Method for generating terahertz waves in non-linear crystal through cascade difference frequency and cavity phase matching by infrared laser

A nonlinear crystal, infrared laser technology, applied in the field of infrared laser, can solve problems such as low conversion efficiency

Inactive Publication Date: 2017-12-01
JIANGXI NORMAL UNIVERSITY
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Problems solved by technology

[0006] In order to overcome a series of problems in the background technology, the present invention provides a method for cascading Nd:YAG lasers in an organic crystal to generate terahertz waves by cavity phase matching with difference frequency. The disadvantage of low conversion efficiency

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  • Method for generating terahertz waves in non-linear crystal through cascade difference frequency and cavity phase matching by infrared laser

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[0023] The present invention will be described in more detail below by means of examples, but the following examples are only illustrative, and the protection scope of the present invention will not be limited by the following examples.

[0024] The invention is based on the fact that two beams of light with different wavelengths pass through the optical second-order nonlinear effect of a nonlinear crystal to generate stable and tunable terahertz waves. In this process, the two beams of pump light and terahertz light with similar wavelengths will simultaneously satisfy the energy conservation condition and the quasi-phase matching condition. In this embodiment, more than 10 orders of cascading and cavity phase matching are used. Optical nonlinear crystals include inorganic nonlinear crystals and organic nonlinear crystals. Inorganic crystals include Gap, GaAs, and ZnGeP 2 , GaSe, LiNbO 3 , KTP, ZnTe, etc. Organic crystals include DSTMS crystals, OH1 crystals, and DAST crystal...

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Abstract

The invention discloses a method for generating tunable terahertz waves in a non-linear crystal by Nd:YAG laser, and in a cascade effect, an extremely small wave vector phase mismatching amount is maintained in a wide range so that generation conditions of the cascade effect can be satisfied. In the cavity phase matching, the cascade coherence length needs to be minimum to realize generation of high-power terahertz waves. The method for generating the terahertz waves in the non-linear crystal by employing cavity phase matching and cascade difference frequency by the Nd:YAG laser includes steps: 1) generating two beams of stably running tunable infrared laser by employing a Nd:YAG laser capable of directly realizing similar dual-wavelength stable running; 2) enabling the propagation directions of the two beams of infrared laser to be collinear; 3) placing the non-linear crystal on an optical path of the laser beam, wherein the length of the non-linear crystal needs to simultaneously satisfy a cascade effect condition and a cavity phase matching condition; and 4) changing the wavelength variable of two infrared laser beams output by the Nd:YAG laser. According to the method, the generated terahertz waves display wider application prospect in various fields.

Description

technical field [0001] The invention relates to the field of infrared lasers, in particular to a method for generating tunable terahertz waves in an optical nonlinear crystal using an Nd:YAG laser with a multi-level structure and capable of directly realizing similar dual-wavelength stable output. Background technique [0002] Terahertz-wave (THz) wave sources have received great attention as a powerful tool for future high-speed wireless communication, nondestructive evaluation, and medical diagnosis. Terahertz waves usually refer to electromagnetic waves (1THz=10 12 Hz), which lies between microwave and infrared waves in the electromagnetic spectrum. This band is an electromagnetic radiation area that has great scientific research value but has not yet been fully researched and developed. Terahertz science and technology integrates the characteristics of electronics and photonics. The long-wave band overlaps with millimeter waves (sub-millimeter waves), which is mainly e...

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Application Information

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IPC IPC(8): H01S1/02G02F1/35
CPCG02F1/3544G02F2203/13H01S1/02
Inventor 饶志明黄俊滔
Owner JIANGXI NORMAL UNIVERSITY
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