CN213278684U - Laser with adjustable power proportion and pulse interval - Google Patents
Laser with adjustable power proportion and pulse interval Download PDFInfo
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- CN213278684U CN213278684U CN202021983354.XU CN202021983354U CN213278684U CN 213278684 U CN213278684 U CN 213278684U CN 202021983354 U CN202021983354 U CN 202021983354U CN 213278684 U CN213278684 U CN 213278684U
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Abstract
The utility model discloses a power proportion and pulse interval adjustable laser instrument for realize 1150-1200 nm wave band dual wavelength near-infrared laser and 575-600 nm dual wavelength yellow light. The dual-wavelength Raman laser adopts a coaxial pumping structure, utilizes two laser gain media and one Raman crystal, and realizes dual-wavelength Raman light operation by taking dual-wavelength fundamental frequency light generated by the two laser gain media as an excitation source of the Raman laser, thereby realizing dual-wavelength yellow light output by carrying out frequency doubling on the dual-wavelength Raman laser in a cascade quasi-phase matching frequency doubling crystal on the basis. The power proportion and the pulse time interval of the dual-wavelength fundamental frequency light can be flexibly adjusted by changing the position of a pump light focusing point in the laser gain medium or changing the wavelength of the pump light, and meanwhile, the power proportion and the pulse time interval of the dual-wavelength Raman laser can be adjusted by exciting the Raman laser in the cavity, so that the dual-wavelength frequency-doubled yellow light output with adjustable power proportion and pulse interval is realized by frequency doubling outside the cavity.
Description
Technical Field
The utility model relates to an all-solid-state laser and nonlinear optics frequency conversion field, concretely relates to power proportion and pulse interval adjustable dual wavelength inner chamber raman laser and frequency doubling dual wavelength yellow laser.
Background
The dual-wavelength laser has great scientific research value and wide application prospect in the application and research fields of precision measurement, spectral analysis, remote sensing, nonlinear frequency conversion and the like, particularly the tunable dual-wavelength laser with similar wavelength can be used for a coherent radiation source for generating terahertz wave band by difference frequency, and is an important research direction in the field of optoelectronics at present.
The current methods for generating dual wavelength laser output are mainly:
1. two independent lasers are utilized to be combined into dual-wavelength laser, but the method has high implementation cost and large volume and weight, and the combination is difficult if the two wavelengths are close and the polarization directions are the same. In addition, for a laser with pulse operation, a complex pulse synchronization system needs to be added to realize pulse synchronization or time interval adjustment of the dual-wavelength laser, and the overall structure is extremely complex.
2. The laser with single wavelength is used for exciting two nonlinear crystals with different types, different cutting angles or different quasi-phase matching periods, and dual-wavelength laser output is realized in an optical parametric oscillator through the second-order nonlinear effect of the crystals.
3. The dual-resonance optical parametric oscillator formed by pumping a crystal by using single-wavelength laser enables signal light and idler frequency light of the optical parametric oscillator to start oscillation and output simultaneously, but the mode can only work near a degeneracy point of a phase matching curve generally, and can not realize tuning of dual-wavelength laser power proportion and pulse interval.
4. The composite energy level structure of a single laser gain medium is utilized to simultaneously output dual-wavelength fundamental frequency light as a dual-wavelength excitation source in the optical parametric oscillator, and dual-wavelength signal light output of the optical parametric oscillator is realized in a nonlinear crystal. In the method, due to gain competition between two fundamental frequency light wavelengths, the stability of the dual-wavelength signal light output by the excitation light parametric oscillator is poor, and the tuning of the dual-wavelength power ratio and the pulse interval cannot be realized.
5. The two laser crystals are coaxially pumped by the same pump source to realize dual-wavelength laser with adjustable power proportion and pulse interval, and the frequency can be expanded by combining an optical parametric oscillator excited by an inner cavity to realize dual-signal light output with adjustable power proportion and pulse interval. The method utilizes the second-order nonlinear effect of the crystal, is limited by the second-order nonlinear gain although the scheme is flexible, and is difficult to realize dual-wavelength signal light close to the fundamental frequency light.
Overall, the disadvantages and shortcomings of the existing dual wavelength laser technology are: the realization schemes of most dual-wavelength lasers have the problems of complex structure, high cost, poor stability and the like, and the power proportion and the pulse interval of dual-wavelength signal light can not be adjusted generally. Although the coaxial pumping dual-wavelength laser realizes the tuning of power proportion and pulse interval and realizes the expansion of laser frequency by combining the optical parametric oscillator, the expansion mode is only limited to the optical parametric oscillation technology based on the second-order nonlinear effect. The wavelengths generated by the optical parametric oscillator under the excitation of Nd-YAG laser are mostly located in wave bands of 1.5-1.6 μm, 2 μm, 3-5 μm and the like. YAG laser outputs a wave band (such as 1.1-1.2 μm) with a wavelength close to 1.06 μm, which is limited by second-order nonlinear gain, and is difficult to realize by an optical parametric oscillation technology, so that the laser frequency of the wave band (1.1-1.2 μm) can not be doubled to generate double-wavelength frequency-doubled yellow light with adjustable power ratio and pulse interval.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough among the prior art, provide a power proportion and pulse interval adjustable dual wavelength inner chamber raman laser and frequency multiplication dual wavelength yellow light laser, the utility model discloses a coaxial pumping structure utilizes two laser gain media and a raman crystal, and the dual wavelength fundamental frequency light that produces through two laser gain media realizes dual wavelength raman light operation as raman laser's excitation source, realizes dual wavelength yellow light output to dual wavelength raman laser doubling in the accurate phase match frequency multiplication crystal of tandem type on this basis. The power proportion and the pulse time interval of the dual-wavelength fundamental frequency light can be flexibly adjusted by changing the position of a pump light focusing point in the laser gain medium or changing the wavelength of the pump light, and meanwhile, the power proportion and the pulse time interval of the dual-wavelength Raman laser can be adjusted by exciting the Raman laser in the cavity, so that the dual-wavelength frequency-doubled yellow light output with adjustable power proportion and pulse interval is realized by frequency doubling outside the cavity. The utility model discloses simple structure is compact, and the power proportion and the pulse interval of dual wavelength raman laser and doubling of frequency yellow light are harmonious convenient, have important application prospect in fields such as precision measurement, spectral analysis, laser medical treatment, nonlinear optics frequency conversion.
The utility model aims at realizing through the following technical scheme:
a laser with adjustable power proportion and pulse interval comprises a pumping source, a pumping coupling system, a fundamental frequency light total reflection mirror, a first laser gain medium, a second laser gain medium, a Q-switching device, a Raman laser total reflection mirror, a Raman crystal, a Raman laser output mirror, a Raman laser focusing mirror, a frequency doubling crystal and a low-pass filter which are arranged in sequence;
the Raman laser output mirror is simultaneously and totally reflecting the fundamental frequency light, wherein the wavelength of the fundamental frequency light is in the range of 1040-1080 nm; under the feedback action of a fundamental frequency light resonant cavity formed by the fundamental frequency light total reflection mirror and the Raman laser output mirror, two coaxial first laser gain media and second laser gain media generate dual-wavelength fundamental frequency light; generating a third-order nonlinear effect, namely stimulated Raman scattering, under the action of a Raman laser resonant cavity formed by a Raman laser total reflection mirror and a Raman laser output mirror, converting dual-wavelength fundamental frequency light into dual-wavelength Raman laser in a Raman crystal, wherein the wavelength of the Raman laser is located in a 1150-1200 nm wave band and is output through the Raman laser output mirror; the dual-wavelength Raman laser is focused in the frequency doubling crystal through the Raman laser focusing mirror and converted into dual-wavelength yellow light, the yellow light wavelength is located in a 575-600 nm wave band, and the dual-wavelength Raman laser is filtered through the low-pass filter and then output.
Furthermore, the first laser gain medium and the second laser gain medium are composed of two different kinds of laser crystals or two same kinds of laser crystals with different cutting directions, and active ions of the laser crystals are trivalent neodymium ions (Nd)3+) And two end faces of the laser crystal are plated with a pumping light antireflection film and a fundamental frequency light antireflection film.
Furthermore, the Q-switching device is an acousto-optic Q-switching device or an electro-optic Q-switching device, and two ends of the Q-switching device are plated with fundamental frequency light antireflection films for realizing the pulse operation of fundamental frequency light and improving the conversion efficiency of the stimulated Raman scattering process by improving the peak power.
