Frequency tuning method for TeraHertz parameter oscillator

Abstract

The invention provides a frequency tuning method for a TeraHertz parameter oscillator, which can realize high precision continuous tuning output of coherent narrow band TeraHertz by continuously changing pumping wavelength of the TeraHertz parameter oscillator without changing the incident angle of the pumping light. The invention has high frequency tuning precision (in particular in the long wavelength part), can overcome the change of characteristic of TeraHertz parameter oscillator caused by the change in the action area of the triple waves, can obviously expand frequency tuning scope of the TeraHertz parameter oscillator together with the angle tuning technology, and is hopeful to reach the low frequency area far smaller than 1THz which is hard to reach by singly using the angle tuning technology. Based on the tuning technology, the TeraHertz parameter oscillator can be widely used in TeraHertz optoelectronic technical fields such as medical diagnosis, fine spectrum analysis, bio-medical imaging, TeraHertz communication and the like.

Description

technical field [0001] The invention relates to the field of terahertz wave parametric oscillators, in particular to a frequency tuning method for terahertz wave parametric oscillators. 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. This 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 imag...

AI Technical Summary

Problems solved by technology

[0006] 2. Although the low-frequency terahertz wave can be obtained by reducing the angle between the pump light and the TPO cavity axis, a small angle will cause the spatial distribution of the pump light and the generated Stokes light to be too tight in the long distance of the limited cavity. Not only is it not conducive to tuning towards the low frequency of terahertz, but it also increases the possibility of pump light reflected from the TPO output mirror to the terahertz wave silicon coupling prism, which will excite a large number of free electrons on the silicon coupling prism, thereby Seriously affect the effective coupling output of terahertz waves;

[0007] 3. The incident angle of the pump light is changed mechanically, so that the tuning accuracy of this technology still needs to be improved

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