Broad-tuning waveguide terahertz radiation source

Abstract

The invention discloses a broad-tuning waveguide terahertz radiation source. The broad-tuning waveguide terahertz radiation source comprises a laser pump source, a dual-wavelength parametric oscillator, a cylindrical lens and a panel waveguide, wherein the laser pump source outputs 532nm Q-switched pulses to the dual-wavelength parametric oscillator, the dual-wavelength parametric oscillator generates dual-wavelength pulses which are within the range, wherein the center of the range is a degeneracy point, and the radius of the range is 1064nm, the dual-wavelength pulses are focused through the cylindrical lens, and are coupled to a core layer of the panel waveguide, narrow-linewidth THz waves are generated through the second-order non-linear difference frequency effect, a THz radiation mode is generated through the Cherenkov phase matching mode, and sidewise coupling output is achieved. Due to the fact that the structure is adopted, the tuning range is expanded, broadband tuning within the range from 0.1THz to 7THz can be achieved, high-efficiency coupling of the THz waves is achieved, coherent THz radiation output with broad tuning and the narrow linewidth is finally achieved, and the broad-tuning waveguide terahertz radiation source can be widely applied to the fields such as the biomedicine imaging field, the high-resolution spectral analysis field, the material detection field and the medical diagnosis field.

Description

technical field [0001] The invention relates to the field of terahertz radiation sources, in particular to a wide tuning waveguide terahertz radiation source. Background technique [0002] Terahertz (Terahertz, referred to as THz, 1THz=10 12 Hz) band refers to the electromagnetic spectrum region with a frequency from 100 GHz to 10 THz, corresponding wavelengths from 3 mm to 30 microns, and a wide spectrum range between microwaves and infrared rays. Its special position in the electromagnetic spectrum gives it a series of special properties. THz radiation source technology is the key core technology for the development of science and technology in the THz field. Coherent THz radiation sources with wide tuning and narrow linewidth, with their high spectral resolution and spectral power density, have broad application prospects in the fields of high-resolution spectrum analysis, low molarity gas detection, biomedical diagnosis and dangerous goods detection. . [0003] Nonli...

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Problems solved by technology

[0005] On the one hand, the operation of the above two kinds of angle tuning is relatively complicated, and the tuning range is limited by the phase matching angle; on the other hand, due to the limitation of the crystal growth process, it is difficult to obtain large-sized and high-quality crystals

The above shortcomings restrict its application in the fields of biomedical spectral analysis and safety detection.

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