google Patents
A kind of ps pulsed laser and ns pulsed laser frequency-variable module Download PDFInfo
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- CN204406012U CN204406012U CN201520092717.3U CN201520092717U CN204406012U CN 204406012 U CN204406012 U CN 204406012U CN 201520092717 U CN201520092717 U CN 201520092717U CN 204406012 U CN204406012 U CN 204406012U
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- 239000013078 crystal Substances 0.000 claims abstract description 79
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 238000010330 laser marking Methods 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 210000002469 basement membrane Anatomy 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 7
- 230000009022 nonlinear effect Effects 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 20
- 239000013307 optical fiber Substances 0.000 description 14
- 241000196324 Embryophyta Species 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 11
- 230000006378 damage Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 239000007787 solid Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000010287 polarization Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The utility model discloses a kind of ps pulsed laser and ns pulsed laser frequency-variable module, comprise nonlinear crystal, resonator cavity and temperature control system: described nonlinear crystal be period polarized lithium niobate or other there is the crystal of nonlinear effect, described resonator cavity is by average chamber, flat-concave cavity, concavo-concave chamber or directly formed at nonlinear crystal end face coating, and that can be the device of temperature control also can be described temperature control system is air-cooled, water-cooled or the cooling system such as heat sink.By nonlinear crystal, resonator cavity and temperature control system are integrated into a module, user can change the frequency of existing nanosecoud pulse laser easily with it, thus obtain the Laser output of characteristic frequency, especially, the wavelength tuning of Output of laser can also be realized by changing design temperature.
Description
Technical field
The utility model relates to laser technology and nonlinear frequency transformation field, adopts and frequency or difference frequency technology, particularly mid infrared laser.
Background technology
After the sixties in 20th century laser technology utility model, people observe a lot of nonlinear effect in an experiment, and nonlinear optics is arisen at the historic moment.One of them important branch is optical frequency conversion, and it is the effective means expanding laser frequency spectrum.By producing switch technology in equifrequent with frequency, frequency multiplication and higher hamonic wave, Output of laser wavelength can be expanded to ultraviolet, deep ultraviolet direction; By switch technology under difference frequency, optically erasing, optical parametric oscillation equifrequent, can by Output of laser wavelength near infrared, in infrared and far infrared direction expand.
Optical parametric oscillator (OPO, Optical Parametric Oscillator) proposed as far back as 1962, to the eighties in 20th century, along with the appearance of the crystal of match based on birefringence position (BPM), and the development of semiconductor pumped all-solid state laser technology, OPO technology has had very large breakthrough.Especially, to the nineties in 20th century, based on the appearance (as period polarized lithium columbate crystal, lithium tantalate, magnesium-doped lithium niobate crystal etc.) of the optical super lattice material of Quasi phase matched (QPM) technology, OPO technology is pushed ahead again a step.
Optical parametric oscillator has a lot of advantage when producing Laser output: wavelength tuning range extensively, not retrains by pump wavelength; Can use multiple nonlinear crystal, tuning manner is various, comprises thermal tuning, cycle tuning etc.; Compact conformation, can all solidstate, system stability is strong.
At present, the laser instrument of specific wavelength is as the commercialization of all solid state laser of 1064nm or fiber laser, other wavelength are as middle-infrared band (3 ~ 5um, when the laser of this wave band transmits in an atmosphere, loss is lower, very important air infrared window) laser instrument little, and it is difficult especially to realize wavelength tuning.
Utility model content
The utility model can change the wavelength of existing ps pulsed laser and ns pulsed laser, and by the wavelength that Wavelength conversion needs to user, and wavelength can regulate continuously in certain wavelength band; The utility model can realize frequency inverted to all solid state, optical fiber, semiconductor nanosecoud pulse laser etc.; The utility model is a module, is integrated with nonlinear crystal, resonator cavity and temperature-controlling system, uses comparatively simple, solves the problem that OPO technology regulates difficulty; The utility model uses the crystal that nonlinear effect is very strong, and light light conversion efficiency is high, damage threshold is also higher, can obtain the frequency conversion laser output that power is more than watt level.
