CN105486483B - Multi-pulse laser beam combining method based on space-time multiplexing technology - Google Patents
Multi-pulse laser beam combining method based on space-time multiplexing technology Download PDFInfo
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- CN105486483B CN105486483B CN201610016134.1A CN201610016134A CN105486483B CN 105486483 B CN105486483 B CN 105486483B CN 201610016134 A CN201610016134 A CN 201610016134A CN 105486483 B CN105486483 B CN 105486483B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
Abstract
The invention provides the multi-pulse laser beam combining method based on space-time multiplexing technology, methods described includes：Using the first via laser pulse direction of propagation as optical axis, second, third ... N+1 roads laser pulse passes sequentially through first, second ..., and n-th skyplex is coupled into light path from perpendicular to optical axis direction；The N+1 laser pulses that second, third made by the posture for adjusting N number of skyplex ... and the complete common optical axis of first via laser pulse；N time multiplexer that the light of first, second ... N skyplexs output respectively enters first, second ..., described first, second ... N time multiplexer produces a pulse signal respectively, the polarization for the N+1 laser pulses that adjust second, third ..., make it consistent with first laser pulse polarization；Finally, N time multiplexer exports a branch of laser for containing N+1 pulse with optical axis completely.The present invention realizes the lossless light beam synthesis of multiple-pulse, reduces the complexity of more laser space combinations, and reliability greatly improves.
Description
Technical field
The present invention relates to multiple-pulse speed particle imaging technique, swash more particularly to the multiple-pulse based on space-time multiplexing technology
Light beam combining method.
Background technology
In the various researchs measurement of burning, jet flow and other air sky mechanics and hydraulics, generally use speed
Spend particle imaging technique (Particle Image Velocimetry, PIV) measuring system.PIV technologies are in FLOW VISUALIZATION skill
On the basis of art, a kind of new flow measurement technology for being grown up using image processing techniques；By track trace particle come
Judge the size and Orientation of speed.PIV technologies modern fluid mechanics is studied and the supportive of substantial industrial hydrodynamics experiment is real
Test technological means.Although PIV e measurement technologies have become the standard set-up of experimental fluid mechanics research, if but the technology still deposit
Dry weight wants technology to limit to, it is difficult to meets some great demands of hydrodynamic calculations research, these limitations mainly include：In face
In application study to Important Project demand, restricted by fluid three-dimensional motion characteristic, the noise of double-exposure routine PIV systems
Be greatly limited than disposal ability, this some typical eddy flows, flow to the fluidal textures such as whirlpool measurement in, limitation is very big；
Traditional PIV e measurement technologies use dipulse sheet laser laser, suitable for the low situation of particle concentration, to be obtained as illuminator
The spatial resolution of the velocity vector field arrived is also very low.When particle concentration is high, particle image can overlap, and can not obtain solely
Vertical particle image；Exposed using dipulse, be only capable of obtaining certain flashy speed field distribution, and can not obtain one section it is continuous anti-
Answer dynamic (dynamical) evolution process.There is an urgent need to significant innovation, more exposures are carried out to traditional PI V systems technologies structure for above mentioned problem
PIV technologies are the key technology directions to solve the above problems.
Substitute the dual pulse welding in PIV measuring systems with multiple pulse laser, when measuring high concentrations of particles, use
The method that traditional multiple pulse laser multi-Level Orthogonal Polarization Method synthesizes step by step, follow-up each synthesis link can cause 50% energy to damage
Lose.By taking 8 pulse lasers as an example, 3 follow-up synthesis links are shared, capacity usage ratio is low, and only about 20%.And system is answered
Miscellaneous, the adjustment of multiple-pulse common optical axis is difficult.As shown in Figure 1.The polarization state of 1# laser pulses and 2# laser pulses is horizontal direction, 3#
The polarization state of laser pulse and 4# laser pulses is vertical direction, by polarized combination device analyzing, is polarized and closed by fine adjustment
To grow up to be a useful person after synthesis, the polarization state of 1#, 2# laser pulse is horizontal direction, and the polarization state of 3#, 4# laser pulse is vertical direction, when
Between after arriving first be 1#, 2#, 3#, 4#.Using identical method, 5#, 6#, 7#, 8# laser coaxial can be synthesized.In order to allow 8 tunnels
Laser coaxial, it is different from previous stage polarized combination we term it second level polarized combination still using the method for polarized combination
Be to need first by horizontal and vertical polarization state while to rotate 45 ° of directions with light polarization modulator, by polarized combination device analyzing,
1#, 2#, 3#, 4# laser pulse pass through polarization synthesizer by Orthogonal Decomposition, 50% energy.5#, 6#, 7#, 8# laser pulse
By Orthogonal Decomposition, the laser of vertical separation is reflected, after reflection with the same optical axis of 1#, 2#, 3#, 4# laser pulse.After synthesis
1#, 2#, 3#, 4# laser pulse polarization state are level, and 5#, 6#, 7#, 8# laser pulse polarization state are vertical.In order to allow after synthesis
The polarization states of eight road laser pulses be horizontal or vertical direction, it is necessary to light polarization modulator that horizontal and vertical polarization state is same
45 ° of directions of Shi Xuanzhuan, finally with analyzer, horizontally or vertically analyzing exports, as a result of the method for Orthogonal Decomposition, each road light
Transmitance be 50%.Exported by first time polarized combination, second of polarized combination and final analyzing, eight road laser arteries and veins
Punch complete coaxial, polarization state is also completely the same, and the time is 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8# after arriving first.Polarize for the first time
The efficiency of synthesis is 100%, and in second of polarized combination, the energy on each road loses 50% again, and the efficiency of final stage analyzing is
50%.In view of every grade of polarized combination device transmitance it is actual be 95%, overall combined coefficient is about 20% (95% × 50%
× 95% × 50% × 95% ≈ 21.4%).
