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

A terahertz radiation source and radiation source technology, applied in the field of nonlinear optical frequency conversion, can solve the problems of restricting practical application, limiting tuning range and output stability, etc., to overcome the limited tuning range, improve stability, and improve utilization efficiency Effect

Active Publication Date: 2012-03-21
TIANJIN UNIV
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Problems solved by technology

However, this tuning method limits the tuning range and output stability, and restricts it

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

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Embodiment Construction

[0023] A tunable terahertz radiation source based on the difference-frequency Cherenkov effect, consisting of a laser, a frequency-doubling crystal, a dual-wavelength parametric oscillator and a difference-frequency crystal. The laser is a neodymium-doped yttrium aluminum garnet Nd:YAG Q-switched laser; the frequency-doubling crystal is a KTP crystal that is phase-matched in class II; a harmonic mirror is placed between the frequency-doubling crystal and the parametric oscillator; the dual-wavelength parametric oscillator is Class II phase-matched KTP crystal OPO; a polarization filter, a beam combiner and a cylindrical lens are arranged between the parametric oscillator and the difference frequency crystal; the difference frequency crystal is magnesium oxide doped lithium niobate (MgO:LiNbO 3 or MgO:LN) crystal, the generated THz wave is coupled out by the Si prism on the side of the crystal.

[0024] The neodymium-doped yttrium aluminum garnet Nd:YAG Q-switched laser is comp...

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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 ...

Claims

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Application Information

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IPC IPC(8): H01S1/02G02F1/355G02F1/35
CPCG02F2203/13G02F2001/374G02F1/3534G02F1/374
Inventor 王与烨徐德刚刘鹏翔吕达姚建铨
Owner TIANJIN UNIV
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