Dual-wavelength narrow-linewidth terahertz wave parametric oscillator

Abstract

The invention discloses a dual-wavelength narrow-linewidth terahertz wave parametric oscillator. The resonant cavity comprises a right angle prism, a 45-degree total reflective mirror, a dual-blazing-angle grating, a first planar total reflective mirror and a second planar total reflective mirror; an MgO:LiNbO<3> crystals are put in the resonant cavity, and a silicon prism array apparatus is placed on the surface of the resonant cavity; pump light incidents to the resonant cavity, and an included angle of 1.5 degrees is formed between the pump light and the resonant cavity; the dual-blazing-angle grating refers to the dual-blazing-angle grating with crossed periods; the -1 level diffraction efficiency corresponding to one blazing angle is the maximum while the -2 level diffraction efficiency corresponding to the other blazing angle is the maximum; and the two diffraction efficiencies are approximately equal. By separately rotating the 45-degree total reflective mirror, the dual-blazing-angle grating, the first planar total reflective mirror and the second planar total reflective mirror, any dual-wavelength terahertz wave tuning output can be realized, and the dual wavelengths are not affected by each other. The dual-wavelength narrow-linewidth terahertz wave parametric oscillator can be widely applied to the field of the terahertz photo-electronic technique, such as terahertz wave radars, fine spectral analysis, medical imaging, terahertz communication and the like.

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

Images