The content of the invention
It is an object of the invention to solve existing multi-Level Orthogonal Polarization Method step by step existing for the method for synthetic laser it is above-mentioned
Problem, it is proposed that the multi-pulse laser beam combining method based on space-time multiplexing technology, there is energy using this method synthesis light
The characteristics of utilization rate is high, reliability is high.
In order to achieve the above object, the invention provides the multi-pulse laser light beam synthesis side based on space-time multiplexing technology
Method, methods described realize that the Laser synthesizing device is N number of including being alternately arranged successively along optical axis by Laser synthesizing device
Skyplex and N number of time multiplexer；Methods described includes：Using the direction of propagation of first via laser pulse as optical axis, the
Two tunnels, the 3rd tunnel ... N+1 roads laser pulse pass sequentially through first, second ... n-th skyplex be from perpendicular to light
The direction of axle is coupled into light path；Posture by adjusting N number of skyplex makes the second tunnel, the 3rd tunnel ... N+1 roads laser arteries and veins
Punching and the complete common optical axis of first laser pulse；The light of first, second ... n-th skyplex output respectively enters first
Individual, second ... n-th time multiplexer, described first, second ... n-th time multiplexer produce a pulse respectively
Signal, the second tunnel of adjustment, the polarization of the 3rd tunnel ... N+1 roads laser pulse, makes it consistent with the polarization of first via laser pulse；
Finally, a branch of coaxial laser containing N+1 pulse completely of n-th time multiplexer output；Wherein, parameter N >=3.
In above-mentioned technical proposal, methods described specifically includes：
Step 1) first via laser pulse enters first skyplex along optical axis direction；Hang down on the second road laser pulse edge
Directly enter first skyplex in the direction of optical axis；Second road laser is made by the posture for adjusting first skyplex
Pulse and the complete common optical axis of first via laser pulse；First via laser pulse and the second road laser pulse are along optical axis direction afterwards
First time multiplexer is respectively enterd, first time multiplexer produces a pulse signal, for adjusting the second tunnel
The polarization of laser pulse, make it consistent with the polarization of first via laser pulse；
Step 2) first via laser pulse and the second road laser pulse enter second skyplex along optical axis direction；
3rd road laser pulse enters second skyplex along perpendicular to the direction of optical axis；By adjusting second skyplex
Posture make the 3rd road laser pulse and the complete common optical axis of first via laser pulse；First via laser pulse, the second road laser arteries and veins
Punching and the 3rd road laser pulse respectively enter second time multiplexer, second time multiplexer production along optical axis direction
A raw pulse signal, for adjusting the polarization of the 3rd road laser pulse, makes it consistent with the polarization of first via laser pulse；
Step 3) the like；First via laser pulse, the second road laser pulse ... and N roads laser pulse is along light
Direction of principal axis enters n-th skyplex；N+1 roads laser pulse enters n-th spatial reuse along perpendicular to the direction of optical axis
Device；Posture by adjusting n-th skyplex makes N+1 roads laser pulse and the complete common optical axis of first via laser pulse；
First via laser pulse, the second road laser pulse ... and N+1 roads laser pulse along optical axis direction respectively enter n-th when
Between multiplexer, the n-th time multiplexer produces a pulse signal, for adjusting the polarization of N+1 roads laser pulse, makes
It is consistent with the polarization of first via laser pulse；
Step 4) the n-th time multiplexer exports a branch of completely coaxial laser beam, contains N+1 in the laser beam
Individual pulse.
