Broadband tuning teraHertz wave generator based on modulator frequency shift and cyclic frequency shift

Abstract

The invention provides a broadband tuning teraHertz wave generator based on modulator frequency shift and cyclic frequency shift, comprising a laser, a circulator, a light beam splitter, a cyclic frequency shift link based on the modulator frequency shift, a light beam synthesizer, a photoisolator and a photoelectric transducer with a teraHertz radiating antenna, wherein light output by the laser passes through the circulator and then is divided into a first path and a second path by the light beam splitter; the light in the first path belongs to reference light; the light in the second path is input into the cyclic frequency shift link to generate cyclic frequency shift light; the reference light and the cyclic frequency shift light are superposed in the light beam synthesizer to generate beat frequency light in the range of teraHertz frequency; and the beat frequency light passes through the photoisolator and then is received by the photoelectric transducer with the teraHertz radiating antenna, and the photoelectric transducer with the teraHertz radiating antenna gives off coherent teraHertz waves. The generator provided by the invention has the advantages that the volume is small, and fewer optical elements are used, thus being easy to integrate, the tuning range is wide, the tuning efficiency is high and the generating efficiency of the teraHertz waves is high.

Description

technical field [0001] The invention relates to a broadband tuned terahertz wave generator, in particular to a broadband tuned terahertz wave light source based on the principles of modulator frequency shift, cyclic frequency shift and beat frequency. Background technique [0002] Terahertz (THz, 1THz=10 12 Hz) waves refer to electromagnetic waves whose operating frequency is in the range of 0.1 to 10 THz. The reason why terahertz wave can arouse the strong research interest of scientists is not because of its mysterious and little-known electromagnetic radiation, but mainly because it has many unique properties. It is these unique properties that endow terahertz science Wide application prospects. The unique properties of terahertz waves are mainly manifested in: perspective, safety, and spectral resolution. Terahertz radiation has good penetrability to many dielectric materials and non-polar liquids, so it can perform perspective imaging on non-transparent objects. In a...

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Problems solved by technology

[0005] In short, the above methods have narrow tuning width, bulky volume, low tuning efficiency, or low conversion efficiency

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