A highly integrated ultra-high resolution mid-infrared dual-comb spectral measurement device and method

Abstract

The invention relates to a highly integrated ultra-high resolution mid-infrared dual-comb spectral measurement device and method, which solves the problems of complex structure, limited measurement speed and resolution, etc. faced by traditional mid-infrared spectral measurement systems. The system includes a pump unit, a microcavity unit, a modulation unit, a beam splitter unit, a test unit, a signal detection unit, a power balance unit, a reference detection unit and a spectrum analysis unit. The method includes: adjusting the pump unit to emit laser light to the microcavity unit; adjusting the modulation unit to perform dual-frequency modulation; the microcavity unit generates two sets of mid-infrared optical frequency combs with different repetition frequencies, which are equally divided by the beam splitting unit into test light and Reference light; after the test light is absorbed by the sample to be tested, it is photoelectrically converted by the signal detection unit and injected into the spectrum analysis unit; after the intensity of the reference light is adjusted, it is photoelectrically converted by the reference detection unit and injected into the spectrum analysis unit; Fourier transform and data processing to obtain the absorption spectrum of the sample to be tested.

Description

technical field [0001] The invention relates to a mid-infrared dual-comb spectrum measuring device and method, in particular to a highly integrated and ultra-high-resolution mid-infrared dual-comb spectrum measuring device and method. Background technique [0002] The optical frequency comb (optical frequency comb, optical comb) is an ultrashort pulse sequence at equal intervals in the time domain, and a series of extremely narrow spectral lines neatly distributed in the frequency domain. It is a natural and precise "reticle" for spectral analysis. Its unique advantages of wide range and narrow line width are especially suitable for analyzing and measuring the characteristic absorption spectrum "fingerprint" information of molecules. The dual optical comb spectrometer uses two optical frequency combs with slightly different repetition frequencies (repetition frequency) as interference light sources. The measurement stability is greatly improved, and the spectral resolution ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a highly integrated ultra-high resolution mid-infrared dual-comb spectral measurement device and method to solve the problem of traditional dual-comb spectral measurement systems with large volume, complex structure, limited resolution and measurement speed and the problem of dual microcavity. The dependence of the optical comb measurement system on the performance of the frequency-sweeping light source, the cumbersome tuning process, and the complex structure have achieved high integration, ultra-high resolution, fast measurement speed, and a simple tuning process. Frontiers in the field of analysis provide key research tools and bring a series of practical applications, which have important research significance and extensive practical value

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