The advantage of the invention is that：
1st, when the laser measurement high concentrations of particles synthesized using the method for the present invention is distributed, its measurement accuracy can be improved；
2nd, method of the invention uses the time-multiplexed technology of special space, breaches energy in conventional polarization building-up process and damages
The limitation of half is lost, the efficient light beam synthesis of multiple-pulse is realized, greatly reduces the complexity of multi-path laser space combination, can
Greatly improved by property；
3rd, method of the invention employs the time-multiplexed technology of high-precision multiplex pulse so that pulse spacing precision reaches
0.5ns, guarantee is provided to improve measurement accuracy；
4th, method of the invention uses N+1 space time multiplexing technologies, can not only conveniently realize the lossless light beam of 8 pulses
Synthesis, moreover it is possible to unlimited extension to 16 pulses and 32 pulses, possibility is provided for more High Mach number flow field survey；
5th, the coaxial laser beam synthesized by the method for the present invention is high, reaches μ rad magnitudes；Each input laser letter
Number energy Independent adjustable；The time interval of the laser beam entirety synthesized by the method for the present invention is adjustable；
6th, method of the invention can ensure that the coupling efficiency per laser pulse all the way is more than 95%, can realize lossless
Space combination；
7th, method of the invention is pointed to equal as optical axis benchmark, other laser pulses using the space of first via laser pulse
Main optical path can be easily coupled into, the preparation time before experiment can be greatly reduced, effectively improve testing efficiency.
Brief description of the drawings
Fig. 1 is the schematic diagram of existing multi-Level Orthogonal Polarization Method synthetic method step by step；
Fig. 2 is the schematic diagram of the multi-pulse laser beam combining method based on space-time multiplexing technology of the present invention.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 2 the multi-pulse laser beam combining method based on space-time multiplexing technology, methods described include：
Step 1) first via laser pulse enters first skyplex along optical axis direction；Hang down on the second road laser pulse edge
Directly enter first skyplex in the direction of optical axis；Second road laser is made by the posture for adjusting first skyplex
Pulse and the complete common optical axis of first via laser pulse；First via laser pulse and the second road laser pulse are along optical axis direction afterwards
Very first time multiplexer is respectively enterd, first time multiplexer produces a pulse signal, swashs for adjusting the second road
The polarization of light pulse, make it consistent with the polarization of first via laser pulse；
Using the rising edge of first via laser pulse as the time reference of system, when first via laser pulse passes through first
After time multiplexer after Δ t, the second road laser pulse is coupled into time shaft by first time multiplexer, is transmitted along main optical path.
Step 2) first via laser pulse and the second road laser pulse enter second skyplex along optical axis direction；
3rd road laser pulse enters second skyplex along perpendicular to the direction of optical axis；By adjusting second skyplex
Posture make the 3rd road laser pulse and the complete common optical axis of first via laser pulse；First via laser pulse, the second road laser arteries and veins
Punching and the 3rd road laser pulse respectively enter second time multiplexer along optical axis direction, and second time multiplexer produces
One pulse signal, for adjusting the polarization of the 3rd road laser pulse, make it consistent with the polarization of first via laser pulse；
Step 3) the like；First via laser pulse, the second road laser pulse ... and N roads laser pulse is along light
Direction of principal axis enters n-th skyplex；N+1 roads laser pulse enters n-th spatial reuse along perpendicular to the direction of optical axis
Device；Posture by adjusting n-th skyplex makes N+1 roads laser pulse and the complete common optical axis of first via laser pulse；
First via laser pulse, the second road laser pulse ... and N+1 roads laser pulse along optical axis direction respectively enter n-th when
Between multiplexer, the n-th time multiplexer produces a pulse signal, for adjusting the polarization of N+1 roads laser pulse, makes
It is consistent with the polarization of first via laser pulse；
Parameter N >=3；
Step 4) the n-th time multiplexer exports a branch of completely coaxial laser beam, contains N+1 in the laser beam
Individual pulse.
The N+1 roads laser pulse inputted in methods described is the laser pulse of any wavelength.
Preferably, first skyplex, second skyplex ... n-th skyplex are polarization point
Light prism；First time multiplexer, second time multiplexer ... n-th time multiplexer are modulator.
It should be noted last that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those within the art that, to the technical side of the present invention
Case is modified or equivalent substitution, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right among.
