A high-frequency terahertz wave generation device using Raman characteristic peak difference frequency

Abstract

The invention provides a high-frequency terahertz wave generation device by using Raman characteristic peak difference frequency. The device is characterized by comprising a pulse laser oscillator, afront amplification light path, a main amplification light path and a gallium selenide quartz plate. The pulse laser oscillator is used for generating a pulse laser; the front amplification light pathis connected with an output port of the pulse laser oscillator and used for amplifying the power of the pulse laser and obtaining a high-power laser with the power larger than a power threshold valueof stimulated Raman scattering; the main amplification light path is connected with an output port of the front amplification light path and used for amplifying the power of the high-power laser andconducting stimulated Raman scattering at the same time to obtain a laser containing Raman characteristic peaks of different wavebands; the gallium selenide quartz plate and an output port of the mainamplification light path are correspondingly arranged, and the gallium selenide quartz plate is used for modulating the Raman characteristic peaks to make the Raman characteristic peaks of differentwavebands have nonlinear difference frequency effect to obtain high-frequency terahertz waves. The high-frequency terahertz wave generation device is not limited by an ultra-high-power excitation light source, the nonlinear effect does not need to be inhibited, and the component of the Raman spectrum generated through stimulated Raman scattering is rich.

Description

technical field [0001] The invention belongs to the technical field of microwave photonics, and in particular relates to a high-frequency terahertz wave generating device using Raman characteristic peak difference frequency. Background technique [0002] The frequency band of a single terahertz pulse can cover the range from GHz to tens of THz, which is convenient for analyzing the spectral properties of substances in a large range. Therefore, terahertz wave can become a complementary technology of infrared spectroscopy and Raman spectroscopy in terms of spectroscopy. In the 1960s, the successful development of lasers accelerated the development of nonlinear optical technology and provided conditions for people to study new methods of generating terahertz waves. The emergence of laser diodes and more new types of nonlinear crystals has also enabled people to use nonlinear optical methods to obtain terahertz radiation. Although terahertz technology is developing rapidly, th...

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Problems solved by technology

However, this method requires ultra-high-power carbon dioxide lasers or tunable lasers as excitation light sources to generate high-frequency terahertz radiation, which is limited by the use of lasers, which greatly limits its large-scale application.

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