Tunable laser frequency stabilizing device capable of reinforcing gas photoacoustic spectroscopy on basis of quartz tuning fork

Abstract

The invention relates to a tunable laser frequency stabilizing device capable of reinforcing the gas photoacoustic spectroscopy on the basis of a quartz tuning fork, which comprises a tunable laser, a modulation current source, a temperature controller, an optical fiber coupler, a closed gas chamber, the quartz tuning fork, a preamplifier, a phase sensitive detector and a control box, wherein the output end of the modulation current source is connected with the input end of the tunable laser; the output end of the temperature controller is connected with the input end of the tunable laser; the input end of the optical fiber coupler is connected with the output end of the tunable laser; an optical fiber focusing lens is arranged on one side wall of the closed gas chamber; the optical fiber focusing lens extends into the closed gas chamber; the quartz tuning fork is positioned in the closed gas chamber; the preamplifier is used for receiving a signal output by the quartz tuning fork; the input end of the phase sensitive detector is connected with the output end of the preamplifier; the input end of the control box is connected with the output end of the phase sensitive detector; and the modulation current source and the temperature controller are controlled by two output ends of the control box. The invention can solve the problems of high background noise, large size, poor structural stability and the like in a conventional gas adsorption spectrum frequency stabilizing technology adopting a direct adsorption method.

Description

technical field [0001] The invention belongs to the technical field of laser light source frequency stabilization, and in particular relates to a tunable laser frequency stabilization device based on a quartz tuning fork to enhance gas photoacoustic spectrum. Background technique [0002] High stability, narrow linewidth, and wavelength tunable lasers have very important applications in the fields of ultra-fine spectral detection, metrology, coherent optical communication, dense wavelength division multiplexing, and quantum frequency standards. Affected by factors such as injection current and operating temperature, free-running tunable lasers have long-term spectrum broadening and drifting up to hundreds of MHz or even several GHz. For the above applications, active frequency stabilization measures must be taken. At present, the relatively mature method is the laser frequency stabilization based on the direct absorption method of gas absorption spectrum, that is, let the la...

AI Technical Summary

Problems solved by technology

It can solve the problems of strong background noise, large volume and poor structural stability in the traditional direct absorption gas absorption spectrum frequency stabilization technology

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