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Circulating ultrasonic grating frequency shift nonlinear difference-frequency type broadband tuning terahertz wave generator

A technology of cyclic ultrasonic wave generator, applied in the field of broadband tuned terahertz wave light source, can solve the problems of low tuning efficiency, narrow tuning width, and low conversion efficiency, and achieve high tuning efficiency, large tuning width, and high conversion efficiency Effect

Inactive Publication Date: 2011-11-23
SHENZHEN UNIV
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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

Method used

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  • Circulating ultrasonic grating frequency shift nonlinear difference-frequency type broadband tuning terahertz wave generator
  • Circulating ultrasonic grating frequency shift nonlinear difference-frequency type broadband tuning terahertz wave generator
  • Circulating ultrasonic grating frequency shift nonlinear difference-frequency type broadband tuning terahertz wave generator

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0034] The present invention provides a cyclic ultrasonic grating frequency shift nonlinear difference frequency broadband tuned terahertz wave generator, such as figure 1 As shown, it includes a laser 1, a first circulator, an optical beam splitter 3, a cyclic frequency shifting link 4 based on ultrasonic grating frequency shifting, a first beam combiner, an optical isolator 6, a nonlinear element 7 and a terahertz filter slice 8. The light output by the laser 1 is divided into the first path and the second path by the optical beam splitter 3 after passing through the first circulator. frequency light, the reference light and the cyclic frequency-shifted light are combined by the first beam combiner, and then frequency difference is performed in the nonlinear element 7 through the optical isolator 6, and finally the coherent light is radiated ...

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Abstract

The invention provides a circulating ultrasonic grating frequency shift nonlinear difference-frequency type broadband tuning terahertz wave generator which comprises a laser, a first circulator, a beam splitter, an ultrasonic grating frequency shift based circulating frequency shift link, a first beam synthesizer, a photoisolator, a nonlinear element and a terahertz wave filter, wherein light output by the laser is split into a first path of light and a second path of light by the beam splitter after passing through the first circulator, the first path of light is used as reference light and the second path of light is input to the circulating frequency shift link to generate circulating frequency shift light, the first beam synthesizer is used for carrying out difference frequency on the reference light and the circulating frequency shift light by the photoisolator in the nonlinear element after the reference light and the circulating frequency shift light are synthesized and then coherent terahertz waves are generated through filtering radiation of the terahertz wave filter. The circulating ultrasonic grating frequency shift nonlinear difference-frequency type broadband tuning terahertz wave generator provided by the invention has the advantages of small volume, less quantity and easiness in integration of optical elements, large tuning range, high tuning efficiency and high terahertz wave generation efficiency.

Description

technical field [0001] The invention relates to a broadband tuned terahertz wave device generated by a difference frequency method, in particular to a broadband tuned terahertz wave light source based on the principles of ultrasonic grating frequency shift, circular frequency shift and difference 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 per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/02
Inventor 欧阳征标祁春超
Owner SHENZHEN UNIV
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