Terahertz wave parametric oscillator based on cascading parameter effect

Abstract

The invention discloses a terahertz wave parametric oscillator based on the cascading parameter effect. After pump light emitted from a pumping source is subjected to bean shrink through a telescope beam shrink system, the pump light enters a MgO:LiNbO3 crystal after passing a reflector and a light beam scanner and is totally reflected in the MgO:LiNbO3 crystal; the pump light generates first-order Stokes light and terahertz waves in the MgO:LiNbO3 crystal through the optical parameter effect, the wave vector of the terahertz waves is perpendicular to the exit face of the MgO:LiNbO3 crystal, and the terahertz waves directly exit from the MgO:LiNbO3 crystal; the cascading parameter process can occur all the time, all orders of Stokes light have respective resonant cavities, the specific area of the side face of the MgO:LiNbO3 crystal is plated with an all-order Stokes light total reflecting film, and the terahertz waves are continuously amplified in the cascading parameter process. The wave vector of the pump light and the wave vector of all orders of Stokes light are both perpendicular to the exit face of the MgO:LiNbO3 crystal, the losses of the pump light and all orders of Stokes light are effectively reduced, the incident angle of the pump light is changed by changing the direction of the light beam scanner, therefore, the included angle between the pump light and the axis of the first-order stokes light resonant cavity is changed, frequency tuning output of the terahertz waves can be achieved, and operation is flexible.

Description

technical field [0001] The invention belongs to the technical field of terahertz wave optoelectronics, and in particular relates to a terahertz wave parametric oscillator based on a cascaded parametric effect. Background technique [0002] Terahertz (Terahertz, referred to as THz, 1THz=10 12 Hz) waves refer to electromagnetic waves with a frequency in the range of 0.1-10THz, and its wave band is between millimeter waves and infrared waves. The special position of terahertz wave in the electromagnetic spectrum determines that it has many unique properties: ① "fingerprint" characteristics, when terahertz wave interacts with matter, it contains rich physical and chemical information, and most molecules have characteristics in the terahertz wave band Spectral lines (such as vibration and rotational energy level transition lines of biological macromolecules); ②Low energy, terahertz photon energy is about one millionth of X-rays, and will not cause harmful ionization of biologica...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a terahertz wave parametric oscillator based on the cascaded parametric effect to solve the problems of low power, low efficiency, high cost and complex structure of existing terahertz generating devices

Images