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A near-field filter and laser transverse mode control system and control method based on nonlinear frequency conversion

A frequency conversion and control system technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of large volume and high environmental requirements, reduce volume and stray light, increase aperture and output energy, and suppress high The effect of order transverse mode

Active Publication Date: 2022-03-22
中国工程物理研究院上海激光等离子体研究所
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Problems solved by technology

[0004] In view of the shortcomings of large volume and high environmental requirements in the widely used spatial filter in the existing laser oscillator and amplifier technology, the present invention provides a near-field filter and laser transverse mode control method based on nonlinear frequency conversion

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  • A near-field filter and laser transverse mode control system and control method based on nonlinear frequency conversion
  • A near-field filter and laser transverse mode control system and control method based on nonlinear frequency conversion
  • A near-field filter and laser transverse mode control system and control method based on nonlinear frequency conversion

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Embodiment 1

[0060] The structural device composition and optical path composition of the control system in this embodiment are mainly reflected in figure 1 In the system structure, for example, the composition of structural devices includes laser end mirror 1, polarizer 2, gain medium and pump source 3, folding mirror 4, nonlinear frequency doubling crystal 5, dichroic mirror 6, precision translation stage 7 , the dichroic mirror 6 is fixed on the precision translation stage 7 . In addition to the above-mentioned structural device composition, the numbers 8, 9, 10, 11 and 12 shown in the figure all indicate the transmission direction of the laser beam, and the numbers 8 and 9 are the linearly polarized light of the intracavity oscillation fundamental frequency, and the polarization direction is determined by the polarizer 2 decision; No. 10 is the remaining fundamental frequency light after passing through the frequency doubling crystal; No. 11 is the frequency doubling light, and No. 12 ...

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Abstract

The invention discloses a near-field filter and laser transverse mode control system based on nonlinear frequency conversion, which includes a laser end mirror, a polarizer, a gain medium and a pump source, a nonlinear frequency doubling crystal, a dichroic mirror and a precision translation A near-field filter and laser transverse mode control system is composed of a laser, a nonlinear frequency conversion crystal and a dichroic mirror. The present invention also constructs a new near-field filter method based on nonlinear effects, which can control the number of transverse modes of the laser. In the system and method of the present invention, in the nonlinear frequency conversion process, the high-order transverse mode conversion efficiency is low, and the laser cavity will be leaked from the dichroic mirror, and the low-order mode will be converted back to the fundamental frequency during the reverse transmission process, thereby Trapped in the laser cavity to oscillate, and finally achieve laser transverse mode control.

Description

technical field [0001] The invention belongs to the technical field of laser oscillation and amplification, and more specifically relates to a beam near-field filtering and transverse mode control method based on reversible nonlinear frequency conversion technology, which can compress the spatial divergence angle of the laser output beam within ±200μrad. Background technique [0002] In high-power laser oscillators or amplifiers, the spatial filter is one of the key devices, which is mainly used to suppress high-order transverse modes or high-frequency disturbances in the beam. This method is mainly based on the principle of Fourier transform optics, that is, a small hole is inserted in the confocal plane of a pair of confocal lenses, so that the high-order transverse mode of the beam is blocked. This method is simple and efficient, and has been adopted by most high-power laser systems. However, as the beam aperture and energy increase, the volume of the spatial filter will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/109H01S3/102
CPCH01S3/109H01S3/1022
Inventor 季来林刘栋刘佳妮隋展崔勇饶大辛郑权李小莉夏兰赵晓辉高妍琦
Owner 中国工程物理研究院上海激光等离子体研究所
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