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Femtosecond laser plasma channel length measuring device and method

A plasma and femtosecond laser technology, applied in the field of plasma detection, can solve the problems of complex cabinet design, cumbersome disassembly, etc., and achieve the effects of simple device and optical path, wide application prospects, and good operability

Inactive Publication Date: 2016-06-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In [201510054206.7], a sealed laser-induced high-voltage discharge simulation system was invented, including an air extraction device and a water cooling device to realize the temperature and pressure adjustment in the metal experiment box. It is impossible to observe and detect experimental phenomena from above the metal experimental box

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  • Femtosecond laser plasma channel length measuring device and method

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Embodiment Construction

[0019] The present invention is described in detail below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this:

[0020] see figure 1 , figure 1 It is a structural schematic diagram of the measurement device for the femtosecond laser plasma channel length of the present invention. As can be seen from the figure, a device for measuring the length of a femtosecond laser plasma channel includes a Ti:Sapphire laser 1, a focusing lens 2, a metal Faraday cage 4, a beam collecting device 9, a high voltage power supply 10, a plexiglass substrate 12, and an insulating plastic rod 7 , metal tapered electrode 5 and digital camera 11.

[0021] The metal Faraday cage 4 has four metal sides, wherein the center of two corresponding sides is respectively provided with a first laser light-through window 3 and a second laser light-through window 8, and the bottom surface of the metal Faraday cage 4 is provided with a...

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Abstract

The invention provides a femtosecond laser plasma channel length measuring device and method. The device includes a Ti sapphire laser, a focusing lens, a metal Faraday cage, a light beam collecting device, a high voltage power source, an organic glass substrate, an insulation plastic rod, a metal conical electrode and a digital camera. According to the invention, femtosecond laser filamentation is utilized for inducing corona discharge, the inner ionization degree of a femtosecond laser plasma channel is intensified by using an electric field, so that a weak ionization area which is not easy to detect becomes easy to detect under the effect of the electric field. Besides, the digital camera is used for taking fluorescent pictures showing that laser induces corona discharge, so that precise measurement of the femtosecond laser plasma channel is realized. The device is simple and practical and can be used for measuring the length of the femtosecond laser plasma channel directly. The method which is more accurate, simple and convenient is provided for femtosecond laser plasma length measurement.

Description

technical field [0001] The invention relates to plasma detection, in particular to a device and method for measuring the length of a femtosecond laser plasma channel. Background technique [0002] During the transmission of the strong femtosecond laser in the air, when the self-focusing caused by the Kerr effect and the defocusing caused by the plasma after ionizing the air reach a dynamic balance, the laser is self-guided and transmitted in the air, A very long plasma channel is formed, which is the phenomenon of filamentation. This stable long plasma channel shows many new physical processes of research significance and potential broad application prospects. The determination of the length of the plasma channel is of great significance for the application of femtosecond laser in lidar, long-range detection and laser lightning. [0003] A.Iwasak et al once proposed in the article "ALIDARtechniquetomeasurethefilamentlengthgeneratedbyahigh-peakpowerfemtosecondlaserpulseinai...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
CPCG01B11/022
Inventor 王铁军刘尧香李儒新刘建胜孙海逸杜盛喆
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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