Furthermore, the lens of the fundamental frequency light total reflection mirror is a plane mirror or a plano-concave mirror, and is plated with a fundamental frequency light total reflection film and a pumping light antireflection film; the Raman laser total reflection mirror is a concave mirror or a flat mirror and is plated with a fundamental frequency light antireflection film and a Raman laser high reflection film; two end faces of the Raman crystal are plated with a fundamental frequency light antireflection film and a Raman laser antireflection film; the Raman laser output mirror is a concave mirror or a flat mirror and is plated with a Raman laser part transmission film; the Raman laser focusing lens is a convex lens and is plated with a Raman laser antireflection film; the frequency doubling crystal is plated with an antireflection film of Raman laser and frequency doubling yellow light; the low-pass filter mirror is plated with a Raman laser high-reflection film and a frequency-doubling yellow light antireflection film.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
1. the utility model discloses realize a power proportion and pulse interval adjustable dual wavelength inner chamber raman laser and frequency multiplication dual wavelength yellow light laser, only need a pumping source, two laser gain media, a raman crystal and a frequency multiplication crystal, utilize two laser gain media of coaxial placing under the terminal surface pumping of same pumping source, can produce dual wavelength fundamental frequency light, fundamental frequency light wavelength is in 1040-1080 nm scope, can realize controlling the dual wavelength fundamental frequency light power proportion and the pulse time interval of intracavity oscillation in a flexible way through adjusting the position or the pumping light wavelength of pumping light focus point in laser gain media;
2. the Raman laser resonant cavity is arranged in the fundamental frequency light resonant cavity, the high power density in the fundamental frequency light resonant cavity can be fully utilized, the high-efficiency frequency conversion is realized based on the third-order nonlinear effect of the Raman crystal, and the dual-wavelength Raman laser with the wave band of 1150-1200 nm is generated and output; the dual-wavelength Raman laser is focused and then enters a frequency doubling crystal, and frequency doubling is carried out under the phase matching condition to convert the dual-wavelength Raman laser into dual-wavelength yellow light with a wave band of 575-600 nm. Because the power proportion and the pulse interval of the double-wavelength fundamental frequency light for exciting the double-wavelength Raman laser are adjustable, the power proportion and the pulse interval of the generated double-wavelength Raman laser and the double-wavelength yellow light generated after frequency doubling are adjustable.
3. The utility model discloses utilize coaxial pumping structure to combine the frequency conversion based on third-order nonlinear effect stimulated Raman scattering, can realize compact structure, output stable dual wavelength Raman laser, overcome the optical parameter oscillation technique based on second order nonlinear effect and be difficult to the fundamental frequency light direct conversion who is 1040-1080 nm scope to 1150-1200 nm wave band shortcoming, and dual wavelength Raman laser's power proportion and pulse interval are nimble adjustable, it can cover the sodium yellow light wave band to produce the dual wavelength yellow light behind the raman laser doubling, at precision measurement, spectral analysis, nonlinear frequency conversion and sodium guide in the application have important value.
Drawings
Fig. 1 is a schematic structural diagram of the laser of the present invention.
Reference numerals: the device comprises a 1-pumping source, a 2-pumping coupling system, a 3-fundamental frequency light total reflection mirror, a 4-first laser gain medium, a 5-second laser gain medium, a 6-Q-switching device, a 7-Raman laser total reflection mirror, an 8-Raman crystal, a 9-Raman laser output mirror, a 10-Raman laser focusing mirror, an 11-frequency doubling crystal and a 12-low-pass filter.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the dual-wavelength intracavity raman laser and the frequency-doubled dual-wavelength yellow laser include a pumping source 1, a pumping coupling system 2, a fundamental-frequency light total reflection mirror 3, a first laser gain medium 4, a second laser gain medium 5, a Q-tuning device 6, a raman laser total reflection mirror 7, a raman crystal 8, a raman laser output mirror 9, a raman laser focusing mirror 10, a frequency-doubled crystal 11, and a low-pass filter 12, which are sequentially arranged. The pump source 1 is a semiconductor laser coupled and output by an optical fiber, the central wavelength of output laser is 808nm, the core diameter of the optical fiber is 400 microns, the numerical aperture is 0.22, and the laser output by the pump source 1 is guided into the pump coupling system 2 through the energy transmission optical fiber. The pump coupling system 2 is a 