CN116845681B - Pulse pumping laser for compensating jitter of external trigger signal and compensation method - Google Patents
Pulse pumping laser for compensating jitter of external trigger signal and compensation method Download PDFInfo
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- CN116845681B CN116845681B CN202311083996.2A CN202311083996A CN116845681B CN 116845681 B CN116845681 B CN 116845681B CN 202311083996 A CN202311083996 A CN 202311083996A CN 116845681 B CN116845681 B CN 116845681B
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- 238000005086 pumping Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004065 semiconductor Substances 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 8
- 238000004146 energy storage Methods 0.000 abstract description 11
- 229910052724 xenon Inorganic materials 0.000 description 8
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/1001—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the optical pumping
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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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
- H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
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Abstract
The invention discloses a pulse pump laser and a compensation method for compensating external trigger signal jitter, wherein the pulse pump laser for compensating external trigger signal jitter comprises: the laser device comprises an external time sequence module, a laser pumping module, a laser output module and a laser amplifier; the external time sequence module respectively sends a first signal and a second signal to the laser pumping module and the laser output module; the laser pumping module receives the first signal and provides pumping energy for the laser amplifier; the laser output module receives the second signal; with optimum delay between first and second signalsAnd time jitterThe method comprises the steps of carrying out a first treatment on the surface of the The signal interval time between the first signal and the second signal satisfies a functionThe method comprises the steps of carrying out a first treatment on the surface of the And adjusting the pumping time of the laser pumping module for providing pumping energy for the laser amplifier according to the signal interval time, wherein the pumping time is longer than the signal interval time. The invention ensures that the second signal is output when the energy storage of the gain medium of the first signal is maximum.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a pulse pump laser for compensating jitter of an external trigger signal and a compensation method.
Background
In order to improve the electro-optical conversion efficiency, the conventional low-repetition frequency laser mostly adopts a pulse pumping technology, and the pulse pumping technology does not continuously output pumping light but periodically pulse when the laser works. The duty ratio of the working time is lower when the same output energy is ensured, so the total electro-optical conversion efficiency is very high, the waste heat is reduced, and the power of a heat dissipation system is reduced.
Because of the energy storage characteristic of the gain medium, the energy storage in the gain medium can reach the maximum value only after the pumping system works for a certain time, and the maximum output energy can be obtained after the laser outputs laser light through the gain medium. According to the characteristic, the pulse pumped laser needs to provide two time sequence signals when in use, wherein the first signal is a trigger signal of a pumping system, and the second signal is an optical output signal. And the pumping system starts to provide pumping light after receiving the first signal, and when the gain medium absorbs the pumping light and stores energy to the maximum, the output module of the laser receives second signal output laser, and the output laser extracts the stored energy through the gain medium and outputs amplified laser pulse. In order to ensure that the laser pulse energy output finally reaches the maximum and the energy output each time is relatively stable, we have to ensure that there is a fixed delay t between the second signal and the first signal, as shown in fig. 1, i.e. the second signal is output when the energy storage of the gain medium is maximum. When two trigger signals are provided by the laser, the two signals are controllable in time sequence relation, and in order to accurately control the laser light emitting time to be matched with other devices of the system in many practical applications, the laser needs to work in an external trigger state, namely, the two time sequence signals of the laser work are given by an external system to achieve the effect of synchronizing with other devices.
However, in some specific application scenarios, two signals with fixed delays cannot be provided, so that the entire laser system cannot guarantee stable energy output. For example, in a specific high-speed moving object test, the system uses laser to illuminate the object to be tested and then shoots the moving state of the object to be tested through the camera, and as the time that the object to be tested reaches the shooting area of the camera cannot be determined, the system increases the moment that the detector detects that the object to be tested reaches the position before the shooting area in actual shooting, and transmits signals to the system controller after the detection, and the controller controls the laser and the camera to shoot. If the speed of the object is very fast, and the distance between the detector and the shooting position is not far enough, when the movement time of the measured object from the detector position to the shooting position is less than 150us, the common Nd-YAG laser cannot reach the highest energy output, meanwhile, the speed of the measured object is uncertain, the time interval from giving a trigger signal to shooting is also uncertain, and the output stability of the laser is reduced again.
In view of this, there is an urgent need to improve the existing pulse pump lasers, and the use requirement of outputting the laser pulse time can still be precisely controlled under the condition that the external system cannot provide two trigger signals with fixed delay.
Disclosure of Invention
The invention discloses a pulse pump laser for compensating jitter of an external trigger signal and a compensation method, which are used for solving the problem that in the prior art, the output laser pulse time cannot be accurately controlled under the condition that an external system cannot provide two trigger signals with fixed delay.