Claims (2)
1. the multi-pulse laser beam combining method based on space-time multiplexing technology, methods described are realized by Laser synthesizing device,
The Laser synthesizing device includes the N number of skyplex being alternately arranged successively along optical axis and N number of time multiplexer；The side
Method includes：Using the direction of propagation of first via laser pulse as optical axis, the second tunnel, the 3rd tunnel ... N+1 roads laser pulse are successively
Light path is coupled into from the direction perpendicular to optical axis by first, second ... n-th skyplex；By adjusting N number of sky
Between the posture of multiplexer make the second tunnel, the 3rd tunnel ... N+1 roads laser pulse and the complete common optical axis of first via laser pulse；First
Individual, second ... n-th skyplex output light respectively enters first, second ... n-th time multiplexer, described
First, second ... n-th time multiplexer produce a pulse signal respectively, the second tunnel of adjustment, the 3rd tunnel ... N+1 roads
The polarization of laser pulse, make second tunnel, the 3rd tunnel ... N+1 roads laser pulse polarization and first via laser pulse it is inclined
Shake consistent；Finally, a branch of coaxial laser containing N+1 pulse completely of n-th time multiplexer output；Wherein, parameter N >=
3。
2. the multi-pulse laser beam combining method according to claim 1 based on space-time multiplexing technology, it is characterised in that
Methods described specifically includes：
Step 1) first via laser pulse enters first skyplex along optical axis direction；Second road laser pulse along perpendicular to
The direction of optical axis enters first skyplex；Second road laser pulse is made by the posture for adjusting first skyplex
With the complete common optical axis of first via laser pulse；First via laser pulse is distinguished with the second road laser pulse along optical axis direction afterwards
Into first time multiplexer, first time multiplexer produces a pulse signal, for adjusting the second road laser
The polarization of pulse, make it consistent with the polarization of first via laser pulse；
Step 2) first via laser pulse and the second road laser pulse enter second skyplex along optical axis direction；3rd
Road laser pulse enters second skyplex along perpendicular to the direction of optical axis；By the appearance for adjusting second skyplex
State makes the 3rd road laser pulse and the complete common optical axis of first via laser pulse；First via laser pulse, the second road laser pulse and
3rd road laser pulse respectively enters second time multiplexer along optical axis direction, and second time multiplexer produces one
Individual pulse signal, for adjusting the polarization of the 3rd road laser pulse, make it consistent with the polarization of first via laser pulse；
Step 3) the like；First via laser pulse, the second road laser pulse ... and N roads laser pulse is along optical axis side
To entrance n-th skyplex；N+1 roads laser pulse enters n-th skyplex along perpendicular to the direction of optical axis；It is logical
Overregulating the posture of n-th skyplex makes N+1 roads laser pulse and the complete common optical axis of first via laser pulse；The first via
Laser pulse, the second road laser pulse ... and along optical axis direction to respectively enter n-th time-multiplexed for N+1 roads laser pulse
Device, the n-th time multiplexer produce a pulse signal, for adjusting the polarization of N+1 roads laser pulse, make itself and the
The polarization of laser pulse is consistent all the way；
Step 4) the n-th time multiplexer exports a branch of completely coaxial laser beam, contains N+1 arteries and veins in the laser beam
Punching.
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| US5111322A (en) * | 1991-04-04 | 1992-05-05 | At&T Bell Laboratories | Polarization multiplexing device with solitons and method using same |
| CN1031532C (en) * | 1993-08-18 | 1996-04-10 | 核工业理化工程研究院 | Laser beam combining unit |
| US7298771B2 (en) * | 2003-07-03 | 2007-11-20 | Pd-Ld, Inc. | Use of volume Bragg gratings for the conditioning of laser emission characteristics |
| CN101571612B (en) * | 2004-02-02 | 2012-12-26 | 中国科学技术大学 | Polarization controlling encoder |
| CN1284149C (en) * | 2004-03-04 | 2006-11-08 | 清华大学 | Polarization orthogonal double-channel holographic optical data storage method and its system |
| CN1873466A (en) * | 2005-05-30 | 2006-12-06 | 成序三 | Optical system for synthesizing multi laser beams and method |
| CN101382665A (en) * | 2008-10-24 | 2009-03-11 | 中国科学院上海光学精密机械研究所 | Coaxial synthesizing method for coherent beam |
| CN102589857A (en) * | 2012-03-08 | 2012-07-18 | 哈尔滨工业大学 | Method and device for measuring distributed-type polarization maintaining optical fiber double refraction based on Brillouin dynamic grating |
| CN102801097B (en) * | 2012-08-28 | 2014-11-26 | 北京敏视达雷达有限公司 | Laser device and method for outputting laser |
| CN103033944A (en) * | 2012-12-04 | 2013-04-10 | 广东汉唐量子光电科技有限公司 | Polarization beam-combination device for pulsed laser |
| CN103199434B (en) * | 2013-03-04 | 2015-09-09 | 中国科学院长春光学精密机械与物理研究所 | A kind of method realizing semiconductor laser coherent polarization synthesis |
| CN104049375B (en) * | 2014-06-05 | 2016-02-24 | 华中科技大学 | A kind of polarization independent space light modulating method and device |
| CN104767118A (en) * | 2015-01-22 | 2015-07-08 | 北京凯普林光电科技有限公司 | Optical fiber coupling semiconductor laser device |
| CN104656266B (en) * | 2015-02-10 | 2017-02-01 | 北京理工大学 | Method and device for synthesizing vector light beam through polarization based on Twyman Green interferometer |
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