Multi-wavelength terahertz wave parametric oscillator

Abstract

The invention discloses a multi-wavelength terahertz wave parametric oscillator, which comprises a laser pump cavity and a terahertz wave parametric oscillation cavity, wherein the laser pump cavity consists of a totally reflecting mirror, a one-fourth wave plate, an electro-optical Q-switch device, a polarizer, a pulse laser pump source module, a micropore diaphragm and a laser output mirror; the terahertz wave parametric oscillation cavity comprises two right-angle prism resonance cavities respectively consisting of a right-angle prism, a reflector, a MgO:LiNbO3 crystal arranged between themicropore diaphragm and the laser output mirror, and a plurality of semi-circular output mirrors; and two silicon prism arrays are arranged on the surface of the MgO:LiNbO3 crystal. Pump light oscillating back and forth in the laser pump cavity is vertically transmitted to the MgO:LiNbO3 crystal, and two beams of oscillating Stokes light and two groups of four-beam terahertz waves are generated through excitation in the two right-angle prism resonance cavities, and are transmitted out of the silicon prism arrays. The continuous tunable output of the two groups of four-beam terahertz waves canbe realized, and the output energy is basically equal.

Description

technical field [0001] The invention relates to the technical field of terahertz wave optoelectronics, in particular to a multi-wavelength terahertz wave parametric oscillator. Background technique [0002] at 0.1-10THz (1THz=10 12 Hz) range of electromagnetic waves - terahertz waves, is a very valuable scientific research of electromagnetic radiation. With its special position in the frequency band and its characteristics of low energy and high penetration, terahertz wave technology is currently widely used in various basic research fields and applied research fields. However, the generation and detection technology of terahertz waves is still very backward compared with the mature microwave and optical technologies, which has become one of the most important factors restricting the development of modern terahertz technology. Therefore, developing a terahertz wave radiation source with excellent performance has become the goal pursued by scientific researchers and a pract...

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Problems solved by technology

[0005] Chinese patent application (application number: 200910069519.4) discloses a dual-wavelength tunable intracavity terahertz parametric oscillator and its use method. The cavity structure adopted is a flat-flat cavity type, and the anti-detuning performance is poor. The resonant cavity is easily disturbed by external factors and causes its misalignment, which limits its practical application

However, this terahertz wave parametric oscillator can only output a single beam of terahertz waves, and the "depolarization effect" of the corner cube leads to a decrease in the three-wave conversion efficiency of the parametric oscillation

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