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Method for obtaining flat-topped light beam utilizing secondary stimulated Brillouin scattering light amplitude limiting

A stimulated Brillouin and flat-top beam technology, applied in the field of nonlinear optics, can solve the problems of low damage threshold, flexible adjustment of transmittance function, inability to apply strong laser system safety protection, etc. The method is simple and flexible. Effect

Inactive Publication Date: 2006-03-01
HARBIN INST OF TECH
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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 the non-linear optical limiting mechanism cannot be applied to the safety protection of strong laser systems due to the relatively low damage threshold, and the existing method for obtaining a flat-top beam cannot be used because the components are designed for a specific beam. The problem of flexibly adjusting the transmittance function as the beam parameters change, thus providing a method to obtain a flat-top beam by using twice stimulated Brillouin scattering light limiting, which is based on the principle of stimulated Brillouin scattering (SBS) The method of turning Gaussian light into a flat-hat beam

Method used

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  • Method for obtaining flat-topped light beam utilizing secondary stimulated Brillouin scattering light amplitude limiting
  • Method for obtaining flat-topped light beam utilizing secondary stimulated Brillouin scattering light amplitude limiting
  • Method for obtaining flat-topped light beam utilizing secondary stimulated Brillouin scattering light amplitude limiting

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specific Embodiment approach 1

[0010] Specific implementation mode one: combine figure 1 Describe this specific embodiment, the twice stimulated Brillouin scattering system of this specific embodiment consists of a polarizer 1, a 1 / 4 wave plate 2, a first convex lens 3, a first oscillation pool 4, a second convex lens 5, a second The oscillating pool 6 and the laser 7 are composed, and the method for realizing light limiting to obtain a flat-top beam in this specific embodiment is: the p-polarized light output by the laser 7 is input to the input end of the polarizer 1, then transmitted through the polarizer 1 and transmitted from the polarizer 1 The output end of the 1 / 4 wave plate 2 is output to the input end of the 1 / 4 wave plate 2, after the transmission transformation of the 1 / 4 wave plate 2, the circularly polarized light is obtained at the output end of the 1 / 4 wave plate 2 and input to the input end of the first convex lens 3 Among them, the circularly polarized light transmitted by the first conve...

specific Embodiment approach 2

[0011] Specific implementation mode two: combination figure 1 Describe this specific embodiment, in specific embodiment one, the medium in the described first oscillating pool 4 and the medium in the described second oscillating pool 6 are selected to have an absorption coefficient less than 0.005 cm -1 (per centimeter) of the Brillouin medium. The smaller the absorption coefficient is, the higher the energy of the SBS optical limiting output is. Therefore, in order to increase the energy of the optical limiting output of the present invention, a Brillouin medium with a small absorption coefficient is selected.

specific Embodiment approach 3

[0012] Specific implementation mode three: combination figure 1 To describe this specific embodiment, in the first specific embodiment, the gain coefficient of the medium in the first oscillating cell 4 is determined by the energy of the required top-hat beam. Since the SBS optical limiting output energy is determined by the system index gain coefficient (G=gIL formula, G is the system index gain coefficient, g is the medium gain coefficient, L is the effective length of action, and I is the light intensity), the smaller the gain coefficient is , the trailing edge platform generated after the first SBS action is high, and the energy of the required flat-top beam is high; the larger the gain coefficient is, the trailing edge platform generated after the first SBS action is lower, and the required flat-top beam energy is Energy is low.

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Abstract

The invented method includes the following steps: making focal point of first lens be fallen in first oscillating cell, making the light transmitted by first lens produce first SBS in the focal point position of first lens, utilizing second lens to transfer the transmission light outputted from first oscillating cell and making it produce second SBS in the focal point position of second lens, also making focal point of second lens be fallen in second oscillating cell, so that the light outputted from second oscillating cell is flat-top beam.

Description

technical field [0001] The invention relates to the field of nonlinear optics, in particular to a method for obtaining flat-hat light beams by using stimulated Brillouin scattered light limiting. Background technique [0002] In high-power and strong laser systems, the output laser power density is often so high that it causes damage to various optical materials in the laser system, such as optical crystals, lenses, and various optical coatings. Safety protection; In addition, for the sake of safety, the laser system generally can only work in the range below the rated power, which makes the working efficiency of the laser system very low. If the protective measures for the laser system are proper, the laser system can be operated at a higher power state as much as possible to improve the working efficiency of the system. For this reason, the laser light limiter is one of the better protective measures. Optical clipping mechanisms based on various nonlinear effects have bee...

Claims

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Application Information

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IPC IPC(8): G02F1/377
Inventor 哈斯乌力吉吕志伟王雨雷巴德欣何伟明林殿阳
Owner HARBIN INST OF TECH
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