CN111355116A - System and method for laser energy control - Google Patents
System and method for laser energy control Download PDFInfo
- Publication number
- CN111355116A CN111355116A CN202010192749.6A CN202010192749A CN111355116A CN 111355116 A CN111355116 A CN 111355116A CN 202010192749 A CN202010192749 A CN 202010192749A CN 111355116 A CN111355116 A CN 111355116A
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- energy
- light beam
- laser
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- amplifier
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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
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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
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a system and a method for controlling laser energy, which comprises the following steps: the laser system comprises a first control module, a reflector, an energy meter, an amplifier and a second control module which are sequentially arranged along a laser light path; the first control module is used for adjusting the laser energy for the first time to obtain a first light beam; the reflector is used for splitting the first light beam to obtain a first reflected light beam and a second reflected light beam; the energy meter is used for receiving the first reflected light beam and recording the energy of the first reflected light beam to obtain first power; the amplifier is used for increasing the energy of the second reflected light beam to obtain a first amplified light beam; the second control module is used for adjusting the first amplified light beam for the second time according to the first power to obtain the laser beam with target energy.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a system and a method for controlling laser energy.
Background
At present, the mode frequently adopted in the injection energy control of the solid laser device is realized by adjusting the angle of an 1/2 wave plate to match with a polaroid. In experiments, it is found that when the pre-discharge output energy is small, the monitoring micro-energy meter cannot respond, the pre-discharge energy adjusting wave plate can only be adjusted through experience, the pre-emission frequency required by adjusting to a target energy point is obviously increased compared with the emission frequency of large-energy output, and the control is relatively difficult. It was also found in experiments that the output near field appeared to be strikingly striped even if the energy was adjusted in place.
Accordingly, further developments and improvements are still needed in the art.
Disclosure of Invention
In view of the above-mentioned problems, a system and method for controlling laser energy are proposed, which can ensure the accuracy of output energy and maintain the beam quality in a good near field.
In order to achieve the purpose, the invention provides the following technical scheme:
a system for laser energy control, comprising:
the laser system comprises a first control module, a reflector, an energy meter, an amplifier and a second control module which are sequentially arranged along a laser light path;
the first control module is used for adjusting the laser energy for the first time to obtain a first light beam;
the reflector is used for splitting the first light beam to obtain a first reflected light beam and a second reflected light beam;
the energy meter is used for receiving the first reflected light beam and recording the energy of the first reflected light beam to obtain first power;
the amplifier is used for increasing the energy of the second reflected light beam to obtain a first amplified light beam;
and the second control module is used for carrying out second adjustment on the first amplified light beam according to the first power to obtain a laser beam with target energy.
Preferably, the first control module and the second control module each include: the wave plate and the polaroid are arranged in sequence.
Preferably, the amplifier is a neodymium glass amplifier, including: the device comprises neodymium glass and a pumping light source, wherein the pumping light source is a xenon lamp for pumping, a first amplifier and a second amplifier.
Preferably, the laser energy control system further comprises: and the absorber is used for absorbing the stray light generated by the first control module and/or the second control module.
Preferably, the laser energy control system further comprises: and the CCD is used for acquiring the laser near field image.
Preferably, a method for laser energy control comprises:
carrying out first energy adjustment on the laser beam to obtain a first beam;
and sampling the first light beam to obtain the energy of the first light beam, wherein the energy of the laser light beam is 5% -100%. (ii) a
Amplifying the first light beam to obtain a first amplified light beam and energy thereof;
and performing secondary energy adjustment on the first amplified light beam according to the energy of the first light beam to obtain a laser beam with target energy.
Preferably, the energy of the beam after the second energy adjustment is 5% to 100% of the energy of the first amplified beam.
Has the advantages that:
the invention has simple structure, easy realization, expanded energy control range, improved energy control precision, capability of carrying out micro-energy monitoring, wide application in the aspect of controlling the injection energy of a large-scale high-power solid laser device and suitability for popularization.
Drawings
FIG. 1 is a diagram of the optical path of a system for laser energy control in an embodiment of the present invention;
FIG. 2 is a graph of the effect of the approach output of the system for laser energy control in an embodiment of the present invention.
In the drawings: 1 a first wave plate, 2 a first polaroid, 3 a first reflector, 4 micro-energy calorimeters, 5 a second reflector, 6 a first amplifier, 7 a second amplifier, 8 a second wave plate, 9 a second polaroid, 10 a third reflector, 11 a near-field monitoring CCD, 12 a first absorber and 13 a second absorber.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
The following are specific embodiments of the present invention:
fig. 1 shows that the present invention provides a system for laser energy control, which sequentially comprises a first control module, a first reflector 3, a micro-energy meter 4, a second reflector 5, a first amplifier 6, a second amplifier 7, a second control module, a third reflector 10, and a near-field monitoring CCD 11 according to an optical path.
