A Terahertz Radiation Source Based on Optical Parametric Effect and Optical Difference Frequency Effect

Abstract

The invention discloses a Terahertz radiation source based on an optical parameter effect and an optical difference frequency effect. The Terahertz radiation source comprises a pumping source, a telescope beam shrinking system, a first reflecting mirror, a first optical beam scanner, a resonant cavity consisting of two optical glasses, a reflecting mirror group and a second optical beam scanner. A MgO:LiNbO3 crystal is arranged in the resonant cavity, and a silicon prism is arranged on the side face of the MgO:LiNbO3 crystal. The Terahertz radiation source is simple in structure, and the parameter process and the difference frequency process can be achieved at the same time in the low-cost MgO:LiNbO3 crystal. The acquiring mode of two difference frequency beams in the difference frequency process is simple, and the entire system is compact in structure, good in stability and low in cost. The incident angle of pumping light is changed by changing the direction of the optical beam scanners, so that the included angle of the pumping light and the axis of a Stokes optical resonant cavity is changed, and thus frequency tuning output of THz waves can be achieved. The tuning mode is simple, and operation is flexible. The pumping light is recycled, due to the fact that the optical parameter process and the optical difference frequency process are achieved at the same time, the output power of the THz waves can be effectively improved, and the optical conversion efficiency of the THz waves is improved.

Description

technical field [0001] The invention relates to a terahertz radiation source based on an optical parameter effect and an optical difference frequency effect. Background technique [0002] Terahertz (Terahertz, referred to as THz, 1THz=10 12 Hz) waves refer to electromagnetic waves with a frequency in the range of 0.1-10 THz, and its wave band is between millimeter waves and infrared waves. The interaction between THz waves and matter contains rich physical, chemical and biological information. The rotation and collective vibration frequencies of various condensed matter and biomacromolecules are in the THz frequency band. Therefore, THz waves are used in high-resolution spectroscopy, medicine Imaging, food safety detection, environmental monitoring, space communication and national defense security and other fields have a wide range of application values. One of the main technical bottlenecks currently limiting the rapid development of THz wave technology is the lack of co...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a terahertz radiation source based on the optical parametric effect and the optical difference frequency effect, so as to solve the problems of high cost, low efficiency and complicated structure of the existing terahertz generating devices

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