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Femtosecond laser filamentation plasma density measuring device and measuring method

A plasma and femtosecond laser technology, applied in the field of plasma, can solve the problems of uneven longitudinal distribution of plasma, measurement error, etc., and achieve the effects of direct measurement method, high time resolution capability, and convenient adjustment

Active Publication Date: 2018-12-28
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

The device can measure the plasma density more accurately and with higher time resolution, which solves the measurement error problem caused by the uneven longitudinal distribution of the plasma in the filament

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  • Femtosecond laser filamentation plasma density measuring device and measuring method
  • Femtosecond laser filamentation plasma density measuring device and measuring method
  • Femtosecond laser filamentation plasma density measuring device and measuring method

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited thereby.

[0024] see figure 1 , figure 1 It is a schematic diagram of the optical path of the femtosecond filamentation plasma density measuring device of the present invention. It can be seen from the figure that the femtosecond laser filamentation plasma density measurement device of the present invention includes a pump detection part, a cross-correlation measurement part and a lateral fluorescence measurement part.

[0025] The pump detection part mainly includes: the femtosecond light generated by the femtosecond laser 1 is divided into two beam paths through the beam splitter 2, one of which is divided into 90% of the energy as the pump light, and the other The beam obta...

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Abstract

A femtosecond laser filamentation plasma density measuring device and a measuring method, wherein the femtosecond laser is divided into three beams through two beam splitting plates, which are respectively used as pump light, first detecting light P1, and second detecting light P2. The pump light is performed a filamentation in an air cavity to form a plasma channel. The first detecting light P1 passes through the plasma channel to be a carrier for the plasma to introduce a variation. The second detecting light P2 observes the value of the variation through mutual observation so as to obtain the plasma density by reverse derivation. The problem that the longitudinal distribution of the plasma is not uniform is solved through the lateral fluorescence distribution. The femtosecond laser filamentation plasma density measuring device and the measuring method have the advantages of being high in time resolution capability, convenient adjustment and accurate measurement.

Description

technical field [0001] The invention relates to strong-field laser plasma, in particular to a measurement device and method for measuring the density of femtosecond laser filamentation plasma. Background technique [0002] The femtosecond laser is focused into the gas medium. With the reduction of the focused spot, the optical density will gradually increase to ionize the gas to generate plasma, and the high-density plasma will introduce the plasma defocusing effect. In this way, Kerr self-focusing and plasma When the volume defocus reaches dynamic equilibrium, filaments will be formed (see A. Braun, et al Opt. Lett. 20, 73, 1995). When people study the interaction between femtosecond laser and gas, many physical phenomena in the plasma channel have been observed, such as multifilament phenomenon, supercontinuum generation, cone radiation, etc., so the diagnosis of plasma characteristics can be obtained More physical information. However, the "survival" time of the femtose...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/24
CPCG01N9/24
Inventor 陈锦明姚金平储蔚刘招祥许波万悦芯张方波程亚徐至展
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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