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Diagnosis device for parameters of nuctual action between laser and plasma

A plasma and diagnostic device technology, applied in polarization spectrum, spectrum investigation, etc., can solve problems such as complex optical paths, and achieve the effects of ease of operation, cost reduction, and low cost

Inactive Publication Date: 2003-10-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of complex optical paths for generating probe light and adjusting delay in the prior art, further improves the sensitivity to tiny scattering signals, and is suitable for various laser systems, including the use of chirped pulse amplification (CPA) and the use of optical parametric chirp Ultra-short and ultra-intense laser system based on Chirp Pulse Amplification (OPCPA) technology

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  • Diagnosis device for parameters of nuctual action between laser and plasma
  • Diagnosis device for parameters of nuctual action between laser and plasma

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Embodiment Construction

[0019]The structure shown in Figure 1 is used to study the plasma wave process excited by ultrashort and ultra-intense lasers using chirped pulse amplification (CPA) and optical parametric chirped pulse amplification (OPCPA) technology. The focusing device 2 is composed of a first reflecting mirror 201 , a second reflecting mirror 202 and an off-axis parabolic focusing mirror 203 . The color filter 8 is a film-coated bandpass filter, which is highly transparent to scattered light with a wavelength of 740-765 nanometers, and highly reflective to unscattered light with a wavelength of 785 nanometers. The parameters of laser 1 are: central wavelength 785 nm, pulse width 45 femtoseconds, full width at half maximum 22 nm, and peak power 2 TW. The required pump light-probe light delay is between 100 femtoseconds and 5 picoseconds. After calculation, it is ideal to choose the birefringent crystal 103 as calcite crystal and lithium niobate crystal. For example, the delay interval of ...

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Abstract

A device for detecting the mutual action parameters between laser and plasma has light source unit and collecting-detecting unit, which are separated by the internal target in vacuum target chamber. Said light source unit is composed of laser device and focusing part. Said collecting-detecting unit consists of the first convex lens, polarization analyzer, the second convex lens, filter and receiver. Its advantages include simple structure, easy operation, correct delay, no loss, and high sensitivity.

Description

technical field [0001] The invention relates to a diagnostic device for interaction parameters between laser and plasma. It is especially suitable for the diagnosis of the parameters of the interaction between ultra-short and ultra-intense laser and plasma. Background technique [0002] Prior art [1]: American A.K.Lal et al. provided a dual-frequency CO 2 Small-angle Thomson scattering diagnostic device for laser-excited plasma waves (published in Phys.Plasmas 4(5), 1443, 1997). Its pump light is beat frequency CO 2 Laser (wavelengths 10.3 and 10.6 microns, full half-height pulse width 300 picoseconds, energy 70 joules), probe light wavelength 0.53 microns, full half-height pulse width 2 nanoseconds, incident at an angle of 87° to the pump light, Its time resolution is obtained by scanning with a streak camera with a resolution of 10 picoseconds. The shortcomings of this type of device are as follows: 1. The probe light source needs to be introduced separately, which is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/447
Inventor 汤宇晖韩申生
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI