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Method of Improving Spatial Filter's Transmittance of Small Broadband Spectral Dispersion Smooth Beam

A spatial filter and spectral color technology, applied in the direction of instruments, optics, optical components, etc., can solve the problems of large energy loss, achieve good stability, improve energy transmittance, good adaptability and stability

Active Publication Date: 2019-01-22
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, if the original circular small hole is still used, in the sweeping direction of the focal spot, the small hole will filter out too many light field components, and the energy loss will be large.

Method used

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  • Method of Improving Spatial Filter's Transmittance of Small Broadband Spectral Dispersion Smooth Beam
  • Method of Improving Spatial Filter's Transmittance of Small Broadband Spectral Dispersion Smooth Beam
  • Method of Improving Spatial Filter's Transmittance of Small Broadband Spectral Dispersion Smooth Beam

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Embodiment

[0045] In this embodiment, the wavelength of the main laser is 1053 nm, the beam diameter is 22 mm, and the focal length f of the focusing lens is 0.8 m.

[0046]For reference, when a circular aperture is used, the size 2a=13.3DL (diffraction limit, Diffraction Limit, DL), the focal spot and the circular filter aperture (white circle in the figure) without adding spectral dispersion smoothing are as follows figure 2 shown.

[0047] And when adding spectral dispersion evenly (beam bandwidth is 1nm, the dispersion coefficient of grating is 9.0877e5, Δx=11DL), when using elliptical aperture, minor axis length is 2a=13.3DL, major axis length is 2a+Δx= 24.3DL. image 3 It is the distribution of the focal spot when the spectral dispersion is uniformly added, and the schematic diagram of the circular filter hole and the ellipse filter hole (the white circle in the figure).

[0048] calculate image 3 The energy transmittance of the filter holes in the filter is 95.1% when the cir...

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Abstract

The present invention discloses a method for improving small broadband spectrum dispersion smoothing beam transmittance through a spatial filter. The method comprises: a first lens performs Fourier transform of a small broadband spectrum dispersion smoothing beam; a filtering pinhole located on the focal plane of the first lens performs spatial filtering of focused focal spots to filter high-frequency portions in the light beam; and a second lens located behind the filtering pinhole performs Fourier transform of the filtered focal spots to obtain a filtered light beam, wherein the filtering pinhole is configured to be an elliptical structure matching the sweeping direction of the focal spots. The method for improving small broadband spectrum dispersion smoothing beam transmittance through the spatial filter can configure the filtering pinhole to be the elliptical structure matching the sweeping direction of the focal spots to improve the small broadband spectrum dispersion smoothing beam filtering transmittance so as to improve the filtering transmittance about at least 3% on the basis of an original round small hole and allow the small broadband spectrum dispersion smoothing beam to have better adaptation and stability.

Description

technical field [0001] The present invention relates to a method for increasing filter transmittance used in the case of inertial confinement fusion research. More specifically, the present invention relates to a method for improving the filter transmittance when the smooth light beam with small broadband spectral dispersion passes through the spatial filter in the research of inertial confinement fusion. Background technique [0002] In the research of inertial confinement fusion, in order to achieve uniform irradiation on the target surface, the high-power solid-state laser device adopts the small broadband spectral dispersion smoothing technology, and the phase-modulated beam with a certain bandwidth is spectrally dispersed through the dispersion grating to realize the focal spot. Dynamic swipe. [0003] In high-power solid-state laser devices, in order to achieve image transfer and improve beam quality, spatial filters are used in the optical path. The spatial filter c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09
CPCG02B27/0927G02B27/0988
Inventor 黄晚晴张颖刘兰琴耿远超王文义孙喜博郑天然
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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