CN108521071A - Different frequency fixed pulse width solid state laser and operating method - Google Patents
Different frequency fixed pulse width solid state laser and operating method Download PDFInfo
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- CN108521071A CN108521071A CN201810388816.4A CN201810388816A CN108521071A CN 108521071 A CN108521071 A CN 108521071A CN 201810388816 A CN201810388816 A CN 201810388816A CN 108521071 A CN108521071 A CN 108521071A
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- laser
- solid state
- pulse width
- different frequency
- back mirror
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- 239000007787 solid Substances 0.000 title claims abstract description 21
- 238000011017 operating method Methods 0.000 title claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 14
- 238000013519 translation Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- QWVYNEUUYROOSZ-UHFFFAOYSA-N trioxido(oxo)vanadium;yttrium(3+) Chemical group [Y+3].[O-][V]([O-])([O-])=O QWVYNEUUYROOSZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 101100456571 Mus musculus Med12 gene Proteins 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Classifications
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
- H01S3/1394—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length by using an active reference, e.g. second laser, klystron or other standard frequency source
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of different frequency fixed pulse width solid state laser and operating methods, the outgoing mirror F of back mirror A, planoconvex spotlight B and low pass filter C, laser crystal D, acousto-optic Q-switching E, laser including laser, the back mirror A of the laser is placed on motorized precision translation stage on H, changes the length of laser cavity by the position of the back mirror A of change laser.The present invention provides the solid state lasers of a pulsewidths constant, it can ensure the invariance of pulsewidth in certain frequency range, highest pump power can be used either under low repetition and under Gao Zhongying simultaneously, either can realize highest energy output in low repetition or Gao Zhongying in this way.
Description
Technical field
The present invention relates to field of laser device technology, more particularly to a kind of different frequency fixed pulse width solid state 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 usually changes with the change that pump power, q-frequency, chamber are grown.For not having
Have carry out MOPA solid state laser, if the pulsewidth of light extraction is allowed to remain unchanged, usually can by thus the parameter of laser all
It records, by controlling pump power, goes out light frequency to make the pulsewidth of laser be consistent, but usually such case needs
To be dressed to worst situation, be with pump power highest, go out light frequency it is highest when pulsewidth on the basis of, when going out optical frequency
When rate declines, the power for reducing pump light is needed, laser pulse width and Gao Zhongying are high in this way under the low pump power of low repetition
Pulsewidth under pump power is approximate consistent.It is done so that maximum problem is exactly that pump power under low repetition is relatively low, go out
Light energy is relatively low, and what is become in this way is nonsensical.
Invention content
Technical problem present in for the above-mentioned prior art, it is solid that the object of the present invention is to provide different frequency fixed pulse widths
Body laser and operating method.
To achieve the purpose of the present invention, the present invention provides a kind of different frequency fixed pulse width solid state laser, features
It is, including the back mirror A of laser, planoconvex spotlight B and low pass filter C, laser crystal D, acousto-optic Q-switching E, laser
The outgoing mirror F of device,
The back mirror A of the laser is placed on motorized precision translation stage on H, by the back mirror A for changing laser
Position change the length of laser cavity.
Correspondingly, the present invention also provides a kind of different frequency fixed pulse width solid state laser operating methods, including laser
Back mirror A, planoconvex spotlight B and the low pass filter C of device, the outgoing mirror F of laser crystal D, acousto-optic Q-switching E, laser,
The back mirror A of the laser is placed on motorized precision translation stage on H, by the back mirror A for changing laser
Position change the length of laser cavity.
Compared with prior art, beneficial effects of the present invention are to provide the solid state laser of a pulsewidths constant, one
It can ensure the invariance of pulsewidth in fixed frequency range, while can be used most either under low repetition and under Gao Zhongying
High pump power either can realize highest energy output in low repetition or Gao Zhongying in this way.
Description of the drawings
Fig. 1 show the structural schematic diagram of the application；
In figure, the back mirror of A- lasers, B- planoconvex spotlights, C- low pass filters, D- laser crystals, E- acousto-optics Q opens
It closes, the outgoing mirror of F- lasers, G- beam splitters, I- photoelectric probes, H- motorized precision translation stages, J- motor servo drivers, K- acousto-optics Q
Driving, L- power monitor devices, M-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 in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
This application provides the solid state laser of a pulsewidths constant, so-called pulsewidths constant is in certain frequency range
The interior invariance that can ensure pulsewidth, while either under low repetition and highest pumping work(can be used under Gao Zhongying
Rate either can realize highest energy output in low repetition or Gao Zhongying in this way.Pulsed constant laser is mainly answered
For cavity external frequency multiplication, uv-exposure, pcb board cutting, the environment stringenter to pulsewidth requirement such as integrated circuit exposure, while profit
The advantages that the characteristics of pumping pump laser with end, optical quality is excellent, and energy conversion efficiency is high, it is widely used in industrial part
Mark, drilling, scribing, welding, cutting and medical instrument micro Process, electronic package, micro-component stereo shaping
Deng.
