Compact type optical difference-frequency THz source

Abstract

The invention discloses a compact type optical difference-frequency THz source, which comprises a dual-wavelength laser and a difference-frequency device, wherein the dual-wavelength laser and the difference-frequency device are sequentially arranged. The dual-wavelength laser comprises a pump source, a laser reflective mirror, a laser crystal, a Q switch and a laser output mirror, wherein the above parts are arranged in turn. The difference-frequency device comprises a laser focusing lens and a difference frequency crystal, wherein the laser focusing lens and the difference frequency crystal are arranged in turn. The pump laser emitted by the pump source is injected into the laser crystal. Through the energy level transition process, activated particles inside the laser crystal are transited into the upper level to generate the laser oscillation inside an oscillation cavity formed by the laser reflective mirror and the laser output mirror. The laser crystal is composed of two crystals used for generating the laser oscillation at two wavelengths. By means of the Q switch, the loss of the oscillation cavity is adjusted, so that the pulse laser can be outputted. The outputted laser is injected into the difference frequency crystal after being focused through the laser focusing lens to generate the difference frequency effect, generate and output terahertz waves. The compact type optical difference-frequency THz source is compact in structure, and can be applied to small-cost, miniaturized and portable demand scenarios.

Description

technical field [0001] The invention relates to the field of solid-state lasers and nonlinear optical frequency conversion, and more specifically relates to a compact and stable dual-wavelength laser and an optical difference frequency terahertz source. Background technique [0002] Terahertz (Terahertz or THz) radiation is an electromagnetic wave with a frequency of 0.1-10THz and a typical center frequency of 1THz. Its wave band is between microwave and infrared, and it is an important electromagnetic wave band for the transition from macroelectronics to microphotonics. Terahertz waves are used in basic research fields such as physics, chemistry, astronomy, molecular spectroscopy, life science and medical science, as well as medical imaging, security inspection, environmental monitoring, material analysis, food testing, radio astronomy, mobile communication, satellite communication and military radar and other applied research fields have great scientific research value and...

AI Technical Summary

Problems solved by technology

However, the scheme of using two semiconductor lasers and two resonators greatly increases the cost, and is not conducive to the miniaturization of dual-wavelength lasers and the overall terahertz source

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