The technical solution of the utility model: a kind of ps pulsed laser and ns pulsed laser converter plant, comprises nonlinear crystal, resonator cavity and temperature control system; Described nonlinear crystal is cuboid; Described temperature control system, for the temperature of detection and control nonlinear crystal; Described nonlinear crystal and temperature control system are arranged in the cavity of resonator cavity, make the center conllinear of the front cavity mirror of resonator cavity and the center of Effect of Back-Cavity Mirror and former and later two end faces of nonlinear crystal, front cavity mirror is parallel with former and later two end faces of plane and nonlinear crystal of Effect of Back-Cavity Mirror.
Further, described nonlinear crystal is period polarized lithium columbate crystal, lithium tantalate, magnesium-doped lithium niobate crystal or potassium titanyl oxygenic phosphate(KTP) crystal.When laser through they time can occurrence frequency conversion, mostly realize based on QPM principle, by the way of artificial design cycle and temperature, the wavelength that wavelength convert can be needed to us.And the nonlinear effect of these crystal is strong, light injury threshold is higher, can be used for obtaining high power frequency conversion laser and export.If obtain wider wavelength tuning, we can change nonlinear crystal, are replaced with the nonlinear crystal of different cycles, and such mode is the mode relatively simply realizing wavelength tuning.The utility model changes nonlinear crystal and mirror ratio in chamber is easier to, and damage the situation of (nonlinear crystal place easily damages) if there is nonlinear crystal, maintenance cost also can be relatively low.
Further, described resonator cavity is the average chamber be made up of two flat mirrors, the flat-concave cavity be made up of flat mirror concave mirror or the concavo-concave chamber system be made up of two concave mirrors.Be used for amplifying laser FSE, promote conversion efficiency.
Further, described front cavity mirror, Effect of Back-Cavity Mirror and nonlinear crystal have all plated high transmittance film.
Further, described resonator cavity is directly at the resonator cavity that nonlinear crystal end face coating is formed.
Further, described temperature control system is control nonlinear crystal to obtain the device of steady temperature, or air-cooled, water-cooled or heat sink.Temperature control can be carried out to nonlinear crystal, because the refractive index of nonlinear crystal is relevant with its temperature, so change the refractive index that crystal temperature effect can change it, and then change frequency conversion laser wavelength.So change export the wavelength of frequency conversion laser by changing design temperature, be a kind ofly relatively simply realize the tuning mode of optical maser wavelength.
Further, pumping source adopts laser marking machine, and pumping laser is ps pulsed laser and ns pulsed laser, and pumping laser is approximate basement membrane Gaussian beam or flat top beam.Adopt the pump mode of end pump, the laser namely obtained after frequency inverted consistent with pumping laser direction (do not consider to disperse can think overlap).And require that the end face of two of nonlinear crystal logical light is vertical with pumping laser direction, pumping laser is through the center of the logical light end face of nonlinear crystal two.Pumping laser, needs advanced line focusing when in use, and focusing center position of from the front end about 1/3 in nonlinear crystal, focal beam spot size is 100 ~ 200 microns.
Further, described ps pulsed laser and ns pulsed laser converter plant to be fixed as one formula device by shell, and a cross is respectively designed in the entrance port of device and exit portal center, the center of entrance port and exit portal and the center conllinear in face, nonlinear crystal rear and front end.Work first regulates the attitude of this integrated device, allows pump light inject from the center of entrance port cross, penetrates, complete coarse adjustment from the center of exit portal cross.
Further, described temperature control system comprises the copper billet being wrapped in the nonlinear crystal left and right sides, for PDE plate and the heating rod of detection and control nonlinear crystal temperature, be arranged at the ceramic gasket of copper billet bottom, and be wrapped in that nonlinear crystal is outside to be supported nonlinear crystal by ceramic gasket and and one of nonlinear crystal interval enclose pottery.Like this except bottom, copper billet and ceramic integument do not contact, can better temperature control.
