Femtosecond Laser Filamentation Plasma Density Measuring Device and Measuring Method

A plasma and femtosecond laser technology, applied in the field of plasma, can solve problems such as uneven longitudinal distribution of plasma and measurement errors, and achieve high time resolution, high time resolution, and direct measurement methods

Active Publication Date: 2021-05-04
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A femtosecond laser filament filament plasma density measurement device and measurement method, in which the femtosecond laser is divided into three beams through two beam splitters, which are respectively used as pump light, the first probe light P1, and the second probe light P2 . The pump light filaments in the air cavity to form a plasma channel, the first probe light P1 passes through the plasma channel as the carrier of the plasma introduction change, and then the second probe light P2 observes the value of the change through cross-correlation measurement so that Inversely deduces the plasma density. Secondly, the problem of uneven longitudinal distribution of plasma is solved by lateral fluorescence distribution. The invention has the characteristics of high time resolution ability, 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap