Terahertz-wave parametric oscillator based on corner-cube prism resonant cavity

Abstract

The invention provides a terahertz-wave parametric oscillator based on a cube-corner prism resonant cavity, which is characterized in that the resonant cavity is formed by a right-angle trihedral cube-corner prism and an output mirror; the right-angle trihedral cube-corner prism can rotate around a cavity axis of the resonant cavity; the resonant cavity is internally provided with a MgO: LiNbO3 crystal; a silicon prism array is put on the surface of the MgO: LiNbO3 crystal; and a polarizer is arranged between the right-angle trihedral cube-corner prism and the MgO: LiNbO3 crystal according to a Brewster angle; pumplight is incident to the resonant cavity to simulate the MgO: LiNbO3 crystal to generate terahertz-wave which is sent out by the silicon prism array. Frequency tuning output of terahertz-wave is realized by rotating the output mirror without needing integrally rotating the resonant cavity. The oscillator is a continuously tunable full-solid state terahertz-wave coherent radiation source with small volume, compact structure, and high working stability and can be widely applied to terahertz-wave photoelectronic technique fields such as medical diagnosis, fine spectral analysis, biomedical Imaging, terahertz-wave communication, etc.

Description

technical field [0001] The invention relates to the technical field of terahertz wave optoelectronics, in particular to a terahertz wave parametric oscillator. Background technique [0002] Terahertz waves refer to electromagnetic waves with frequencies in the range of 0.1-10THz (1THz=10 12 Hz), its wave band is between millimeter wave and far infrared light in the electromagnetic spectrum. The terahertz wave frequency band is an electromagnetic radiation area that has great scientific research value but has not yet been fully researched and developed. Since the emission, reflection and transmission spectra of matter in the terahertz wave band contain rich physical and chemical information, and terahertz wave radiation has the characteristics of low energy and high penetration, it is widely used in physics, chemistry, astronomy, life, etc. Basic research fields such as science and medical science, as well as applied research fields such as safety inspection, medical imagin...

AI Technical Summary

Problems solved by technology

Although the flat-flat cavity type terahertz wave parametric oscillator has the advantages of simple and intuitive structure, large oscillating optical mode volume, and relatively easy to obtain single-mode oscillation, but the flat-flat cavity type is not suitable for the terahertz wave parametric oscillator. For the non-collinear parametric oscillation process, the adjustment accuracy is extremely high. When the terahertz wave tuning output is realized by mechanically rotating the platform on which the resonant cavity is placed, the resonant cavity is easily affected by external factors such as vibration, shock or temperature mutation. The harsh parallelism of the resonant cavity seriously affects the stability of the terahertz wave parametric oscillator, which limits its practical application

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