CN108448375A - Fixed pulse width intracavity frequency doubling green (light) laser and operating method - Google Patents
Fixed pulse width intracavity frequency doubling green (light) laser and operating method Download PDFInfo
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- CN108448375A CN108448375A CN201810388786.7A CN201810388786A CN108448375A CN 108448375 A CN108448375 A CN 108448375A CN 201810388786 A CN201810388786 A CN 201810388786A CN 108448375 A CN108448375 A CN 108448375A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/117—Q-switching using intracavity acousto-optic devices
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Abstract
The invention discloses a kind of fixed pulse width intracavity frequency doubling green (light) laser and operating methods, back mirror, planoconvex spotlight and the first acousto-optic Q-switching, first laser hysteroscope, second laser hysteroscope, laser crystal, the second acousto-optic Q-switching, polarizing film, the frequency-doubling crystal of back mirror, second laser including first laser device, the back mirror of the first laser device is placed on motorized precision translation stage, changes the length of laser cavity by the position of the back mirror of change first laser device；Planoconvex spotlight, the first acousto-optic Q-switching, second laser hysteroscope, laser crystal, first laser hysteroscope, the second acousto-optic Q-switching, polarizing film, frequency-doubling crystal are disposed between the back mirror of the first laser device, the back mirror of second laser.The present invention can realize that the pulsewidths constant of different frequency, effect are preferable by changing chamber length.
Description
Technical field
The present invention relates to field of laser device technology, more particularly to a kind of fixed pulse width intracavity frequency doubling green (light) laser and
Operating method.
Background technology
Solid state laser has that light frequency is fast, and peak power is high, the in stable condition advantage of light extraction, therefore is widely applied to
Ranging, tracking, guidance, punching, cutting and welding, semi-conducting material annealing, electronic device micro Process, atmospheric monitoring, spectrum are ground
Study carefully, many aspects such as surgery and ophthalmologic operation, pulse holography.The pulsewidth of solid state laser is usually with pump power, tune Q
Frequency, chamber length change and change.The solid state laser of MOPA is carried out for no, if the pulsewidth of light extraction is allowed to keep not
Become, usually the parameter of all lasers can all be recorded, by controlling pump power, going out light frequency come so that laser
What pulsewidth was consistent, but usually such case needs to dress to worst situation, is to go out optical frequency with pump power highest
On the basis of pulsewidth when rate highest, when going out light frequency decline, the power for reducing pump light is needed, in this way low heavy
Frequently laser pulse width is approximate consistent with the pulsewidth under Gao Zhongying high pump power under low pump power.It is done so that maximum problem
It is exactly that pump power under low repetition is relatively low, goes out that light energy is relatively low, what is become in this way is nonsensical.
Invention content
Technical problem present in for the above-mentioned prior art, the object of the present invention is to provide a kind of fixed pulse width intracavitary times
Frequency green (light) laser and operating method.
To achieve the purpose of the present invention, the present invention provides a kind of fixed pulse width intracavity frequency doubling green (light) lasers, including
The back mirror A1 of one laser, the back mirror A2 of second laser, planoconvex spotlight B and the first acousto-optic Q-switching C, first
Laser mirror D1, second laser hysteroscope D2, laser crystal E, the second acousto-optic Q-switching F, polarizing film N, frequency-doubling crystal M,
The back mirror A1 of the first laser device is placed on motorized precision translation stage G, after changing first laser device
The position of speculum A1 changes the length of laser cavity；The back mirror A1 of the first laser device, second laser it is rear anti-
It penetrates between mirror A2 and is disposed with planoconvex spotlight B, the first acousto-optic Q-switching C, second laser hysteroscope D2, laser crystal E, first swashs
Optical cavity mirror D1, the second acousto-optic Q-switching F, polarizing film N, frequency-doubling crystal M.
