Method for stabilizing output of optical pump gas THz laser based on opto-acoustic effect

Abstract

The invention relates to a method for stabilizing output of an optical pump gas THz laser based on an opto-acoustic effect and a frequency regulator for achieving the method, and belongs to the technical field of the THz laser. According to the method, an opto-acoustic detector is added on the basis of the THz laser; an opto-acoustic signal generated by operation material absorbing pumping lasers is detected by the added opto-acoustic detector; according to opto-acoustic signal changing conditions, a computer feedback control system is used for controlling a pump laser and piezoelectric ceramics arranged in a cavity of the THz laser, a pump laser source and the cavity length of the resonant cavity of the THz laser are convenient to adjust, the laser outputting stabilization of the pump laser source is achieved, and therefore the power outputting stabilization and the frequency outputting stabilization of the THz laser are achieved. By means of the method and system, the accuracy of frequency stabilization of outputting power and frequency can be higher, the responding speed can be higher, and the method and system are suitable for an optical pump gas THz laser system particularly.

Description

Technical field: [0001] The invention belongs to the technical field of terahertz (THz) lasers, and in particular relates to a method for stabilizing the output power and frequency of an optically pumped gas THz laser based on the gas photoacoustic effect and a frequency stabilization device thereof. Background technique: [0002] Terahertz wave refers to electromagnetic radiation (1THz-1012GHz) with a frequency of 100GHz--10THz, because terahertz is in a special position in the electromagnetic wave band, and has many unique properties compared with electromagnetic waves in other bands, such as instantaneousness and low energy. , broadband, strong penetrating power of non-polar substances, etc. THz waves are currently widely used in the field of biomedicine, national defense and military communications, and non-destructive testing for security inspections. The research in the past ten years has shown that it has very important academic and application value, so that countrie...

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Problems solved by technology

Wherein, the Lamb sag frequency stabilization method utilizes the hole-burning effect of non-uniform widening of the linear gain curve, and uses the central frequency of the gain curve as a reference standard frequency to realize frequency stabilization; although the frequency stabilization device of this method is relatively simple, However, there are certain limitations in the application, and the frequency reproducibility is poor

The phase-modulated optical heterodyne frequency stabilization method utilizes the resonant frequency of an optical resonant cavity as a reference frequency, but its structure is complex, and the Fabry-Perot (F-P) cavity is easily affected by the outside; thus its application is also restricted

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