CN107248693B - Self-adaptive driving device based on pyramid prism coherent synthesis laser - Google Patents
Self-adaptive driving device based on pyramid prism coherent synthesis laser Download PDFInfo
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- 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
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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
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Abstract
The invention discloses a self-adaptive driving device based on a pyramid prism coherent synthesis laser, which comprises a coherent synthesis laser, a signal acquisition module, a signal processing module, a signal operation module and a signal power amplification module, wherein the coherent synthesis laser comprises a plurality of laser media and pumping sources corresponding to the laser media, each laser medium is arranged between an output mirror and the pyramid prism, laser generated by the laser media is injected into the corresponding laser medium after being reflected by the pyramid prism, and the output mirror outputs coherent laser. The invention improves the control precision, solves the synchronization problem of the multi-path laser coherent synthesis based on the pyramid and improves the coherent synthesis efficiency.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a self-adaptive driving device based on a pyramid prism coherent synthesis laser, which is suitable for the field of driving and controlling multiple paths of lasers.
Background
The high-power laser has important application in the fields of scientific research, industrial processing, military weapons and the like, and in order to realize the high-power laser, a scheme of multi-path laser coherent synthesis is mostly adopted at present, and in order to ensure that the output energy of the laser is most concentrated and avoid energy loss, the synchronization of the multi-path laser is very important. In the practical application process, it is very difficult to achieve absolute synchronization of multiple laser beams due to the influence of lines, electronic components, other electromagnetic interference and other factors. Therefore, there is a need for a device and a method for synchronously driving multiple lasers, which can control the driving of the lasers, and adaptively change the delay and pulse width of the driving according to specific application conditions, so as to achieve maximum energy output.
The coherent synthesis laser based on the pyramid prism utilizes the reflection characteristic of the pyramid prism, namely, after the light is totally reflected by three reflecting surfaces of the prism in sequence, the emergent light is always in reverse parallel to the incident light and is distributed in central symmetry by a cone top, no matter what angle the incident light and the bottom surface of the prism are incident. The pyramid prism is utilized to realize the phase locking of a plurality of laser media in a mutual injection phase locking mode, so that the frequency, the phase and the pulse width of multi-path laser are kept consistent as much as possible, and the coherent combination laser output with high power and high beam quality is realized. However, in practical application, the frequency, the phase and the pulse width cannot be guaranteed to be completely consistent, the traditional method is that the driving parameters of each path of laser are manually changed according to experimental results or experience, time and labor are consumed, and certain errors exist, and the self-adaptive driving method can avoid the error input of manual adjustment, is fast and stable, greatly improves the coherence of the laser, and therefore guarantees the output of high power and high beam quality.
Disclosure of Invention
The invention aims at a pyramid prism coherent synthesis laser, and provides a self-adaptive driving device based on the pyramid prism coherent synthesis laser, which can automatically adjust each path of coherent laser, solve the problem of synchronization of laser coherent synthesis output and realize high-power and high-beam-quality laser output.
In order to achieve the purpose, the invention adopts the following technical scheme:
a self-adaptive driving device based on a pyramid prism coherent synthesis laser comprises a coherent synthesis laser, a signal acquisition module, a signal processing module, a signal operation module and a signal power amplification module, wherein the coherent synthesis laser comprises a plurality of laser media and pumping sources corresponding to the laser media, each laser medium is arranged between an output mirror and the pyramid prism, laser generated by the laser media is injected into the corresponding laser medium after being reflected by the pyramid prism, the output mirror outputs coherent laser,
the signal acquisition module converts each path of coherent laser into a coherent laser electric signal and outputs the coherent laser electric signal to the signal processing module;
the signal processing module filters the coherent laser electric signal to obtain a coherent laser frequency square wave;
the signal operation module calculates the phase difference of each coherent laser through the head wave time of each coherent laser frequency square wave; compensating the pumping driving signals of the pumping sources corresponding to the coherent lasers according to the phase difference of the coherent lasers to obtain compensated pumping driving signals, and outputting the compensated pumping driving signals to a signal power amplification module;
and the signal power amplification module drives the pump source according to the compensated pump driving signal so as to reduce the phase difference of each coherent laser.