In order to solve the problems, the invention adopts the following technical scheme:
there is provided a pulse pump laser compensating for jitter of an external trigger signal, comprising: the laser device comprises an external time sequence module, a laser pumping module, a laser output module and a laser amplifier;
the external time sequence module can respectively send out a first signal and a second signal to the laser pumping module and the laser output module;
the laser pumping module is configured to: receiving the first signal and providing pumping energy to the laser amplifier;
the laser output module is configured to: receiving the second signal;
with optimum delay between the first and second signals；
With time jitter between the first and second signals；
The signal interval time between the first signal and the second signal satisfies a function；
And adjusting the pumping time of the laser pumping module for providing pumping energy for the laser amplifier according to the signal interval time, wherein the pumping time is larger than the signal interval time.
In the above scheme, the gain medium of the laser amplifier after receiving the first signalThe moment reaches the maximum, and the gain medium is in a supersaturated state in the later pumping time period.
In the above scheme, the pumping time is+2。
In the above scheme, the time interval between the first signal and the second signal is+。
In the above scheme, the actual signal interval time of the first signal and the second signalThe function is satisfied:
。
in the above aspect, the laser output module is configured to: and outputting laser pulses, wherein the laser pulses pass through the laser amplifier and then are amplified in energy and output.
In the above scheme, the laser pumping module comprises a pulse semiconductor pumping power supply.
In the above scheme, the laser output module comprises a pulse oscillator.
In the above scheme, the gain medium comprises Nd: YAG crystals.
The invention also provides a method for compensating the jitter of the external trigger signal, which comprises the following steps:
the external time sequence module respectively sends a first signal and a second signal to the laser pumping module and the laser output module;
the laser pumping module receives the first signal and provides pumping energy for the laser amplifier;
the laser output module receives the second signal;
obtaining an optimal delay between the first signal and the second signal；
Acquiring time jitter between the first signal and the second signal；
Calculating a signal interval time satisfaction function between the first signal and the second signal；
And adjusting the pumping time of the laser pumping module for providing pumping energy for the laser amplifier according to the signal interval time, wherein the pumping time is larger than the signal interval time.
The technical scheme adopted by the invention can achieve the following beneficial effects:
extending pumping time of laserTo the point of+2Ensure the gain medium in2 after the momentMaintaining the maximum energy storage position in time and setting the signal interval between the first signal and the second signal to beThe method avoids the influence of signal jitter between the first signal and the second signal on the actual interval time between the first signal and the second signal, and ensures that the second signal is output when the energy storage of the gain medium of the first signal is maximum.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments are briefly described below to form a part of the present invention, and the exemplary embodiments of the present invention and the description thereof illustrate the present invention and do not constitute undue limitations of the present invention. In the drawings:
FIG. 1 is a waveform diagram of the external trigger timing relationship of a pulse pump laser for a first signal and a second signal in the prior art;
FIG. 2 is a waveform diagram of the external trigger timing relationship of the external trigger signal jitter compensating pulse pump laser of the first signal and the second signal of the external trigger signal jitter compensating pulse pump laser disclosed in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a pulse pump laser for compensating jitter of an external trigger signal according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram showing the structure of a lamp pumped Nd: YAG oscillator system as disclosed in embodiment 4 of the present invention.
The method specifically comprises the following reference numerals:
an external timing module-10; a laser pumping module-20; a laser output module-30; a laser amplifier-40; an external timing generator-51; pulse xenon lamp pumping power supply-52; a rear cavity mirror-53; q-switch-54; a polarizer-55; pulse xenon lamp-56; nd is YAG crystal-57; and an output mirror-58.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 2 and 3, the pulse pump laser for compensating jitter of an external trigger signal provided by the present invention includes: an external timing module 10, a laser pumping module 20, a laser output module 30, and a laser amplifier 40; the external timing module 10 is capable of sending a first signal and a second signal to the laser pumping module 20 and the laser output module 30, respectively; the laser pumping module 20 is arranged to: receiving a first signal and providing pumping energy to a laser amplifier; the laser output module 30 is configured to: receiving a second signal; with optimum delay between first and second signalsThe method comprises the steps of carrying out a first treatment on the surface of the With time jitter between the first signal and the second signalThe method comprises the steps of carrying out a first treatment on the surface of the The signal interval time between the first signal and the second signal satisfies a functionThe method comprises the steps of carrying out a first treatment on the surface of the The pump time for laser pump module 20 to provide pump energy to laser amplifier 40 is adjusted based on the signal interval time, the pump time being greater than the signal interval time.