Specifically, the first control module includes a first wave plate 1 and a first polarizer 2.
Specifically, the first reflector 3 is a 90% laser reflection mirror and a 10% laser transmission reflector.
Specifically, the detection range of the micro energy calorimeter 4 is more than 0.45 uJ.
Specifically, the second reflecting mirror 5 is a total reflection reflecting mirror.
Specifically, the first amplifier 6 is
The neodymium glass xenon lamp amplifier of (1).
In particular, the second amplifier 7 is
The neodymium glass xenon lamp amplifier of (1).
Specifically, the second control module includes a second wave plate 8 and a second polarizer 9.
Specifically, the third reflector 10 is a 90% laser reflection and 10% laser transmission reflector.
Specifically, the near-field monitoring CCD 11 is a scientific CCD.
Specifically, the laser energy control system of this embodiment further includes a first absorber 12 made of absorbing glass for absorbing 1053 laser ZWB, and a second absorber 13 made of the same material as the first absorber and used for absorbing stray light generated by the second control module.
The specific control method of the embodiment is as follows:
the laser beam carries out first energy control through a first control module, and first beam energy is obtained by sampling and is 5-100% of the original laser beam energy;
through the first reflector 3, 10% of laser energy is input into the energy calorimeter and is recorded as W, the rest 90% of energy sequentially passes through the central positions of the first amplifier 6 and the second amplifier 7 through the reflection of the first reflector 3 and the second reflector 5, the two amplifiers can realize the combination of multiple amplification factors, the required amplification factor is optimized, the optimal amplification effect is achieved, and the amplification gain factor is recorded as P;
after the laser passes through the two amplifiers, the output energy of the system is increased to joule magnitude, and the laser energy is 9 × W × P at the moment;
the amplified energy beam is subjected to secondary energy control through a second control module, the control range of the energy beam is not more than 5% -100%, finally, the energy beam is reflected by a third reflector 10 and outputs required laser energy, meanwhile, a laser output near field image is formed on a near field detection CCD 11 for detection after being transmitted by the third reflector 10, the laser output near field image is shown as figure 2 in a normal state, and oblique stripes are arranged on the laser output near field image in an abnormal state, so that the purpose of real-time monitoring is achieved.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (10)
1. A system for laser energy control, comprising:
the laser system comprises a first control module, a reflector, an energy meter, an amplifier and a second control module which are sequentially arranged along a laser light path;
the first control module is used for adjusting the laser energy for the first time to obtain a first light beam;
the reflector is used for splitting the first light beam to obtain a first reflected light beam and a second reflected light beam;
the energy meter is used for receiving the first reflected light beam and recording the energy of the first reflected light beam to obtain first power;
the amplifier is used for increasing the energy of the second reflected light beam to obtain a first amplified light beam;
and the second control module is used for carrying out second adjustment on the first amplified light beam according to the first power to obtain a laser beam with target energy.
2. The system of claim 1, wherein the first control module and the second control module each comprise: the wave plate and the polaroid are arranged in sequence.
3. The system of claim 1, wherein the amplifier is a neodymium glass amplifier comprising: neodymium glass and a pump light source.
4. The system of claim 3, wherein the pump light source is a xenon pump lamp.
5. A system according to claim 1 or 3, wherein the amplifier comprises: a first amplifier and a second amplifier.
6. The system of claim 1, further comprising: and the absorber is used for absorbing the stray light generated by the first control module and/or the second control module.
7. The system of claim 1, further comprising: and the CCD is used for acquiring the laser near field image.
8. A method for laser energy control, comprising:
carrying out first energy adjustment on the laser beam to obtain a first beam;
sampling the first light beam to obtain the energy of the first light beam;
amplifying the first light beam to obtain a first amplified light beam and energy thereof;
and performing secondary energy adjustment on the first amplified light beam according to the energy of the first light beam to obtain a laser beam with target energy.
9. The method of claim 8, wherein the energy of the first beam is between 5% and 100% of the energy of the laser beam.
10. The method of claim 8, wherein the energy of the second energy adjusted beam is between 5% and 100% of the energy of the first amplified beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010192749.6A CN111355116A (en) | 2020-03-18 | 2020-03-18 | System and method for laser energy control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010192749.6A CN111355116A (en) | 2020-03-18 | 2020-03-18 | System and method for laser energy control |
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| CN111355116A true CN111355116A (en) | 2020-06-30 |
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