Chirped pulse amplification laser device with targeting returned light detecting function and detection method of chirped pulse amplification laser device

A laser device and chirped pulse technology are applied in the field of chirped pulse amplifying laser devices, which can solve the problems of difficulty in detecting return light, separation of incident light and return light, etc., so as to increase the detection ability and protect the effect of damage.

Active Publication Date: 2015-08-19
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, since the return light generated during laser shooting returns along the original path of the optical path, it is difficult to separate the incident light and the return light on the optical path, so it is difficult to detect the return light

Method used

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  • Chirped pulse amplification laser device with targeting returned light detecting function and detection method of chirped pulse amplification laser device
  • Chirped pulse amplification laser device with targeting returned light detecting function and detection method of chirped pulse amplification laser device
  • Chirped pulse amplification laser device with targeting returned light detecting function and detection method of chirped pulse amplification laser device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 2 As shown, in this embodiment, the compressor adopts a single grating G, and cooperates with a horizontal right-angle mirror PM, a right-angle mirror CM and a mirror M to realize that the beam passes through the grating four times; the high-energy laser beam output from the amplifier enters To the compressor, it first enters the upper half area of ​​the grating G, the incident angle of the beam is β, the grating G diffracts the incident laser light, and the first-order diffracted light with a diffraction angle of α enters the horizontal right-angle mirror PM, and the beam passes through the horizontal right-angle mirror After the PM is reflected, it emerges in the same horizontal plane along the opposite direction of incident on the horizontal right-angle reflector, and the outgoing light is translated in the horizontal direction relative to the incident light on the horizontal right-angle reflector, and the outgoing light is incident on the upper half o...

Embodiment 2

[0044] Such as Figure 4 As shown, in this embodiment, the compressor adopts double gratings, that is, the first grating G1 and the second grating G2 with the same parameters, and cooperates with a right-angle mirror CM and a mirror M to realize that the light beam passes through the grating four times; from The high-energy laser beam amplified by the amplifier is input into the compressor, and firstly enters the upper half area of ​​the first grating G1, the beam incident angle is β, the first grating diffracts the incident laser light, and the first-order diffracted light with the diffraction angle α is reflected to In the upper half area of ​​the second grating, the first grating is parallel to the second grating. At this time, the incident angle of the light beam incident on the second grating G2 is α, and the first-order diffracted light with a diffraction angle of β is incident on the right-angle mirror. After being reflected by the right-angle mirror CM, it will exit pa...

Embodiment 3

[0069] In this example, if Figure 10 As shown, the compressor uses four first to fourth gratings G1 to G4 with the same parameters to realize the beam passing through the gratings four times; the high-energy laser beam amplified by the amplifier enters the compressor, and first enters the first grating G1, The beam incident angle is β, and the first-order diffracted light with a diffraction angle of α enters the second grating G2, the first grating and the second grating are parallel, and the first-order diffracted light of the second grating enters the third grating G3, and the incident angle is β, The first-order diffracted light with a diffraction angle of α enters the fourth grating G4, the third grating is parallel to the fourth grating, and the first-order diffracted light of the fourth grating is output as the main optical path of the compressor. All the above rays are in the same horizontal plane. The return light passes through the fourth to the first grating in tur...

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Abstract

The invention discloses a chirped pulse amplification laser device with a targeting returned light detecting function and a detection method of the chirped pulse amplification laser device. According to the chirped pulse amplification laser device and the detection method of the invention, returned light passes through an optical grating by four times, and is diffracted by four times; the incident angle of returned light which is returned to the optical grating from a targeting place is equal to the angle beta of first-level diffraction light of a light beam amplified by an amplifier, wherein the first-level diffraction light is emitted onto the optical grating in a compressor, and the angle of 0-stage diffraction light is equal to the incident angle, and the 0-stage diffraction angle is different from the first-level diffraction angle; a detector is arranged at the direction of 0-stage diffraction light which is generated at one place in the optical grating where the returned light passes by four times; 0-stage diffraction light on the optical grating of the returned light, is detected; the detector receives all 0-stage diffraction light of the returned light; the 0-stage diffraction light in the compressor is not located in a main light path, and is an idle light beam; the idle light beam is applied to detection, so that the use and transmission of a laser beam will not be affected; and a returned light detecting ability is improved, and damage to a laser system caused by returned light in interaction of laser and plasmas can be greatly prevented.

Description

technical field [0001] The invention relates to high-energy particle acceleration technology, in particular to a chirped pulse amplifying laser device for detecting target return light and a detection method thereof. Background technique [0002] Since chirped laser pulse amplification (CPA) was proposed, the peak power of lasers has developed rapidly, and the peak power of laser pulses can reach several PW (10 15 W), the laser light intensity can reach 10 22 W / cm 2 . Such high-field lasers are widely used in laser-plasma interactions. When the laser interacts with the plasma, the laser is absorbed and reflected by the plasma, and the reflected light may return to the laser in the same way, resulting in damage to the laser components. This is also a very important safety issue faced in the application of high-field lasers. [0003] Common CPA techniques such as figure 1 As shown, an oscillator generates an ultrashort pulse (the pulse width is usually on the order of pic...

Claims

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Application Information

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IPC IPC(8): H01S3/10G02F1/39G01J1/00
Inventor 赵研英颜学庆卢海洋林晨耿易星李荣凤廖庆
Owner PEKING UNIV
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