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Device for measuring medium brillouin gain linetype and line width and a method for measuring medium brillouin gain linetype and line width based on device

A medium and line-type technology, applied in the field of laser nonlinearity, can solve the problems of Stokes signal measurement results being affected and low reliability of measurement results, etc., and achieve the effect of simple, effective and high reliability measurement

Active Publication Date: 2012-12-05
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the current measurement of Brillouin linetype and linewidth has low reliability of the measurement results and that the linewidth of the Stokes signal itself has an influence on the measurement results of Brillouin linetype and linewidth, the present invention proposes the measurement Device for medium Brillouin gain line shape and line width and method for measuring medium Brillouin gain line shape and line width based on the device

Method used

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  • Device for measuring medium brillouin gain linetype and line width and a method for measuring medium brillouin gain linetype and line width based on device
  • Device for measuring medium brillouin gain linetype and line width and a method for measuring medium brillouin gain linetype and line width based on device
  • Device for measuring medium brillouin gain linetype and line width and a method for measuring medium brillouin gain linetype and line width based on device

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specific Embodiment approach 1

[0030] Specific implementation mode 1. Combination Figures 1 to 3 Specifically illustrate this embodiment, the device for measuring medium Brillouin gain line shape and line width described in this embodiment, it includes laser source 1, 1 / 2 wave plate 2, Stokes light generation system 3, the first 1 / 4 Wave plate 4, first polarizer 5, chopper 6, second total reflection mirror 7, first total reflection mirror 8, third polarizer 9, third 1 / 4 wave plate 10, amplification cell 11, second 1 / 4 wave plate 12, the second polarizer 13, the third total reflection mirror 14, measurement system 15 and energy meter 16, described Stokes light generation system 3 includes focusing lens 3-1 and SBS generation pool 3-2, Measurement system 15 includes attenuator 15-1, F-P interference scanner 15-2, photomultiplier tube 15-3, sampling integrator 15-4 and computer 15-5,

[0031] The laser source 1 emits pulsed laser light incident on the 1 / 2 wave plate 2, the pulsed laser light transmitted throug...

specific Embodiment approach 2

[0037] Specific embodiment two, combine Figures 1 to 3 Specifically explain this embodiment, based on the method for measuring the medium Brillouin gain line shape and line width of the device for measuring the medium Brillouin gain line shape and line width described in the first embodiment, the laser source 1 emits pulsed laser light incident on the 1 / 2 wave plate 2, the pulsed laser light transmitted through the 1 / 2 wave plate 2 is incident on the first polarizer 5, and the pulsed laser light through the first polarizer 5 is divided into linearly polarized light S in S state 11 and P-state linearly polarized light P 21 ,

[0038] The S state of linearly polarized light S 11 The linearly polarized light S reflected by the first polarizer 5 11 Incident to the first 1 / 4 wave plate 4, the circularly polarized light O transmitted through the first 1 / 4 wave plate 4 11 Incident to the focusing lens 3-1 of the Stokes light generating system 3, the circularly polarized light O...

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Abstract

The invention relates to a device for measuring a medium brillouin gain linetype and a line width and a method for measuring the medium brillouin gain linetype and the line width based on the device and aims to solve the problems existed in the measurement of the brillouin gain linetype and the line width that the measuring result credibility is low, and the own line width of a Stokes signal affects the measuring results of the brillouin gain linetype and the line width. The invention comprises the following steps: transmitting a laser pulse through a laser source, generating Stokes signal light through a Stokes light generation system, carrying out frequency spectrum measurement on Stokes light by a measuring system, controlling the passing and not passing of pump light in a light path by utilizing a chopper, further controlling the amplified incident Stokes light or the Stokes light before amplification, and measuring the medium brillouin gain linetype and the line width according to the information before and after the amplification of Stokes light frequency spectrum. The device and the method are applicable to the laser nonlinear field.

Description

technical field [0001] The invention relates to the field of laser nonlinearity. Background technique [0002] Stimulated Brillouin Scattering (SBS) is an important research direction in the field of nonlinear optics. Some special properties of SBS, such as phase conjugation, pulse width compression, pulse amplification, and research on slow light, are favored by researchers from all over the world, and are used in seawater salinity, temperature monitoring, bridge, pipeline stress monitoring, etc. It has broad application prospects. [0003] In the research on SBS, the Brillouin linetype and linewidth of the medium have always been a very important parameter. Although the measurement of Brillouin line shape and line width in optical fiber is very mature, there is no simple and feasible method for measuring the Brillouin line shape and line width of liquid, solid, and gas media. It was proposed to adopt a vibration-amplification double-cell structure to change the central ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00G01N21/63
Inventor 吕志伟陈义王雨雷张昀
Owner HARBIN INST OF TECH
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