This device is an entirety, and user when in use, first allows laser direction vertical with nonlinear crystal end face, and allows laser by the center of the logical light end face of nonlinear crystal two, so just mixed up under low-power; Then improve pump power, when internal gain is greater than loss, just can obtain the Laser output after frequency conversion.The utility model can reduce the adjustment difficulty of user greatly.
Beneficial effect: the utility model is ps pulsed laser and ns pulsed laser frequency-variable module, nonlinear crystal, resonator cavity and temperature control system are integrated into a module, user can use easily when not knowing concrete principle, obtains stable, high power, tunable wave length frequency conversion laser and exports.By this utility model, like a cork existing nanosecoud pulse laser can be converted to middle-infrared band, its compatibility is very high, all solid state to existing nanosecond pulse, optical fiber, semiconductor laser light frequency conversion can be realized, and the wavelength tuning (middle-infrared band tuning range is approximately 300nm) of certain limit can be realized.Except this, good stability, damage threshold are high, conversion efficiency is high, can obtain the frequency conversion laser of more than watt level exports.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model ps pulsed laser and ns pulsed laser converter plant;
Fig. 2 is ps pulsed laser and ns pulsed laser converter plant schematic internal view;
The detailed description that Fig. 3 ps pulsed laser and ns pulsed laser frequency-variable module regulates;
Fig. 4 wavelength is with the variation relation of control temperature;
The ps pulsed laser and ns pulsed laser converter plant that Fig. 5 is inputted by optical fiber.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
(1) ps pulsed laser and ns pulsed laser converter plant (flat-concave cavity system)
A kind of ps pulsed laser and ns pulsed laser converter plant as shown in Figure 1, 2,1 place is mirror holder, and the inside fills the eyeglass of half inch, and front cavity mirror is flat mirror, material is calcium fluoride, filming parameter is HT@1064nm, HR@1450 ~ 1750nm, HT@2700 ~ 4000nm, Effect of Back-Cavity Mirror is concave mirror, curvature R is-100mm, and material is also calcium fluoride, and filming parameter is consistent with front cavity mirror; 2 places are PPMgO:LN (the periodic polarized lithium niobate of magnesium oxide doping), and polarization cycle is 29.4um, long 50mm, wide 4mm, high 2mm, logical light end face is 4mm*2mm, end face coating, parameter is HT@1064nm, HT@1450 ~ 1550nm, HT@3600 ~ 3900nm; 3 places are temperature-controlling system, wherein 5 is copper billet, there are PDE plate and heating rod below, for detection and control temperature, temperature-controlled precision is 0.01 degree Celsius, and little ceramic gasket is arranged at copper billet bottom, 6 is a circle pottery parcel, like this except bottom, copper billet and ceramic integument do not contact, can better temperature control; 4 places are the control line of PDE plate and heating rod, are connected with controller in outside, realize temperature and control.
Conllinear is wanted at the center of Effect of Back-Cavity Mirror concave surface and the center of nonlinear crystal two end faces, and the plane of Effect of Back-Cavity Mirror is parallel with the end face of crystal, also parallel with the plane of front cavity mirror.
The 1064nm fiber laser of selection and comparison maturation is as pumping source, and it has industrially had very ripe application---and laser marking machine, maximum power output is 50W.Because the hot spot of marking machine is all comparatively large, focus on more difficult, so first carry out contracting bundle, then select with polaroid the laser light making vertical polarization, refocusing, place with a tight waist is the subcircular hot spot that diameter is about 120um.Laser throws ps pulsed laser and ns pulsed laser frequency-variable module again into after small holes, and focal position is distance front end face about 1/3 place in nonlinear crystal, then sees that reflection spot beats the where place at aperture.Because chamber mirror and nonlinear crystal have all plated high transmittance film, intensity of reflected light is very weak, so do not worry that reflected light can damage pumping source laser instrument.Regulate the attitude such as pitching, inclination of ps pulsed laser and ns pulsed laser frequency-variable module, make reflection spot revert all through small hole center, pumping laser is described through the center of nonlinear crystal two end faces and the center of Effect of Back-Cavity Mirror concave surface, and vertical with crystal end-face, describe in detail and see that (when (a) adjusts, reflected light revert all passes through aperture to Fig. 3; B, when () pumping laser and crystal end-face out of plumb, reflected light can not back through aperture; When () pumping laser is without the center of Effect of Back-Cavity Mirror concave surface c, there is the obstructed small holes of reflection spot).And then increase pump power, when gain is greater than loss, the Laser output after frequency inverted just can be obtained.
