Terahertz amplification method for photoinduced liquid plasma grating and device thereof

A plasma and amplification device technology, applied in the field of terahertz detection, can solve the problems of slow electron movement, low ionized liquid strength, and low electron density, so as to speed up the movement speed, promote the generation of high-frequency terahertz, and increase the The effect of plasma density

Inactive Publication Date: 2020-04-14
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

However, limited by the intensity of the pump laser and the thickness of the water film, the electron movement speed is slow and the electron density is not high, which further leads to the low intensity of the terahertz wave generated by the ionized liquid.

Method used

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  • Terahertz amplification method for photoinduced liquid plasma grating and device thereof
  • Terahertz amplification method for photoinduced liquid plasma grating and device thereof

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Experimental program
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specific Embodiment approach

[0032] The specific implementation method comprises the following steps:

[0033] Step 1: Divide the output laser light of the ultrashort pulse laser into two beams; use a beam splitter to realize the beam splitting of the output laser light, and the beam splitter is a spatial beam splitter or a polarization beam splitter prism.

[0034]Step 2: The two laser pulses are time-synchronized by time delay and form a plasma grating; select one laser pulse split by the beam splitter as the delay-adjustable beam (Beam 1), and the other laser pulse (Beam 1) 2) After passing through the reflector, it enters the focusing lens in parallel with the adjustable light beam, and is focused on the liquid substance and ionized to form a light filament. By adjusting the time delay of the adjustable beam and observing the plasma fluorescence intensity in the intersection area of ​​the two laser beams with the naked eye, when the two laser beams are synchronized, the plasma fluorescence will be sig...

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Abstract

The invention provides a terahertz amplification method for a photoinduced liquid plasma grating and a device thereof. According to the method, two beams of ultra-short pulse laser which are mutuallycrossed in time synchronization and space are used for ionizing a liquid substance to generate a plasma grating; terahertz amplification is achieved by increasing the electron density, accelerating electrons and conducting coherent superposition on a terahertz electric field, the plasma grating terahertz amplification device facilitates implementation of a plasma grating terahertz amplification method, and therefore the generated terahertz intensity is greatly improved.

Description

technical field [0001] The invention relates to the technical field of terahertz detection, in particular to a photoinduced liquid plasma grating terahertz amplification method and device. Background technique [0002] In recent years, with the development of terahertz technology, a large number of studies have proved that light-rectifying crystals, metals or air plasmas are good terahertz sources. Among them, when using optical rectifier crystals to generate terahertz, the optical rectifier crystals have a certain damage threshold, and some metals and their microstructures also have defects with low damage thresholds, which largely limit the generation of high-power terahertz waves. Terahertz waves can also be generated by using laser plasma. Ultrashort strong-field lasers are focused in the air to form plasma filaments, and terahertz pulses of cone-shaped radiation can be received in the direction of laser transmission. In order to further enhance the intensity of terahert...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H1/24G02B5/18
CPCG02B5/18H05H1/24
Inventor 夏宇李敏王锋卢文晖吕海慧
Owner UNIV OF SHANGHAI FOR SCI & TECH
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