Correspondingly, the present invention also provides a kind of fixed pulse width intracavity frequency doubling green (light) laser operating method, the laser
Device includes that the back mirror A1 of first laser device, the back mirror A2 of second laser, planoconvex spotlight B and the first acousto-optic Q are opened
C, first laser hysteroscope D1, second laser hysteroscope D2, laser crystal E, the second acousto-optic Q-switching F, polarizing film N, frequency-doubling crystal M are closed,
The back mirror A1 of the first laser device is placed on motorized precision translation stage G, after changing first laser device
The position of speculum A1 changes the length of laser cavity；The back mirror A1 of the first laser device, second laser it is rear anti-
It penetrates between mirror A2 and is disposed with planoconvex spotlight B, the first acousto-optic Q-switching C, second laser hysteroscope D2, laser crystal E, first swashs
Optical cavity mirror D1, the second acousto-optic Q-switching F, polarizing film N, frequency-doubling crystal M.
Compared with prior art, beneficial effects of the present invention are that the application can realize different frequencies by changing chamber length
The pulsewidths constant of rate can ensure the invariance of pulsewidth in certain frequency range, while either under low repetition and high
Highest pump power can be used under repetition, either can realize that highest energy is defeated in low repetition or Gao Zhongying
Go out.
Description of the drawings
Fig. 1 show the structural schematic diagram of the application；
In figure, the back mirror of A1- first laser devices, the back mirror of A2- second lasers, B- planoconvex spotlights, C-
One acousto-optic Q-switching, D1- first laser hysteroscopes, D2- second laser hysteroscopes, E- laser crystals, the second acousto-optic Q-switchings of F-, N- polarizations
Piece, M- frequency-doubling crystals, H- green reflection mirrors, I- beam splitters, K- power monitor devices, G- motorized precision translation stages, K- photoelectric probes, J-
Motor servo driver, the driving of Q- acousto-optic Q-switchings, L- pulsewidth monitoring devices, U-MCU control panels.
Specific implementation mode
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
It should be noted that " connection " described herein and the word for expressing " connection ", as " being connected ",
" connected " etc. was both directly connected to another component including a certain component, and also passed through other component and another portion including a certain component
Part is connected.
It should be noted that term " first " in the description and claims of this application and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so that presently filed embodiment described herein for example can be in addition to herein
Sequence other than those of diagram or description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that
Be to cover it is non-exclusive include, for example, containing the process of series of steps or unit, method, system, product or equipment not
Those of be necessarily limited to clearly to list step or unit, but may include not listing clearly or for these processes, side
The intrinsic other steps of method, product or equipment or unit.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
As shown in Figure 1, the present invention provides a kind of fixed pulse width intracavity frequency doubling green (light) laser, including first laser device
Back mirror A1, the back mirror A2 of second laser, planoconvex spotlight B and the first acousto-optic Q-switching C, first laser hysteroscope D1,
Second laser hysteroscope D2, laser crystal E, the second acousto-optic Q-switching F, polarizing film N, frequency-doubling crystal M,
Wherein (A1) BC (D1) (D2) EFNM (A2) are expressed as the cavity composition of intracavity frequency doubling green (light) laser.In the design
Middle A1A2 is the speculum in laser, and fundamental frequency light is in laser chamber body by the back mirror A1 of first laser device through BC (D1)
(D2) EFN to M is propagated, and when fundamental frequency light is after M, since M is frequency-doubling crystal, the frequency conversion of fundamental frequency light part is at frequency doubled light, base
Frequency light and frequency doubled light are propagated and are reflected to A2, and after reflected light is again by M, frequency conversion is at double again for part of fundamental light
Frequency light, II type-Ⅱphase matchings used herein, so the polarization direction of fundamental frequency light and frequency doubled light is vertical, and after by N, fundamental frequency light
Loss very little passes through, and frequency doubled light just reflects pop-up laser resonator by N.Fundamental frequency light back in cavity again by D2 to A1 again
It is secondary to continue to amplify by gain crystal.The frequency doubled light being wherein emitted controls its light direction, the laser warp of output by h reflex mirror
The reflection of the parts I is crossed to proceed to K and measure, it is most of to be propagated through I.Distance between wherein (D1) E, (D2) E, (D1)
A1, (D2) (A2), the distance between AB are determined according to laser cavity design requirement, distance between usual (D1) E, (D2) E
It is less than the distance between (D1) A1, (D2) (A2), the distance between AB is not distinctly claimed, and usually distance is shorter to pump
Power it is higher.The distance between A2 to N is normally controlled in the rayleigh range of laser.The positions of C in the cavity do not have
It is distinctly claimed, is generally positioned at laser beam spot sizes and is less than the acousto-optic crsytal zone of action.A1 is positioned on G, the length master of G
If determined by laser design, realize that pulsewidth is consistent in higher frequency range if necessary, then extended length, still
Corresponding machine adds difficulty to increase.The position of rest part is not distinctly claimed.
The back mirror A1 of the first laser device is placed on motorized precision translation stage G, after changing first laser device
The position of speculum A1 changes the length of laser cavity；The back mirror A1 of the first laser device, second laser it is rear anti-
It penetrates between mirror A2 and is disposed with planoconvex spotlight B, the first acousto-optic Q-switching C, second laser hysteroscope D2, laser crystal E, first swashs
Optical cavity mirror D1, the second acousto-optic Q-switching F, polarizing film N, frequency-doubling crystal M.
Wherein, further include motor servo driver J, the motor servo driver J is communicated to connect with MCU control panels U, institute
State the servo motor of motor servo driver J control motorized precision translation stages G.
Wherein, further include MCU control panels U, acousto-optic Q-switching driving Q and pulsewidth monitoring device L, green reflection mirror H, divide
Beam mirror I, photoelectric probe K, the green reflection mirror H propagate laser to beam splitter I, and photoelectric probe K, which passes through, receives beam splitting
The light that mirror I is propagated, is used for the pulsewidth of testing laser device, while giving data measured Real-time Feedback to pulsewidth monitoring device L, described
The MCU control panels U and pulsewidth monitoring device L, acousto-optic Q-switching driving Q communication connections, the acousto-optic Q-switching drive Q and first
Acousto-optic Q-switching C, the second acousto-optic Q-switching F control connections.
Correspondingly, the present invention also provides a kind of fixed pulse width intracavity frequency doubling green (light) laser operating methods.
It should be noted that first laser hysteroscope D1, second laser hysteroscope D2 in the application be average speculum or
Plano-convex speculum, since pump power is relatively high, so in order to supplement the fuel factor of high power pump, so being reflected using plano-convex
Mirror.The chamber of entire laser grows the length between two eyeglasses A1, A2 and determines that wherein A1 is placed on motorized precision translation stage G, passes through
Change the position of A1 to change the length of laser cavity, to change pulsewidth.B is convex lens, and the main function of B is to change laser
Steady area's range of device work, in the range of can the first of laser works the steady area being moved to short focus when placing B, this
Sample can pump higher pump power in limited chamber length.E is corresponding laser work crystal, usual to realize high work
Yttrium vanadate crystal is selected when efficiency, in order to realize good shg efficiency and processing effect, chooses the mode of end pump pumping.
C, F are acousto-optic Q crystal, and the main laser output for just being used for realizing Gao Zhongying, M is frequency-doubling crystal, is arranged in laser cavity, is led to
LBO can be often selected, the crystal such as KDP, in order to consider that industrial customer uses, it is work to generally select the best LBO of moisture protection
Crystal, N are polarizing film, and major function is that fundamental frequency light is allowed to penetrate, and frequency doubled light is allowed to reflect laser cavity.H is green reflection mirror, mainly
Control light direction.