1:2 coupling lens group, and can focus pump light to be incident into the first laser gain medium 4 and the second laser gain medium 5. The first laser gain medium 4 is Nd-YAG crystal Nd3+A doping concentration of 0.6%, a crystal size of 4mm × 4mm × 7mm, and a second laser gain medium 5 of Nd: YAP crystal, Nd cut along the b-axis3+The doping concentration is 1%, the crystal size is 3mm multiplied by 10mm, and two end faces of the two laser gain media are respectively plated with antireflection films with the thickness of about 800nm and about 1050 nm. The fundamental frequency light resonant cavity is composed of a fundamental frequency light total reflection mirror 3 and a Raman laser output mirror 9, the fundamental frequency light total reflection mirror 3 is a plano-concave mirror, the curvature radius of a concave surface is 500mm, a high reflection film near 1050nm is plated on the concave surface of the mirror, and an antireflection film near 800nm is plated on a plane on one side of the pumping source 1. Acousto-optic medium of Q-switching device 6The quartz is fused, the length of a medium is 35mm, the ultrasonic working frequency is 41MHz, the driving power is 20W, and the Q-switching frequency is 10 kHz. The Raman laser resonant cavity consists of a Raman laser total reflection mirror 7 and a Raman laser output mirror 9, wherein the Raman laser total reflection mirror 7 is a flat mirror and is plated with a 1040-1080 nm waveband antireflection film and a 1150-1200 nm waveband high reflection film. The Raman laser output mirror 9 is a flat mirror, a 1040-1080 nm waveband high-reflection film and 1150-1200 nm partial transmission films are plated, the 1150-1200 nm Raman light transmittance is about 10%, and the substrate of the cavity mirror lens is made of K9 glass. The Raman crystal 8 is YVO cut along the a axis4The crystal has the size of 3mm multiplied by 30mm, and both end faces are plated with 1040-1080 nm wave band high-reflection films and 1150-1200 nm wave band antireflection films. The Raman laser focusing lens 10 is a biconvex lens, the focal length is 200mm, and two surfaces of the Raman laser focusing lens are plated with anti-reflection films with wave bands of 1150-1200 nm. The frequency doubling crystal 11 is a cascade Period Polarization Lithium Niobate (PPLN) crystal, the size of the crystal is 1mm multiplied by 5mm multiplied by 30mm, two polarization periods of 9.6 microns and 9.1 microns are sequentially arranged along the light propagation direction, and anti-reflection films with wave bands of 1150-1200 nm and 575-600 nm are plated on two end faces of the frequency doubling crystal 11. The low-pass filter 12 has high reflection for the wavelength band of 1000-1300 nm and high transmission for the wavelength band of 500-650 nm.
The first laser gain medium 4Nd: YAG and the second laser gain medium 5Nd: YAP absorb pump light, the energy state of activated particles is transited from a ground state to an excited state, so that pump light energy is stored in an upper energy level of the laser, when the Q-switched device 6 is in a closed state, the number of particles in the upper energy level is continuously accumulated and generates a large number of reversed numbers of particles, when the Q-switched device 6 is opened, the gain exceeds loss, the laser oscillation condition is met, violent stimulated radiation amplification is rapidly realized through feedback of a fundamental frequency light resonant cavity, giant pulse fundamental frequency light oscillation is established in the resonant cavity, the wavelength of fundamental frequency laser is 1064nm and 1079nm, and the pulse repetition frequency is consistent with the Q-switched frequency and is 10 kHz. Simultaneously, 8YVO is passed through Raman crystal4The third-order nonlinear effect of the Raman laser is that base frequency light of 1064nm and 1079nm generates stimulated Raman scattering under the action of a Raman laser resonant cavity, frequency shift of the base frequency light of dual-wavelength is converted to 1176nm and 1196nm, and dual-wavelength laser of 1176nm and 1196nm is output through a Raman laser output mirror 9. The dual-wavelength Raman laser passes through a Raman laser focusing lens 10 and is converged into a straight lineLight spots with the diameter of about 100 mu m are merged into the frequency doubling crystal 11, dual-wavelength yellow light of 588nm and 598nm is generated through quasi-phase matching frequency doubling, and residual Raman light is filtered by the low-pass filter 12 to output yellow light. When the power of the pump light is 16W, and the focal point of the pump light is 3mm away from the left end face in the first gain medium 4, the total power of the output dual-wavelength Raman laser is 1.88W, wherein the power of 1176nm is 1.12W, the power of 1196nm is 0.76W, and the power of 1176nm is earlier than that of 1196nm Raman optical pulse by 5ns, and the Raman optical pulse is generated and output; after frequency multiplication, the 588nm yellow light power is 0.42W, the 598nm yellow light power is 0.25W, wherein 588nm pulses are generated and output 5ns earlier than 598nm pulses.