Conveniently regulate, go out to devise a cross in the entrance port of this device and exit portal, the bore of entrance port and exit portal is 5mm, the center of entrance port and exit portal and the center conllinear of nonlinear crystal end face.First regulate the attitude of this device, allow pumping laser inject from the center of entrance port cross, penetrate from the center of exit portal cross, complete coarse adjustment; And then the reflection spot observed on aperture, regulate the attitude of this module, make all reflection spots all pass back through aperture, complete fine tuning.
The experiment proved that, power can be obtained with this device to export more than the frequency conversion laser of the 3.8um wave band of 1W, and achieve the Laser output of tunable wave length by changing temperature, export frequency conversion laser wavelength (Wavelength) with temperature (Temp) variation relation (signal) as shown in Figure 4.Use PPMgO:LN and the cavity mirror system in other cycles instead, at 1500 ~ 5000nm wave band, the frequency conversion laser that can both obtain the tunable wave length of higher-wattage exports (idler).Except this, use all solid state nanosecoud pulse laser instead as pumping source, also can obtain similar experimental result.
(2) ps pulsed laser and ns pulsed laser converter plant (crystal end-face plated film)
Another kind of ps pulsed laser and ns pulsed laser converter plant, comprise nonlinear crystal, material is PPMgO:LN, and polarization cycle is 29.4um, long 50mm, wide 4mm, high 2mm, logical light end face is 4mm*2mm, end face coating, parameter is HT@1064nm, HR@1450 ~ 1550nm, HT@3600 ~ 3900nm; Crystal end-face has plated the high-reflecting film to flashlight---and HR@1450 ~ 1550nm, constitutes resonator cavity with this; Also temperature control system will be had.Such nanosecond pulse frequency-variable module, shorten because chamber is long, loss reduces, and pumping threshold is lower than the module in (), and corresponding conversion efficiency can be high.But such device carries out multiple reflections by the end face coating of nonlinear crystal to flashlight, its damage threshold also can be relatively once low.Other aspects, the ps pulsed laser and ns pulsed laser frequency-variable module of this type also has other features of device in (), as can by control temperature wavelength tuning realizing frequency conversion laser etc.
(3) by ps pulsed laser and ns pulsed laser converter plant that optical fiber inputs
As shown in Figure 5, ps pulsed laser and ns pulsed laser converter plant and laser shaping and focusing system are combined, form a large module in dotted line frame, then extract with optical fiber.User when in use, only need pumping laser to be well coupled into optical fiber and (note the numerical aperture of optical fiber, ensure that pumping laser is less at optical fiber internal loss), do not need to carry out other operations again and just complete adjustment, using can be convenient.
And when design, laser shaping and focusing system needs do a coupling according to the diameter of optical fiber and the optical fiber Output of laser angle of divergence, make focal beam spot in the position of the forward end face of crystal about 1/3, spot size is 100 ~ 200 microns, and it is vertical with the end face of nonlinear crystal from the laser direction of optical fiber output, laser, through the center of nonlinear crystal two end faces, also passes the center of Effect of Back-Cavity Mirror concave surface.The governing loop being equivalent to mention before in (one) has been placed on design and assembling link, and user need not regulate again, and using can be more convenient.
Especially, if the optical fiber of conduction pump light is not only by this root optical fiber, but also be the gain fibre of doping gain media, laser is obtained like this in gain fibre, directly enter into laser shaping and focusing system, then pumping ps pulsed laser and ns pulsed laser frequency-variable module, obtains the frequency conversion laser required for us.It is the equal of so just the continuously adjustable nanosecond laser of wavelength of an optical-fiber laser pumping.
