A dual-wavelength, narrow-linewidth terahertz wave parametric oscillator

Abstract

The invention discloses a terahertz wave parametric oscillator with dual wavelengths, narrow linewidth and high working stability. Its resonant cavity consists of a right-angle prism, a 45° total reflection mirror, a double blazed grating, a first plane total reflection mirror and a third plane total reflection mirror. It is composed of two plane total mirrors; the resonant cavity has a MgO:LiNbO3 crystal built in, and a silicon prism array device is placed on its surface; the pump light enters the resonant cavity and forms an angle of 1.5° with the cavity axis of the resonant cavity. The double blazed grating is a cross-period double blazed grating. One blaze angle corresponds to the highest ‑1 order diffraction efficiency, and the other blaze angle corresponds to the highest ‑2 order diffraction efficiency, and the diffraction efficiencies of the two are approximately equal. By rotating the 45° total reflection mirror, the double blazed grating, the first plane total reflection mirror and the second plane total reflection mirror, any dual-wavelength terahertz wave tunable output can be achieved, and the dual-wavelength output does not affect each other. It can be widely used in terahertz optoelectronic technology fields such as terahertz wave radar, fine spectrum analysis, biomedical imaging, and terahertz communication.

Description

technical field [0001] The invention relates to the technical field of terahertz wave optoelectronics, in particular to a dual-wavelength, narrow-linewidth terahertz wave parametric oscillator. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency in the range of 0.1 to 10 THz, and their wave band is between 30 μm and 3 mm, which is in the transition region between millimeter waves and infrared waves, electronics and photonics. Due to the characteristics of high penetration, low energy, high coherence, and fingerprint characteristics, terahertz waves are currently widely used in basic research fields such as biology, physics, chemistry, astronomy, and medical science, as well as biomedical imaging and live detection. , communication radar, national security and anti-terrorism and other applied technology research fields. The development of a terahertz wave radiation source with excellent performance is one of the main key technologies...

AI Technical Summary

Problems solved by technology

This common flat-flat cavity structure terahertz wave parametric oscillator has a relatively simple frequency tuning method, and generally can only generate a bunch of narrow-band, continuously tunable terahertz waves.

When the wavelength tuning output is realized by rotating the platform on which the resonant cavity is placed, the mechanical stability of the device is also poor, and the fine tuning of the terahertz wave wavelength needs to be further improved

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