The number of the signal acquisition modules corresponds to the number of paths of coherent laser, each signal acquisition module comprises an optical filter, a first differential photodiode, a second differential photodiode and an operational amplifier, the first differential photodiode and the second differential photodiode respectively acquire the same coherent laser after natural light is filtered by the optical filter and convert the same coherent laser into a difference signal to be output to the operational amplifier, and the operational amplifier amplifies the difference signal to obtain a coherent laser electrical signal and outputs the coherent laser electrical signal to the signal processing module.
The number of the signal processing modules corresponds to the number of paths of coherent laser, each signal processing module comprises a filter and a comparator, coherent laser electric signals are input into the comparator after being filtered by the filter, and the comparator compares the filtered coherent laser electric signals with a set threshold value to obtain coherent laser frequency square waves.
The number of the signal operation modules corresponds to the number of paths of coherent lasers, each signal operation module comprises a trigger unit, a counting unit and a pumping drive signal generation unit, coherent laser frequency square waves are input into the trigger unit, the counting unit calculates the time difference of the first wave of each coherent laser frequency square wave triggering trigger unit relative to the reference time so as to obtain the phase difference of each coherent laser, the pumping drive signal generation unit compensates the pumping drive signals of the pumping sources corresponding to each coherent laser according to the phase difference of each coherent laser to obtain compensated pumping drive signals, and the compensated pumping drive signals are output to the signal power amplification module through the isolation unit.
Compared with the prior art, the invention has the following advantages and effects:
1. the two-way differential photodiode is adopted to convert optical signals into electric signals, so that the problems of low response speed, stray light interference, supersaturation and the like in the traditional photoelectric conversion are solved, and the control precision is improved.
2. Through the drive parameter that changes the laser instrument, solve the synchronous problem of the coherent synthesis of multichannel laser based on the pyramid, improve the coherent synthesis efficiency of laser instrument, avoid the error that artifical adjustment parameter brought, improved the stability and the work efficiency of laser instrument.
3. Through closed-loop feedback, the self-adaptability of the driving parameters of the multi-path laser is improved, the problem of asynchronism caused by factors such as circuits, electronic components and other electromagnetic interference is solved, and the coherent synthesis efficiency is improved.
Drawings
FIG. 1 is a schematic overall view of the present invention;
FIG. 2 is a schematic diagram of a coherent combining laser;
FIG. 3 is a schematic view of a light pipe;
FIG. 4 is a schematic diagram of a signal acquisition module;
FIG. 5 is a schematic diagram of a signal processing module;
FIG. 6 is a schematic diagram of a signal computation module;
fig. 7 is a schematic diagram of a signal power amplification module.
In the figure: 1-a coherent combining laser; 2-a signal acquisition module; 3-a signal processing module; 4-a signal operation module; 5-a signal power amplification module;
101-a laser medium; 102-a pump source; 103-an output mirror; 104-corner cube; 105-a drive electrode; 106-a fixed support; 107-a light pipe; 108-a light guide hole;
201-optical filter; 202-a first differential photodiode; 203-a second differential photodiode; 204-an operational amplifier; 205-a first bias reference voltage source; 206-a second bias reference voltage source; 207-a first current limiting resistor; 208-a second current limiting resistor;
301-a filter; 302-a comparator;
401-a trigger unit; 402-a counting unit; 403-a pump drive signal generation unit; 404-an isolation unit;
501-a current source; 502-energy storage capacitor; 503-switching tube; 504-sampling resistance.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Example 1:
a self-adaptive driving device based on a pyramid prism coherent synthesis laser comprises a coherent synthesis laser 1, a signal acquisition module 2, a signal processing module 3, a signal operation module 4 and a signal power amplification module 5, wherein the coherent synthesis laser 1 comprises a plurality of laser media 101 and pumping sources 102 corresponding to the laser media 101, each laser medium 101 is arranged between an output mirror 103 and a pyramid prism 104, laser generated by the laser media 101 is injected into the corresponding laser medium 101 after being reflected by the pyramid prism 104, the output mirror 103 outputs coherent laser,
the signal acquisition module 2 converts each path of coherent laser into a coherent laser electric signal and outputs the coherent laser electric signal to the signal processing module 3;
the signal processing module 3 filters the coherent laser electric signal to obtain a coherent laser frequency square wave;
the signal operation module 4 calculates the phase difference of each coherent laser through the head wave time of each coherent laser frequency square wave; compensating the pumping driving signal of the pumping source 102 corresponding to each coherent laser according to the phase difference of each coherent laser to obtain a compensated pumping driving signal, and outputting the compensated pumping driving signal to the signal power amplification module 5;
the signal power amplification module 5 drives the pump source 102 according to the compensated pump driving signal so that the phase difference of each coherent laser light is reduced.