Entire laser pumps to realize in height to realize that double-ended pump design scheme may be used in high pump power
Under the conditions of Pu, the pulsewidths constant of different frequency can be realized by changing chamber length.It is different under identical pump power
Working frequency, the energy accumulated on upper energy level is just different, according to laser rate equation, corresponding arteries and veins when energy accumulation is few
Wide just wide, corresponding pulsewidth is with regard to narrow when energy accumulation is more.So when low repetition, A1 is in the distalmost end of G, i.e. optics cavity
When longest, at this time optical gain is maximum and light path longest, when Gao Zhongying A1 the most proximal end of G, i.e. optics cavity most
When short, optical gain is minimum and light path is most short, and after frequency increases, the gain of corresponding crystal is reduced by, while pulsewidth
It is inversely proportional with gain and chamber length is directly proportional, so two reverse operatings can ensure laser pulse width in low-power Gao Zhongying and height
It is approximate consistent when the low repetition of power.Wherein the main function of B is exactly that thermal focal can be made to be in steady during A1 is moved
The centre in area, the stability that can use laser in this way relative to heat and machinery is optimal, can be by A1 since machine error is to swashing
The interference that light generates minimizes.The length of G be it is limited, usually according to steady area the considerations of, usually in industrial goods laser
In design, pulse pulsewidth in 50kHz~100kHz is constant to meet corresponding application requirement substantially.
G be corresponding motorized precision translation stage, and J be corresponding backstage drive motor driver, wherein the action step of G by
The internal processes of MCU control panels are controlled.
Said program realizes coarse adjustment pulsewidth scheme substantially, and fine-tuning pulsewidth can be by adjusting the switch time of Q come real
It is existing.It is propagated from the laser after h reflex to I, I is beam splitter, and wherein most transmissive has part light reflection to enter light
Electric probe K, photoelectric probe K are mainly used for the pulsewidth of testing laser device, while giving data measured Real-time Feedback to monitoring device L,
Monitoring device L and MCU control panel is in communication with each other, using the software program in the high speed characteristics compiling MCU plates U of FPGA, so just
The logical action process of MCU plates can be controlled.After receiving signal in L, the program in MCU plates carries out real-time measurements
Judge, when pulsewidth exceeds certain range, MCU plates send out energy storage width adjusting order to Q, by the product for adjusting laser
Prime factor realizes the control to the pulsewidth of laser.
The pulsewidth that laser can accurately be controlled by closed loop feedback control in this way, to which the light extraction precision for reaching high is wanted
It asks.
Due to design it is wherein high power end-face pump green light laser, leakage is easy tod produce when gain pump is high
Optical phenomenon, or it is not easy latching light when chamber length is shorter, being primarily due to the operation principle that acousto-optic Q opens the light is
It is acted on using optical grating diffraction, and there is certain diffraction efficiency under diffraction, although the diffraction efficiency of good acousto-optic Q drivings
90% or more can be reached, but still have part light to be propagated according to former road, when the gain in laser cavity is excessively high, even if
Very weak light can also form laser.So in order to turn off laser, continuous green is not generated privately, is driven using two acousto-optic Q
Shutdown design is carried out, wherein C is the main action adjusted Q acoustooptic switch, be Q is adjusted in realization when normal work, and supplemented by F
Help acousto-optic Q-switching, when C is worked normally, F does not have a radio-frequency power, and such F is equivalent to transparent crystal, adjust Q work by C Lai
It completes, and simple C does not turn off laser when laser shutdown, so F also increases radio-frequency power and works simultaneously,
Two such acousto-optic crsytal works at the same time the shutdown effect that can reach laser cavity.
The fixed end-face pump green light laser of the pulsewidth of technical grade can be realized by optimization design.
The above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of fixed pulse width intracavity frequency doubling green (light) laser, which is characterized in that back mirror (A1) including first laser device,
Back mirror (A2), planoconvex spotlight (B) and the first acousto-optic Q-switching (C) of second laser, first laser hysteroscope (D1),
Dual-laser hysteroscope (D2), laser crystal (E), the second acousto-optic Q-switching (F), polarizing film (N), frequency-doubling crystal (M),
The back mirror (A1) of the first laser device is placed on motorized precision translation stage (G), after changing first laser device
The position of speculum (A1) changes the length of laser cavity；The back mirror (A1) of the first laser device, second laser
Planoconvex spotlight (B), the first acousto-optic Q-switching (C), second laser hysteroscope (D2), laser are disposed between back mirror (A2)
Crystal (E), first laser hysteroscope (D1), the second acousto-optic Q-switching (F), polarizing film (N), frequency-doubling crystal (M).