It is preferred that the present embodiment is provided,the gain medium of the laser amplifier 40 after receiving the first signalThe moment reaches the maximum and the gain medium is in a supersaturated state in the following pumping period. The energy storage of the gain medium is always at the maximum position, so that the output energy of the laser pulse is ensured to be the highest, and the energy stability is in a normal state.
The preferred pump time of this embodiment is+2. The time interval between the first signal and the second signal is+Due to time jitter between the first signal and the second signalI.e. the time interval between the actual first signal and the second signal is relatively theoreticalIs a function of the error of (a).
Thus, the actual signal interval time of the first signal and the second signalThe function is satisfied:
。
ensuring that the laser pump module 20 operates at least t when the output module 30 of the laser receives the second signal 1 Thereby ensuring that the energy storage of the gain medium is at a maximum state to ensure that the output energy of the laser pulse is at a maximum and the energy is stableThe sex is still in a normal state.
In this embodiment, the laser output module 30 is preferably configured to: the laser pulse is output, and the laser pulse is energy-amplified and output after passing through the laser amplifier 40.
Example 2
The invention also provides a method for compensating the jitter of the external trigger signal, which comprises the following steps:
the external time sequence module respectively sends a first signal and a second signal to the laser pumping module and the laser output module;
the laser pumping module receives the first signal and provides pumping energy for the laser amplifier;
the laser output module receives the second signal;
obtaining an optimal delay between a first signal and a second signal；
Acquiring time jitter between a first signal and a second signal；
Calculating a signal interval time satisfaction function between the first signal and the second signal；
And adjusting the pumping time of the laser pumping module for providing pumping energy for the laser amplifier according to the signal interval time, wherein the pumping time is longer than the signal interval time.
Example 3
The present embodiment will be described by taking a semiconductor pumped nd:yag amplifier system as an example:
in the embodiment, the external time sequence module is an external time sequence generator, the laser pumping module is a pulse semiconductor pumping power supply, the laser output module is a pulse oscillator, and the laser amplifier is a semiconductor pumping Nd: YAG amplifier.
Specifically, the external time sequence generator is Nd, and the YAG amplifier system provides synchronous time sequence trigger signals which are a first signal and a second signal respectively; a pulse semiconductor pumping power supply for receiving the first signal and providing pumping energy for a pulse semiconductor module of the Nd-YAG amplifier; the pulse oscillator receives the second signal and outputs pulse laser; and after the pulse laser emitted by the pulse oscillator passes through the semiconductor pumping Nd-YAG amplifier, the energy stored in the Nd-YAG crystal is extracted, so that the pulse laser with larger energy is obtained.
In the embodiment, the service life of the upper energy state of the Nd-YAG crystal is 240us, and under normal conditions, the semiconductor pumping Nd-YAG amplifier can store energy to the maximum after receiving pumping energy of 250us, at the moment, the pulse oscillator emits laser pulses, and the maximum amplification efficiency is obtained after the semiconductor pumping Nd-YAG amplifier. When the longest pulse jitter time which can occur in the external time sequence generator is t, the semiconductor pumping power supply provides a pumping output with the duration of 250us+2t after receiving the first signal sent by the external time sequence generator, so that the semiconductor pumping Nd-YAG amplifier is guaranteed to have the maximum energy storage state in the time of 250us to 250us+2t after sending the first signal by the external time sequence generator. Meanwhile, the external time sequence generator gives out a second signal to the component pulse oscillator to output laser pulse at any time between 250us and 250us+2t after the first signal is sent out, so that the whole set of Nd: YAG amplifier can obtain the maximum laser amplification energy.
Example 4
As shown in fig. 4, a lamp pumped nd:yag oscillator system is taken as an example for explanation:
the embodiment comprises the following steps: an external timing generator 51 for providing a synchronous timing trigger signal for the Nd: YAG oscillator system; pulse xenon lamp pumping power supply 52 with pumping discharge pulse width ofThe pump energy is provided for a pumping source xenon lamp of the Nd-YAG oscillator; a rear cavity mirror 53; a Q-switch 54; a polarizer 55; a pulse xenon lamp 56 for supplying pump light to the Nd: YAG crystal 57; YAG crystal 57 for absorbing pump light of pulse xenon lamp 56 and accumulating upper energy state inversion particles; and an output mirror 58. The external timing generator 51 is inA trigger signal is sent out at a moment to the pulse xenon lamp pump power supply 52, and the pulse xenon lamp 56 works to provide pump energy for the Nd: YAG crystal 57. When passing through 250us toAfter any time, the external timing generator 51 provides a Q-switching trigger signal for the Q-switch 54, the Q-switch 54 starts to switch Q, at this time, after the pumping time of over 250us is passed through by the Nd: YAG crystal 57, the number of upper energy state particles is always in the maximum state, and the accumulated upper energy state particles start to oscillate through the resonant cavity formed by the rear cavity mirror 53 and the output mirror 58, so as to finally form stable laser pulse output.