The number of the signal acquisition modules 2 corresponds to the number of paths of coherent laser light, each signal acquisition module 2 comprises an optical filter 201, a first differential photodiode 202, a second differential photodiode 203 and an operational amplifier 204, the first differential photodiode 202 and the second differential photodiode 203 respectively acquire the same coherent laser light which is filtered by the optical filter 201 and natural light, convert the same coherent laser light into a difference signal and output the difference signal to the operational amplifier 204, and the operational amplifier 204 amplifies the difference signal to obtain a coherent laser electric signal and outputs the coherent laser electric signal to the signal processing module 3.
The number of the signal processing modules 3 corresponds to the number of paths of coherent laser, each signal processing module 3 comprises a filter 301 and a comparator 302, coherent laser electric signals are input into the comparator 302 after being filtered by the filter 301, and the comparator 302 compares the filtered coherent laser electric signals with a set threshold value to obtain coherent laser frequency square waves.
The number of the signal operation modules 4 corresponds to the number of paths of coherent lasers, each signal operation module 4 includes a trigger unit 401, a counting unit 402 and a pumping drive signal generation unit 403, coherent laser frequency square waves are input to the trigger unit 401, the counting unit 402 calculates a time difference between the time of triggering the trigger unit 401 by the first wave of each coherent laser frequency square wave and the reference time, so as to obtain a phase difference of each coherent laser, the pumping drive signal generation unit 403 compensates the pumping drive signal of the pumping source 102 corresponding to each coherent laser according to the phase difference of each coherent laser to obtain a compensated pumping drive signal, and the compensated pumping drive signal is output to the signal power amplification module 5 through the isolation unit 404.
Example 2:
as shown in fig. 2, an adaptive driving apparatus based on a corner cube coherent combining laser includes a coherent combining laser 1, a signal acquisition module 2, a signal processing module 3, a signal operation module 4, and a signal power amplification module 5.
The coherent combining laser 1 includes a plurality of laser mediums 101 and a pump source 102 corresponding to each laser medium 101, each laser medium 101 is disposed between an output mirror 103 and a corner cube 104, laser generated by the laser medium 101 is injected into the corresponding laser medium 101 after being reflected by the corner cube 104, and the output mirror 103 outputs coherent laser.
In this embodiment, the laser media 101 are 6-way and are arranged in parallel with each other. The 6 paths of laser media 101 are installed on a fixed support 106, the pump sources 102 can be krypton lamps, two ends of each pump source 102 are respectively provided with a driving electrode 105, the two driving electrodes 105 are applied with driving current to enable the pump sources 102 (krypton lamps) to emit light, the laser media 101 are excited to generate laser, the 6 paths of laser are injected into each other through a pyramid prism 101 and form a resonant cavity through an output mirror 103, so that 6 paths of coherent laser output are generated, the 6 paths of coherent laser respectively enter 6 light guide holes 108 of a light guide pipe 107, a light filter 201, a first differential photodiode 202 and a second differential photodiode 203 are respectively installed in each light guide hole 108, two photodiodes (202, 203) in each light guide hole 108 are closely arranged, the first differential photodiode 202 and the second differential photodiode 203 in each light guide hole 108 simultaneously collect coherent laser filtered by the light filter 201, after 6 light guide holes 108, 6 paths of coherent laser can be collected simultaneously and converted into coherent laser electric signals, and the advantage of collecting the same coherent laser by adopting the first differential photodiode 202 and the second differential photodiode 203 is that the transient interference of the photodiodes can be eliminated, and the problem of inaccurate signal collection caused by the difference of the photodiodes is avoided.