As shown in Figure 1, a kind of different frequency fixed pulse width solid state laser of the application, including the back mirror A of laser,
The outgoing mirror F of planoconvex spotlight B and low pass filter C, laser crystal D, acousto-optic Q-switching E, laser,
Wherein ABCDEF is expressed as the cavity composition of solid state laser, and whole laser has been reduced to the parts ABCDEF group
At, but it is not only limited to the combination of this cavity, the laser of other Complex Situations also complies with respective design requirement.The A in the design
For the back mirror in laser, F is laser outgoing mirror, and laser is propagated by A through BCDE to F in laser chamber body,
After the positions F laser part reflective portion transmits, transmissive portion forms laser output, and another part returns in cavity again by F
Continue to amplify again by gain crystal to A.Distance between wherein CD, CF, CA, the distance between AB are designed according to laser cavity
It is required that being determined, distance is less than the distance between CF, CA between usual CD, and the distance between AB is not distinctly claimed, and leads to
Often the shorter power that can be pumped of distance is higher.The positions of E in the cavity are generally positioned at laser beam spot sizes and are less than acousto-optic
The crystal zone of action.Laser is exported in the positions F after laser coelosis, the laser of output enters I after the parts G are reflected
It measures, remaining is largely propagated through G.A is positioned on H, and the length of H is mainly to have the design of laser to determine
, realize that pulsewidth is consistent in higher frequency range if necessary, then its extended length, but corresponding machine adds difficulty to increase.
The position of rest part is not distinctly claimed.
Correspondingly, the present invention also provides a kind of different frequency fixed pulse width solid state laser operating methods.
The back mirror A of the laser is placed on motorized precision translation stage on H, by the back mirror A for changing laser
Position change the length of laser cavity.
Wherein, further include beam splitter G, photoelectric probe I and MCU control panel M, power monitor device L, beam splitter G reflections
The light of the laser of the outgoing mirror F outputs of laser, beam splitter G reflections enters photoelectric probe I, the photoelectric probe I for testing
The pulsewidth of laser, while giving power monitor device L, the power monitor device L and MCU to control data measured Real-time Feedback
Plate M is in communication with each other.
Wherein, MCU control panels M and motor servo driver J, acousto-optic Q drivings K connects, the motor servo driver J and
The Serve Motor Control connection of H on motorized precision translation stage, the acousto-optic Q driving K are connected with acousto-optic Q-switching E controls.
It should be noted that
C is average speculum or plano-convex speculum, since pump power is relatively high, so in order to supplement high power pump
Fuel factor, so using plano-convex speculum.The chamber length of entire laser is determined that wherein A is placed into electronic by the length of A to F
On translation stage H, change the length of laser cavity by changing the position of A, to change pulsewidth.B is convex lens, the main work of B
With the steady area's range for being change laser works, the first of laser works the steady area can be moved to when placing B
In the range of short focus, higher pump power can be pumped in limited chamber length in this way.D is corresponding laser work crystal,
Yttrium vanadate crystal is selected generally for when realizing high working efficiency, is imitated here in order to realize good shg efficiency and process
Fruit chooses the mode of end pump pumping.E is acousto-optic Q crystal, and the main laser output for just being used for realizing Gao Zhongying, F is laser
Outgoing mirror can select optimal transmitance according to the size of output energy.
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, A is in the distalmost end of H, i.e. optics cavity
When longest, at this time optical gain is maximum and light path longest, and A is most short in the most proximal end of H, i.e. optics cavity when Gao Zhongying
When, optical gain is minimum and light path is most short, and due to pulsewidth and gain is inversely proportional and chamber length is directly proportional, so two are reversed
Operation can ensure that laser pulse width is approximate consistent in the repetition low with high power of low-power Gao Zhongying.The wherein main function of B
It so that thermal focal is in the centre in steady area during A is moved, laser can be used in this way relative to heat and machinery
Stability it is optimal, A can be minimized due to the interference that machine error generates laser.The length of H be it is limited, usually
The length of the considerations of according to steady area, H are determined by B, so the length of H just determines the constant upper frequency limit of pulsewidth, are usually existed
In the design of industrial goods laser, pulse pulsewidth in 50kHz~100kHz it is constant it is basic can meet to apply accordingly want
It asks.
H be corresponding motorized precision translation stage, and J be corresponding backstage drive motor driver, wherein the action step of H by
The internal processes of MCU plates M are controlled.
