System and method for generating teraHertz wave by using flight focusing

A terahertz and generating device technology, applied in the field of terahertz wave technology and laser, can solve the problems of phase matching and length limitation of terahertz radiation, and achieve the effect of strong scientific research and practical application value

Active Publication Date: 2018-05-18
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

In traditional schemes, the length of air plasma can only be balanced by plasma refraction and self-focusing, resulting in limited length and inability to phase-match with THz radiation

Method used

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  • System and method for generating teraHertz wave by using flight focusing
  • System and method for generating teraHertz wave by using flight focusing
  • System and method for generating teraHertz wave by using flight focusing

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0032] In the present invention, the principle of "flying focus" is as follows:

[0033] Diffraction components can make lasers of different frequencies correspond to focal lengths of different lengths, and a chirped laser pulse is a laser pulse whose frequency changes periodically with time. Therefore, lasers of different frequencies in the chirped laser pulse pass through the diffraction components. The focal length will also be different, so as to realize t...

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Abstract

The invention discloses a system and method for generating teraHertz waves by using flight focusing, wherein the system for generating the teraHertz waves by using the flight focusing comprises a chirped signal generating device and a flight focusing device, wherein the chirped signal generating device is used for generating chirped laser pulse; the flight focusing device uses a diffraction element for focusing the chirped laser pulse so as to stimulate and generate air plasma and to further generate the teraHertz waves. The chirped laser pulse and the diffraction element are combined by the system and method for generating teraHertz waves by using flight focusing provided by the invention, so that the moving speed of the peak value intensity of the laser focus point region is controlled;the propagation of the laser light beams in the focusing regions can be controlled; in addition, the propagation length is many times of the Rayleigh length. Compared with the existing method for generating the teraHertz waves by the air, the method provided by the invention has the advantages that the intensity of the teraHertz waves generated by the method is greatly enhanced; the blank in the technical field of the existing high-intensity teraHertz wave generation is filled; high scientific research and practical application values are realized.

Description

technical field [0001] The present invention relates to the field of terahertz wave technology and laser, in particular, it relates to a combination of chirped laser pulses and diffraction components to achieve the purpose of controlling the movement speed of the air plasma generated by excitation in the focus area and thereby generate high Systems and methods for intensity terahertz waves. Background technique [0002] In recent years, with the development of terahertz source technology, the method of using air to generate terahertz waves stands out from many terahertz source technologies due to its advantages of no damage threshold and long-distance generation, and has been well applied in practice. . In order to obtain more high-quality terahertz waves, the system that uses air to generate terahertz waves has been continuously optimized. [0003] The generation of terahertz waves mainly depends on the plasma density gradient or the generation of unsteady current in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/02H01S3/00
CPCH01S1/02H01S3/0057
Inventor 张亮亮蒋广通谭永冯世嘉张存林
Owner CAPITAL NORMAL UNIVERSITY
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