As shown in fig. 3, a first bias reference voltage source 205 is applied to the first differential photodiode 202, a second bias reference voltage source 206 is applied to the second differential photodiode 203, currents output by the first differential photodiode 202 and the second differential photodiode 203 are limited within 20mA through a first current limiting resistor 207 and a second current limiting resistor 208, when coherent laser light is emitted, 6 lines of coherent laser light respectively pass through 6 light guide holes 108, the first differential photodiode 202 and the second differential photodiode 203 installed in each light guide hole 108 simultaneously collect the lines of coherent laser light and convert the coherent laser light into a difference signal, and the difference signal passes through the operational amplifier 204 to generate a coherent laser electrical signal and transmit the coherent laser electrical signal to the signal processing module 3.
As shown in fig. 4, the number of the signal processing modules 3 corresponds to the number of paths of coherent laser beams, each signal processing module 3 includes a filter 301 and a comparator 302, the coherent laser electrical signal is filtered by the filter 301 and then input to the comparator 302, and the comparator 302 compares the filtered coherent laser electrical signal with a set threshold to obtain a coherent laser frequency square wave.
The filter 301 comprises a low-pass filter and a high-pass filter, because the working frequency of the laser is 1Hz-100Hz, the cut-off frequency of the low-pass filter is designed to be 1kHz, the cut-off frequency of the high-pass filter is 1Hz, the low-pass filter and the high-pass filter form a second-order voltage-controlled voltage source band-pass filter with the pass-band range of 1Hz-1kHz, high-frequency noise waves above the frequency of 1kHz in the signal are mainly filtered, and then the coherent laser frequency square wave suitable for being processed by the signal operation module 4 is obtained through the comparator 302.
As shown in fig. 5, the number of the signal operation modules 4 corresponds to the number of paths of the coherent laser beams, each signal operation module 4 includes a trigger unit 401, a counting unit 402, and a pumping drive signal generation unit 403, the coherent laser frequency square waves are input to the trigger unit 401, the counting unit 402 calculates a time difference between a first wave of each coherent laser frequency square wave and a trigger unit 401 triggered by the first wave of each coherent laser frequency square wave with respect to a reference time, so as to obtain a phase difference of each coherent laser beam, the pumping drive signal generation unit 403 compensates the pumping drive signal of the pumping source 102 corresponding to each coherent laser beam according to the phase difference of each coherent laser beam, so as to obtain a compensated pumping drive signal, and the compensated pumping drive signal is output to the signal power amplification module 5 through the isolation.
In this embodiment, 6 channels of coherent laser frequency square waves enter the trigger unit 401 of the signal operation module 4, and the time difference between the time of triggering the trigger unit 401 by the first wave of the following 5 channels of coherent laser frequency square waves and the reference time is sequentially calculated by using the triggering time of the first wave of the 1 channel of coherent laser frequency square waves which triggers the trigger unit 401 first as the reference time, so as to obtain the phase difference of each coherent laser. If 6 coherent laser beams are absolutely coherent, the coherent laser beams should be synchronized, but due to some factors, the coherent laser beams cannot be synchronized, which is the reason for the phase difference. The pump driving signal generating unit 403 performs PID operation on the phase difference corresponding to each coherent laser beam to obtain a compensated pump driving signal. The pump source 102 is driven by the compensated pump driving signal, so that the coherent laser light output again is self-adaptively synchronized.
As shown in fig. 6, the signal power amplifying module 5 includes a current source 501, an energy storage capacitor 502, a switching tube 503 and a sampling resistor 504.
