Tunable terahertz radiation source based on difference frequency cherenkov effect and modulation method

Abstract

The invention relates to the non linear optical frequency conversion. To realize output of high power THz wave which can be continuously tuned, and stable running at room temperature, the technical scheme used by the invention is that: a tunable terahertz radiation source based on difference frequency cherenkov effect is composed of a laser device, a frequency doubling crystal, a double wavelength parametric oscillator, a harmonic mirror, a polarization filter, a combined beam mirror, a column lens and a difference frequency crystal; the harmonic mirror is placed between the frequency doubling crystal and the double wavelength parametric oscillator; the double wavelength parametric oscillator is II type phase matching KTP (Potassium Titanyl Phosphate) crystal OPO (Optical Parametric Oscillator); the polarization filter, the combined beam mirror and the column lens are arranged between the parametric oscillator and the difference frequency crystal; the difference frequency crystal is amagnesium oxide doped lithium niobate crystal with molecular formula of MgO:LiNbO3 or MgO:LN, and the generated THz wave is coupled and output by an Si prism on the side surface of the difference frequency crystal. The tunable terahertz radiation source based on difference frequency cherenkov effect is mainly applied to the optical frequency conversion.

Description

technical field [0001] The invention relates to nonlinear optical frequency conversion, in particular to realizing terahertz wave tuning output by using the optical Cherenkov effect in lithium niobate crystals, specifically, to a tunable terahertz radiation source and modulation method based on the difference frequency Cherenkov effect. Background technique [0002] Terahertz (Terahertz, referred to as THz, 1THz = 10 12 Hz) radiation source is the key core technology for the development of science and technology in the THz field. It refers to the frequency range from 100 GHz to 10 THz, the corresponding wavelength is from 3 mm to 30 microns, and the electromagnetic spectrum range is quite wide between millimeter wave and infrared light. . Due to its special position in the electromagnetic spectrum, it has a series of special properties. In particular, wide-tuned THz coherent radiation sources have a wide range of application values ​​in the fields of national and national ...

AI Technical Summary

Problems solved by technology

However, this tuning method limits the tuning range and output stability, and restricts its practical application in the field of scientific research and national defense security.

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