Said program realizes the scheme of pulsewidth consistency substantially, but since A not only needs to consider in moving process
The factor of chamber length, will more consider the factor of deep stability, so going out pulsewidth approximately equal in A moving process.What is exported from F swashs
When light is by beam splitter G, most of transmissive has part light reflection to enter photoelectric probe I, and photoelectric probe I is mainly used
Power monitor device L, power monitor device L and MCU plate are given in the pulsewidth of testing laser device, while by data measured Real-time Feedback
M is in communication with each other, and using the software program in the high speed characteristics compiling MCU plates M of FPGA, can control the logic of MCU plates in this way
Action process.After receiving signal in power monitor device L, the program in MCU plates judges real-time measurements, when
When pulsewidth exceeds certain range, MCU plates send out energy storage width adjusting order to acousto-optic Q drivings K, by adjusting laser
Quality factor realize the control to the pulsewidth of laser.
The pulsewidth that laser can be accurately controlled by closed loop feedback control, to reach high light extraction required precision.
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 (5)
1. a kind of different frequency fixed pulse width solid state laser, which is characterized in that the back mirror (A) including laser, plano-convex
The outgoing mirror (F) of lens (B) and low pass filter (C), laser crystal (D), acousto-optic Q-switching (E), laser,
The back mirror (A) of the laser is placed on motorized precision translation stage on (H), by the back mirror for changing laser
(A) position changes the length of laser cavity.
2. different frequency fixed pulse width solid state laser according to claim 1, which is characterized in that further include beam splitter
(G), photoelectric probe (I) and MCU control panels (M), power monitor device (L), the outgoing mirror of beam splitter (G) reflection laser
(F) light of the laser exported, beam splitter (G) reflection enters photoelectric probe (I), and the photoelectric probe (I) is used for testing laser device
Pulsewidth, while giving data measured Real-time Feedback to power monitor device (L), the power monitor device (L) and MCU control panels
(M) it is in communication with each other.
3. different frequency fixed pulse width solid state laser according to claim 2, which is characterized in that MCU control panels (M) and
Motor servo driver (J), acousto-optic Q driving (K) connection, the motor servo driver (J) are watched with (H) on motorized precision translation stage
Motor control connection is taken, the acousto-optic Q drivings (K) connect with acousto-optic Q-switching (E) control.
4. different frequency fixed pulse width solid state laser according to claim 1, which is characterized in that the laser crystal
(D) it is yttrium vanadate crystal.
5. a kind of different frequency fixed pulse width solid state laser operating method, which is characterized in that the laser includes laser
Back mirror (A), planoconvex spotlight (B) and low pass filter (C), laser crystal (D), acousto-optic Q-switching (E), laser
Outgoing mirror (F),
The back mirror (A) of the laser is placed on motorized precision translation stage on (H), by the back mirror for changing laser
(A) position changes the length of laser cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810388816.4A CN108521071A (en) | 2018-04-27 | 2018-04-27 | Different frequency fixed pulse width solid state laser and operating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810388816.4A CN108521071A (en) | 2018-04-27 | 2018-04-27 | Different frequency fixed pulse width solid state laser and operating method |
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| Publication Number | Publication Date |
|---|---|
| CN108521071A true CN108521071A (en) | 2018-09-11 |
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|---|---|---|---|
| CN201810388816.4A Pending CN108521071A (en) | 2018-04-27 | 2018-04-27 | Different frequency fixed pulse width solid state laser and operating method |
Country Status (1)
| Country | Link |
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| CN (1) | CN108521071A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020024978A1 (en) * | 2000-08-28 | 2002-02-28 | Yoshihiko Inagaki | Laser device and seed light optimization method |
| WO2008017214A1 (en) * | 2006-08-04 | 2008-02-14 | Shenzhen Han's Laser Technology Co., Limited | A method for generating a fourth harmonic solid laser |
| CN208226292U (en) * | 2018-04-27 | 2018-12-11 | 国科世纪激光技术（天津）有限公司 | Different frequency fixed pulse width solid state laser |
-
2018
- 2018-04-27 CN CN201810388816.4A patent/CN108521071A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020024978A1 (en) * | 2000-08-28 | 2002-02-28 | Yoshihiko Inagaki | Laser device and seed light optimization method |
| WO2008017214A1 (en) * | 2006-08-04 | 2008-02-14 | Shenzhen Han's Laser Technology Co., Limited | A method for generating a fourth harmonic solid laser |
| CN208226292U (en) * | 2018-04-27 | 2018-12-11 | 国科世纪激光技术（天津）有限公司 | Different frequency fixed pulse width solid state laser |
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Application publication date: 20180911 |