The pumping driving signal is connected with the driving electrode of the switch tube 503, the energy of the current source 501 is stored in the energy storage capacitor 502, when the pumping driving signal is at a low level, the switch tube 503 is always closed, when the pumping driving signal is at a high level, the switch tube 503 is turned on, the two ends of the switch tube 503 are connected with the driving electrode 105 of the pumping source 102 (krypton) in series according to the sequence of the positive electrode and the negative electrode, and are grounded after passing through the sampling resistor 504 to form a complete loop, the voltage generated on the sampling resistor 504 is fed back to the current source 501, so that a closed loop is formed, and the current flowing through the pumping source 102 is kept constant.
The others correspond to example 1.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (1)
1. A self-adaptive driving device based on a pyramid prism coherent synthesis laser comprises a coherent synthesis laser (1) and is characterized by further comprising a signal acquisition module (2), a signal processing module (3), a signal operation module (4) and a signal power amplification module (5), wherein the coherent synthesis laser (1) comprises a plurality of laser media (101) and pumping sources (102) corresponding to the laser media (101), each laser medium (101) is arranged between an output mirror (103) and a pyramid prism (104), laser generated by the laser media (101) is injected into the corresponding laser medium (101) after being reflected by the pyramid prism (104), and the output mirror (103) outputs coherent laser,
the signal acquisition module (2) converts each path of coherent laser into a coherent laser electric signal and outputs the coherent laser electric signal to the signal processing module (3);
the signal processing module (3) filters the coherent laser electric signal to obtain a coherent laser frequency square wave;
the signal operation module (4) calculates the phase difference of each coherent laser through the head wave time of each coherent laser frequency square wave; according to the phase difference of each coherent laser, compensating the pumping driving signal of the pumping source (102) corresponding to each coherent laser to obtain a compensated pumping driving signal, and outputting the compensated pumping driving signal to a signal power amplification module (5);
the signal power amplification module (5) drives the pump source (102) according to the compensated pump driving signal so that the phase difference of each coherent laser is reduced,
the number of the signal operation modules (4) corresponds to the number of paths of coherent lasers, each signal operation module (4) comprises a trigger unit (401), a counting unit (402) and a pumping drive signal generating unit (403), coherent laser frequency square waves are input into the trigger unit (401), the counting unit (402) calculates the time difference of the time of triggering the trigger unit (401) by the first wave of each coherent laser frequency square wave relative to the reference time so as to obtain the phase difference of each coherent laser, the pumping drive signal generating unit (403) compensates the pumping drive signal of the pumping source (102) corresponding to each coherent laser according to the phase difference of each coherent laser to obtain a compensated pumping drive signal, and the compensated pumping drive signal is output to the signal power amplification module (5) through an isolation unit (404),
the number of the signal acquisition modules (2) corresponds to the number of paths of coherent laser, each signal acquisition module (2) comprises an optical filter (201), a first differential photodiode (202), a second differential photodiode (203) and an operational amplifier (204), the first differential photodiode (202) and the second differential photodiode (203) respectively acquire the same coherent laser after natural light is filtered by the optical filter (201) and convert the same coherent laser into a difference signal to be output to the operational amplifier (204), the operational amplifier (204) amplifies the difference signal to obtain a coherent laser electric signal and outputs the coherent laser electric signal to the signal processing module (3),
the number of the signal processing modules (3) corresponds to the number of paths of coherent laser, each signal processing module (3) comprises a filter (301) and a comparator (302), coherent laser electric signals are input into the comparator (302) after being filtered by the filter (301), and the comparator (302) compares the filtered coherent laser electric signals with a set threshold value to obtain coherent laser frequency square waves.
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| CN109188682B (en) * | 2018-08-27 | 2020-11-03 | 中山大学 | Emergent wavefront optimization method of hollow pyramid prism |
| CN110026685A (en) * | 2019-05-24 | 2019-07-19 | 长春理工大学 | A kind of multi-path laser interference lithography system and method for polarization state in the same direction |
| CN111258079B (en) * | 2020-02-18 | 2021-11-19 | 中国科学院光电技术研究所 | Precise phase adjusting mechanism of laser retroreflector array and detection and adjustment method thereof |
| CN112928582B (en) * | 2021-01-25 | 2022-11-01 | 中国人民解放军陆军工程大学 | Non-phase measurement automatic synchronization method of passive coherent combining laser |
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