Atmospheric absorption spectral measurement system based on time-resolved optical frequency comb, and method

Abstract

The invention discloses an atmospheric absorption spectral measurement system based on a time-resolved optical frequency comb, and a method. According to the atmospheric absorption spectral measurement system, firstly, the time-resolved variable optical frequency comb is generated, then subjected to laser power amplification and nonlinear transformation, and finally applied to gas absorption spectral measurement. Specifically, the time-resolved optical frequency comb is generated through a frequency shift loop and an optical fiber delay line firstly to serve as probe light, the output opticalfrequency comb is linear polarization pulse light, and thus power amplification and frequency nonlinear transformation are facilitated. According to the atmospheric absorption spectral measurement system based on the time-resolved optical frequency comb, and the method, the optical frequency comb can directly probe a precise gas spectrum on the time domain, system parameters can be conveniently adjusted, thus the system is applied to different atmospheric spectral measurement, and then the parameters of concentration, temperature, pressure intensity and the like on a corresponding gas integralpath can further be obtained through inversion.

Description

technical field [0001] The invention relates to an atmospheric spectrum measurement technique and an optical frequency comb generation technique, in particular to an atmospheric absorption spectrum measurement system and method based on a time-resolved optical frequency comb. Background technique [0002] The optical frequency comb can generate laser output with equally spaced frequencies, and its high spectral resolution makes it an important application in the field of gas detection. However, existing optical frequency combs all operate under mode-locked or continuous conditions, and the comb teeth are all generated simultaneously, which makes the comb teeth indistinguishable in the time domain. In order to distinguish comb teeth, one method is to introduce highly dispersive elements or fine wavelength tuning devices in the receiver, such as virtual imaging phased arrays, scanning F-P cavities and high-resolution interferometers, to achieve comb teeth resolution in the spe...

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Problems solved by technology

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a system and method for measuring atmospheric absorption spectrum based on a time-resolved optical frequency comb, which solves the problem that the teeth of the existing optical frequency comb are directly generated simultaneously without time resolution and spectral resolution. For problems that are not high and the results require complex calculations, optical frequency combs with different parameters can be generated through simple system settings, and then the frequency domain range can be adjusted through laser nonlinear transformation, so that optical frequency combs can be applied to atmospheric spectral measurements, and can be used in Direct display of gas absorption spectrum in time domain

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