2. fixed pulse width intracavity frequency doubling green (light) laser according to claim 1, which is characterized in that further include servo motor
Driver (J), the motor servo driver (J) communicate to connect with MCU control panels (U), motor servo driver (J) control
The servo motor of motorized precision translation stage (G) processed.
3. fixed pulse width intracavity frequency doubling green (light) laser according to claim 1, which is characterized in that further include MCU controls
Plate (U), acousto-optic Q-switching driving (Q) and pulsewidth monitoring device (L), green reflection mirror (H), beam splitter (I), photoelectric probe
(K), the green reflection mirror (H) propagates laser to beam splitter (I), and photoelectric probe (K) is passed by receiving beam splitter (I)
The light broadcast is used for the pulsewidth of testing laser device, while giving data measured Real-time Feedback to pulsewidth monitoring device (L), the MCU controls
Making sheet (U) and the pulsewidth monitoring device (L), acousto-optic Q-switching driving (Q) communication connection, the acousto-optic Q-switching driving (Q) with
First acousto-optic Q-switching (C), the second acousto-optic Q-switching (F) control connection.
4. fixed pulse width intracavity frequency doubling green (light) laser according to any one of claim 1-3, which is characterized in that described
First laser hysteroscope (D1) and second laser hysteroscope (D2) are plano-convex speculum or average eyeglass.
5. fixed pulse width intracavity frequency doubling green (light) laser according to any one of claim 1-3, which is characterized in that laser
Crystal (E) is yttrium vanadate crystal.
6. a kind of fixed pulse width intracavity frequency doubling green (light) laser operating method, which is characterized in that the laser includes first sharp
The back mirror (A1) of light device, the back mirror (A2) of second laser, planoconvex spotlight (B) and the first acousto-optic Q-switching (C),
First laser hysteroscope (D1), second laser hysteroscope (D2), laser crystal (E), the second acousto-optic Q-switching (F), polarizing film (N), frequency multiplication
Crystal (M),
The back mirror (A1) of the first laser device is placed on motorized precision translation stage (G), after changing first laser device
The position of speculum (A1) changes the length of laser cavity；The back mirror (A1) of the first laser device, second laser
Planoconvex spotlight (B), the first acousto-optic Q-switching (C), second laser hysteroscope (D2), laser are disposed between back mirror (A2)
Crystal (E), first laser hysteroscope (D1), the second acousto-optic Q-switching (F), polarizing film (N), frequency-doubling crystal (M).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810388786.7A CN108448375A (en) | 2018-04-27 | 2018-04-27 | Fixed pulse width intracavity frequency doubling green (light) laser and operating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810388786.7A CN108448375A (en) | 2018-04-27 | 2018-04-27 | Fixed pulse width intracavity frequency doubling green (light) laser and operating method |
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| CN101090193A (en) * | 2006-06-13 | 2007-12-19 | 北京国科世纪激光技术有限公司 | Laser capable of regulating pulsewidth |
| WO2008017214A1 (en) * | 2006-08-04 | 2008-02-14 | Shenzhen Han's Laser Technology Co., Limited | A method for generating a fourth harmonic solid laser |
| CN208522245U (en) * | 2018-04-27 | 2019-02-19 | 国科世纪激光技术（天津）有限公司 | Fixed pulse width intracavity frequency doubling green (light) laser |
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| US20020024978A1 (en) * | 2000-08-28 | 2002-02-28 | Yoshihiko Inagaki | Laser device and seed light optimization method |
| CN101090193A (en) * | 2006-06-13 | 2007-12-19 | 北京国科世纪激光技术有限公司 | Laser capable of regulating pulsewidth |
| WO2008017214A1 (en) * | 2006-08-04 | 2008-02-14 | Shenzhen Han's Laser Technology Co., Limited | A method for generating a fourth harmonic solid laser |
| CN208522245U (en) * | 2018-04-27 | 2019-02-19 | 国科世纪激光技术（天津）有限公司 | Fixed pulse width intracavity frequency doubling green (light) laser |
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