The invention extends the pumping time of the laser to+2Ensure the gain medium in2 after the momentMaintaining the maximum energy storage position in time and setting the signal interval between the first signal and the second signal to beThe method avoids the influence of signal jitter between the first signal and the second signal on the actual interval time between the first signal and the second signal, and ensures that the second signal is output when the energy storage of the gain medium of the first signal is maximum.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (6)
1. A pulse pump laser for compensating for jitter in an external trigger signal, comprising: the laser device comprises an external time sequence module, a laser pumping module, a laser output module and a laser amplifier;
the external time sequence module can respectively send out a first signal and a second signal to the laser pumping module and the laser output module;
the laser pumping module is configured to: receiving the first signal and providing pumping energy to the laser amplifier;
the laser output module is configured to: receiving the second signal;
with optimum delay between the first and second signals；
With time jitter between the first and second signals；
The signal interval time between the first signal and the second signal satisfies a function；
Adjusting pumping time of pumping energy provided by the laser pumping module to the laser amplifier according to the signal interval time, wherein the pumping time is larger than the signal interval time;
the gain medium of the laser amplifier receives the first signalAfter numberingThe moment reaches the maximum, and the gain medium is in a supersaturated state in the subsequent pumping time period;
the pumping time is；
The time interval of the first signal and the second signal is that；
The actual signal interval time of the first signal and the second signalThe function is satisfied:
。
2. the pulse pump laser for compensating for jitter of an external trigger signal according to claim 1, wherein the laser output module is configured to, upon receiving the second signal: and outputting laser pulses, wherein the laser pulses pass through the laser amplifier and then are amplified in energy and output.
3. The pulse pump laser for compensating for jitter of an external trigger signal of claim 1 wherein the laser pumping module comprises a pulsed semiconductor pump power supply.
4. The pulse pump laser for compensating for jitter of an external trigger signal of claim 1 wherein the laser output module comprises a pulse oscillator.
5. The pulse pump laser for compensating for jitter of an external trigger signal of claim 1 wherein the gain medium comprises Nd: YAG crystals.
6. A method of compensating for jitter in an external trigger signal for a pulse pump laser, comprising:
the external time sequence module respectively sends a first signal and a second signal to the laser pumping module and the laser output module;
the laser pumping module receives the first signal and provides pumping energy for the laser amplifier;
the laser output module receives the second signal;
obtaining an optimal delay between the first signal and the second signal；
Acquiring time jitter between the first signal and the second signal；
Calculating a signal interval time satisfaction function between the first signal and the second signal；
Adjusting pumping time of pumping energy provided by the laser pumping module to the laser amplifier according to the signal interval time, wherein the pumping time is larger than the signal interval time;
the gain medium of the laser amplifier receives the first signalThe moment reaches the maximum, and the gain medium is in a supersaturated state in the subsequent pumping time period;
the pumping time is；
The time interval of the first signal and the second signal is that；
The actual signal interval time of the first signal and the second signalThe function is satisfied:
。
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| CN110770983A (en) * | 2017-06-20 | 2020-02-07 | 通快激光有限责任公司 | Method and laser system for generating amplified pulse-on-demand output laser pulses |
| CN110943363A (en) * | 2019-12-10 | 2020-03-31 | 长春新产业光电技术有限公司 | Pulse pumping passive Q-switched laser with optical delay controllable function |
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| TW528636B (en) * | 2001-05-09 | 2003-04-21 | Electro Scient Ind Inc | Micromachining with high-energy, intra-cavity Q-switched CO2 laser pulses |
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| WO2013185792A1 (en) * | 2012-06-12 | 2013-12-19 | Photon Energy Gmbh | Short pulse laser with amplifier and adjustable pulse sequence |
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|---|---|---|---|---|
| DD248001A1 (en) * | 1983-12-30 | 1987-07-22 | Zentralinstitut Fuer Optik Und | JITTER-FREE SYNCHRONOUS PUMPED LASER |
| WO2013088139A1 (en) * | 2011-12-12 | 2013-06-20 | Thales Holdings Uk Plc | Method and apparatus for use in passive q-switching |
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