Cascaded terahertz wave parametric oscillator

Abstract

The invention discloses a cascaded terahertz wave parametric oscillator, which comprises a pump source, an MgO: LiNbO3 crystal, a GaP crystal, a parabolic mirror, a polyethylene lens, a pump light recovery box, and reflectors arranged around the MgO: LiNbO3 crystal and the GaP crystal. First-stage Stokes light, second-stage Stokes light, third-stage Stokes light and fourth-stage Stokes light are incident on the GaP crystal, and then, forward terahertz waves and backwards terahertz waves are generated through a three-stage cascaded optical parametric effect. The forward terahertz waves pass through a fourth reflector vertically and are then focused and output by the polyethylene lens, and the backwards terahertz waves are reflected and output by the parabolic mirror. By changing the anglesbetween the pump light and the first-stage, second-stage, third-stage and fourth-stage Stokes light, four frequency-tuned Stokes light beams can be obtained simultaneously. The tuning method is simple, and the operation is flexible. Efficient terahertz waves can be obtained through a three-stage cascaded optical parametric effect by pumping the GaP crystal with the first-stage, second-stage, third-stage and fourth-stage Stokes light.

Description

technical field [0001] The invention belongs to the technical field of terahertz wave applications, and in particular relates to a cascaded terahertz wave parametric oscillator. Background technique [0002] Terahertz wave (Terahertz, referred to as THz), refers to the frequency of 0.1-10THz (1THz = 10 12 The electromagnetic wave in the THz range, whose waveband is between the millimeter wave and infrared in the electromagnetic spectrum, is the transition area between photonics and electronics, and macroscopic theory to microscopic theory. The special position of terahertz wave makes it widely used in basic research fields such as physics, chemistry, astronomy, molecular spectroscopy, life science and medical science, as well as medical imaging, environmental monitoring, material detection, food detection, radio astronomy, mobile communication, satellite Applied research fields such as communication and military radar have great scientific research value and broad applicati...

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Problems solved by technology

[0014] The purpose of the present invention is to provide a cascaded terahertz wave parametric oscillator to solve the problems of low power and low efficiency of the existing terahertz wave

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