Claims (9)
1. a ps pulsed laser and ns pulsed laser converter plant, is characterized in that: comprise nonlinear crystal (2), resonator cavity (1) and temperature control system (3); Described nonlinear crystal is cuboid; Described temperature control system (3) is for the temperature of detection and control nonlinear crystal; Described nonlinear crystal (2) and temperature control system (3) are arranged in the cavity of resonator cavity (1), make the center conllinear of the front cavity mirror of resonator cavity (1) and the center of Effect of Back-Cavity Mirror and former and later two end faces of nonlinear crystal, front cavity mirror is parallel with former and later two end faces of plane and nonlinear crystal of Effect of Back-Cavity Mirror.
2. ps pulsed laser and ns pulsed laser converter plant according to claim 1, is characterized in that: described nonlinear crystal is period polarized lithium columbate crystal, lithium tantalate, magnesium-doped lithium niobate crystal or potassium titanyl oxygenic phosphate(KTP) crystal.
3. ps pulsed laser and ns pulsed laser converter plant according to claim 1, is characterized in that: described resonator cavity is the average chamber be made up of two flat mirrors, the flat-concave cavity be made up of flat mirror concave mirror or the concavo-concave chamber system be made up of two concave mirrors.
4. ps pulsed laser and ns pulsed laser converter plant according to claim 3, is characterized in that: described front cavity mirror, Effect of Back-Cavity Mirror and nonlinear crystal have all plated high transmittance film.
5. ps pulsed laser and ns pulsed laser converter plant according to claim 1, is characterized in that: described resonator cavity is directly at the resonator cavity that nonlinear crystal end face coating is formed.
6. ps pulsed laser and ns pulsed laser converter plant according to claim 1, is characterized in that: described temperature control system is control nonlinear crystal to obtain the device of steady temperature, or air-cooled, water-cooled or heat sink.
7. ps pulsed laser and ns pulsed laser converter plant according to claim 1, is characterized in that: pumping source adopts end pump laser marking machine, and pumping laser is ps pulsed laser and ns pulsed laser, and pumping laser is approximate basement membrane Gaussian beam or flat top beam.
8. ps pulsed laser and ns pulsed laser converter plant according to claim 1, it is characterized in that: described ps pulsed laser and ns pulsed laser converter plant to be fixed as one formula device by shell, a cross is respectively designed in the entrance port of device and exit portal center, the center of entrance port and exit portal and the center conllinear in face, nonlinear crystal rear and front end.
9. ps pulsed laser and ns pulsed laser converter plant according to claim 1, it is characterized in that: described temperature control system (3) comprises the copper billet (5) being wrapped in the nonlinear crystal left and right sides, for PDE plate and the heating rod of detection and control nonlinear crystal temperature, be arranged at the ceramic gasket of copper billet bottom, and be wrapped in that nonlinear crystal is outside to be supported nonlinear crystal by ceramic gasket and and one of nonlinear crystal interval to enclose ceramic (6).
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| CN201520092717.3U CN204406012U (en) | 2015-02-09 | 2015-02-09 | A kind of ps pulsed laser and ns pulsed laser frequency-variable module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767651A (en) * | 2018-08-08 | 2018-11-06 | 深圳市吉斯迪科技有限公司 | A kind of medical Double Pulses Q-Switch Laser of achievable zlasing mode switching |
| CN112864789A (en) * | 2021-01-11 | 2021-05-28 | 中国科学院理化技术研究所 | Picosecond pulse optical parameter frequency conversion laser output device |
-
2015
- 2015-02-09 CN CN201520092717.3U patent/CN204406012U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767651A (en) * | 2018-08-08 | 2018-11-06 | 深圳市吉斯迪科技有限公司 | A kind of medical Double Pulses Q-Switch Laser of achievable zlasing mode switching |
| CN108767651B (en) * | 2018-08-08 | 2024-04-30 | 深圳市吉斯迪科技有限公司 | Medical double-pulse Q-switched laser capable of realizing laser mode switching |
| CN112864789A (en) * | 2021-01-11 | 2021-05-28 | 中国科学院理化技术研究所 | Picosecond pulse optical parameter frequency conversion laser output device |
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