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Non-collineation serial beam grouping method and device based on excited brillouin scattering

A stimulated Brillouin, non-collinear technology, applied in the field of optics, can solve the problem of not being able to further realize beam grouping, and achieve the effect of low energy stability requirements, simple structure, and improved volume of action

Active Publication Date: 2015-06-03
吕志伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when several beams of light are combined in series, the energy density of the amplified light reaches the generation threshold of nonlinear effects such as stimulated Raman scattering of the medium or exceeds the breakdown threshold of the medium, so that further beam combination cannot be realized Problem, provide a non-collinear serial beam combining method and device based on stimulated Brillouin scattering

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  • Non-collineation serial beam grouping method and device based on excited brillouin scattering
  • Non-collineation serial beam grouping method and device based on excited brillouin scattering
  • Non-collineation serial beam grouping method and device based on excited brillouin scattering

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specific Embodiment approach 1

[0016] Specific implementation mode 1: Combination figure 1 To illustrate this embodiment, the non-collinear serial beam combining method based on stimulated Brillouin scattering described in this embodiment is: a cylindrical surface is provided at the seed light incident end of each non-collinear Brillouin amplification structure unit 1 Lens expansion system 1-1, the seed light 2 is expanded by the cylindrical lens beam expansion system 1-1, and then enters the non-collinear Brillouin amplification structure unit 1, multiple non-collinear Brillouin amplification structure units 1Serial connection.

[0017] In the above method, before the seed light 2 enters each dielectric cell 1-2, it is expanded by the cylindrical lens beam expanding system 1-1. This method can improve the load capacity of the beam assembly device and avoid stimulated Raman scattering. Non-linear effects and dielectric breakdown threshold problems.

specific Embodiment approach 2

[0018] Specific implementation manner two: combination figure 1 This embodiment is described. This embodiment is a further limitation to the non-collinear serial beam combining method based on stimulated Brillouin scattering described in the first embodiment. In this embodiment, the non-collinear Brillouin A cylindrical lens beam reduction system 4 is provided at the seed light output end of the louver magnification structure unit 1, and the seed light 2 is amplified by the last-stage non-collinear Brillouin magnification structure unit 1, and then exits through the cylindrical lens beam reduction system 4.

[0019] The cylindrical lens beam reduction system 4 is used to shape the seed light 2 into the shape before magnification. After several levels of beam combination, the beam spot shape of the output amplified light can still be kept the same as before the incident.

specific Embodiment approach 3

[0020] Specific implementation mode three: combination figure 1 To illustrate this embodiment, the non-collinear serial beam combining device based on stimulated Brillouin scattering in this embodiment includes n non-collinear Brillouin amplification structural units 1, where n is a natural number, and n> 1. The n non-collinear Brillouin magnifying structure units 1 are connected in series, and each non-collinear Brillouin magnifying structure unit 1 includes a cylindrical lens beam expanding system 1-1, a dielectric cell 1-2 and an optical trap 1 -3. After the seed light 2 is expanded by the cylindrical lens beam expanding system 1-1, it is incident into the medium cell 1-2 along the length of the medium cell 1-2, and the pump light 3 is from one of the medium cell 1-2 The side is incident into the medium cell 1-2 and the seed light 2 is amplified. The remaining pump light 3 passes through the medium cell 1-2 and then enters the optical trap 1-3. The seed light 2 and the pump li...

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Abstract

The invention discloses a non-collineation serial beam grouping method and device based on excited brillouin scattering, relates to a serial beam grouping technique of laser, and aims to solve the problem that in serial beam grouping, a plurality of light beams cannot be further grouped when amplification light energy density reaches a generation threshold of a nonlinear effect such as excited brillouin scattering of a medium or exceeds a breakdown threshold of the medium. Seed light is fed to be in front of each medium pond, beams are firstly amplified through a cylindrical lens beam amplification system, and the outgoing end of a final medium pond is provided with a cylindrical lens beam shrinkage system for shrinking the beams, so that the problems that nonlinear effects such as excited brillouin scattering are generated and the medium has a breakdown threshold can be avoided; in addition, the structure is simple, the amplification efficiency is improved, the energy stability requirements of pumping light are low, different loading capabilities can be obtained by using the cylindrical lens beam amplification system with different beam amplification ratios, the shapes of outgoing light spots are identical to those of light before being fed, and the method and the device are applicable to fields such as inertial confinement fusion, impact intensification, optoelectronic countermeasure, laser radar and optical parametric oscillator pumping.

Description

Technical field [0001] The invention relates to serial beam grouping technology of lasers, and belongs to the optical field. Background technique [0002] Solid-state lasers with large energy, repetition frequency, and high beam quality have a wide range of applications in the fields of inertial confinement fusion, impact enhancement, optoelectronic countermeasures, lidar and optical parametric oscillator pumping. With the increase of repetition frequency and energy, the laser system relying solely on the main oscillation power amplification structure will be subject to technical problems such as the size of the gain medium, thermal influence and damage threshold, so that the stability and beam quality of the laser system cannot be guaranteed. At the same time, since the working state of each stage of the amplifying unit will affect the performance of the output light, the stability will also become worse as the amplifying unit increases. [0003] An effective way to establish a h...

Claims

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Application Information

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IPC IPC(8): G02B27/10
CPCG02F1/39H01S3/30
Inventor 吕志伟白振旭
Owner 吕志伟
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