The method comprises the steps that activated particles in a first laser gain medium 4Nd: YAG and a second laser gain medium 5Nd: YLF absorb pump light to generate population inversion, the positions of a pump light focus point in the first laser gain medium 4 and the second laser gain medium 5 are adjusted by changing the front-back position of a 1:2 coupling lens in a pump coupling system 2, the volumes of the pump light in the first laser gain medium 4 and the second laser gain medium 5 can be changed, the population density of the inversion particles in the first laser gain medium 4 and the second laser gain medium 5 is changed, or the wavelength of the pump light is changed by adjusting the temperature of a pump source 1, the absorption coefficients of the first laser gain medium 4 and the second laser gain medium 5 are changed, the power of the pump light absorbed by the first laser gain medium 4 and the second laser gain medium 5 is changed, and the first laser gain medium 4, the second laser gain medium 5, the pump light power absorbed by the first laser gain medium 4, the second laser gain medium 5, The inversion population density in the second laser gain medium 5 changes. The photon density and pulse establishing time of the 1064nm and 1079nm dual-wavelength fundamental-frequency light in the fundamental-frequency light resonant cavity formed by the fundamental-frequency light total reflection mirror 3 and the raman laser output mirror 9 can be influenced by the change of the population density of the inversion particles in the first laser gain medium 4 and the second laser gain medium 5. Meanwhile, the Raman crystal 8YVO4Can generate stimulated Raman scattering effect, converts base frequency laser into Raman laser through the Raman scattering effect of the mobile phone under the action of a Raman laser resonant cavity consisting of a Raman laser total reflection mirror 7 and a Raman laser output mirror 9, leads the photon density and the pulse establishment time of dual-wavelength Raman laser of 1176nm and 1196nm in the Raman laser resonant cavity to change, and realizes the output of the Raman laser output mirror 9The power proportion and the pulse time interval of the 1176nm and 1196nm dual-wavelength Raman laser are adjusted, and the power proportion and the pulse time interval of the frequency doubling dual-wavelength yellow light generated by the frequency doubling crystal 11 are also adjustable. When the power of the pump light is 16W, and the distance between the pump light focal point and the left end surface of the first gain medium 4 is 4mm, the total power of the output dual-wavelength Raman laser is 1.79W, wherein the power of 1176nm is 0.90W, and the power of 1196nm is 0.89W; after frequency multiplication, the power of 588nm yellow light is 0.34W, the power of 598nm yellow light is 0.33W, the power of the dual-wavelength Raman laser and the power of the frequency multiplication yellow light are almost equal, and pulses are almost synchronous on a time domain.
To sum up, the embodiment of the utility model provides a pair of power proportion and pulse interval adjustable dual wavelength inner chamber raman laser and frequency doubling dual wavelength yellow laser adopts coaxial pumping structure to utilize two laser gain media, a raman crystal and a frequency doubling crystal, and the dual wavelength fundamental frequency light that produces through two laser gain media is as raman crystal's dual excitation source, excites raman crystal's third-order nonlinear effect in fundamental frequency light intracavity, realizes the high-efficient production of dual wavelength raman laser through stimulated raman scattering. The power proportion and the pulse interval of the dual-wavelength Raman laser can be flexibly controlled by adjusting the position of a pump light focusing point in the laser gain medium or the wavelength of the pump light, and then the dual-wavelength yellow laser with adjustable power proportion and pulse interval is realized by frequency doubling. The utility model provides a power ratio and the pulse interval of the dual wavelength laser that exist among the prior art can not tune, the structure is complicated, the relatively poor problem of system stability to realized based on the nonlinear effect of third-order-the dual wavelength raman laser output of stimulated raman scattering, and based on cascaded PPLN crystal's high efficiency dual wavelength doubling of frequency yellow light output.
The embodiment of the utility model provides an in, can select the kind, doping concentration or the size of laser gain medium, raman crystal and doubling crystal according to actual need to and the specification and size, curvature radius, coating film index isoparametric of base frequency light total reflection mirror, raman laser output mirror and raman laser focusing mirror.
The embodiment of the utility model provides a except that doing special explanation to the model of each device, the restriction is not done to the model of other devices, as long as can accomplish the device of above-mentioned function all can.
The present invention is not limited to the above-described embodiments. The above description of the embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above embodiments are merely illustrative and not restrictive. Without departing from the spirit of the invention and the scope of the appended claims, the person skilled in the art can make many changes in form and detail within the teaching of the invention.
Claims (4)
1. A laser with adjustable power proportion and pulse interval is characterized by comprising a pumping source (1), a pumping coupling system (2), a fundamental frequency light total reflection mirror (3), a first laser gain medium (4), a second laser gain medium (5), a Q-switching device (6), a Raman laser total reflection mirror (7), a Raman crystal (8), a Raman laser output mirror (9), a Raman laser focusing mirror (10), a frequency doubling crystal (11) and a low-pass filter mirror (12) which are sequentially arranged;
the Raman laser output mirror (9) is used for totally reflecting fundamental frequency light at the same time, wherein the wavelength of the fundamental frequency light is in the range of 1040-1080 nm; under the feedback action of a fundamental frequency light resonant cavity formed by the fundamental frequency light total reflection mirror (3) and the Raman laser output mirror (9), two coaxial first laser gain media (4) and second laser gain media (5) generate dual-wavelength fundamental frequency light; generating a third-order nonlinear effect, namely stimulated Raman scattering, under the action of a Raman laser resonant cavity formed by a Raman laser total reflection mirror (7) and a Raman laser output mirror (9), converting dual-wavelength fundamental frequency light into dual-wavelength Raman laser in a Raman crystal (8), wherein the wavelength of the Raman laser is located in a 1150-1200 nm wave band and is output through the Raman laser output mirror (9); the dual-wavelength Raman laser is focused in a frequency doubling crystal (11) through a Raman laser focusing mirror (10) and converted into dual-wavelength yellow light, the yellow light wavelength is located in a 575-600 nm wave band, and the dual-wavelength Raman laser is filtered through a low-pass filter mirror (12) and then is output.
2. The method of claim 1 wherein said power ratio and pulseThe laser with the adjustable interval is characterized in that the first laser gain medium (4) and the second laser gain medium (5) are composed of two laser crystals of different types or two laser crystals of the same type and different cutting directions, and active ions of the laser crystals are trivalent neodymium ions (Nd)3+) And two end faces of the laser crystal are plated with a pumping light antireflection film and a fundamental frequency light antireflection film.
3. The laser with adjustable power ratio and pulse interval as claimed in claim 1, wherein the Q-switching device (6) is an acousto-optic Q-switching device or an electro-optic Q-switching device, and both ends of the Q-switching device (6) are coated with anti-reflection films for fundamental frequency light, so as to implement pulsed operation of the fundamental frequency light, and improve the conversion efficiency of the stimulated raman scattering process by improving the peak power.
4. The laser with adjustable power ratio and pulse interval as claimed in claim 1, wherein the mirror of the fundamental frequency total reflection mirror (3) is a flat mirror or a flat concave mirror, and is coated with a fundamental frequency total reflection film and a pumping light reflection reducing film; the Raman laser total reflection mirror (7) is a concave mirror or a flat mirror and is plated with a fundamental frequency light antireflection film and a Raman laser high reflection film; two end faces of the Raman crystal (8) are plated with a fundamental frequency light antireflection film and a Raman laser antireflection film; the Raman laser output mirror (9) is a concave mirror or a flat mirror and is plated with a Raman laser part transmission film; the Raman laser focusing lens (10) is a convex lens and is plated with a Raman laser antireflection film; the frequency doubling crystal (11) is plated with an antireflection film for Raman laser and frequency doubling yellow light; the low-pass filter (12) is plated with a Raman laser high-reflection film and a frequency-doubling yellow light reflection reducing film.
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| CN114389128A (en) * | 2021-12-31 | 2022-04-22 | 苏州英谷激光有限公司 | High-power continuous laser with wavelength of 532nm-559nm-588nm from Raman |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114389128A (en) * | 2021-12-31 | 2022-04-22 | 苏州英谷激光有限公司 | High-power continuous laser with wavelength of 532nm-559nm-588nm from Raman |
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