Ultraviolet double-optical-comb absorption spectrum measurement device and method based on heterodyne detection

Abstract

The invention discloses an ultraviolet double-optical-comb absorption spectrum measurement device and method based on heterodyne detection. The device comprises two femtosecond mode-locked pulse lasers, two femtosecond laser pulse amplifiers, two femtosecond laser pulse time-frequency domain control systems, two nonlinear spectrum conversion systems and a sample measurement and analysis system. Femtosecond lasers outputted by the two femtosecond mode-locked pulse lasers are amplified by the two femtosecond laser pulse amplifiers and inputted into the two femtosecond laser pulse time-frequencydomain control systems. Two paths of optical combs with the same wave band and coherent phases are outputted, the two paths of optical combs are respectively inputted into the two nonlinear spectrum conversion systems so as to expand the wave bands of the two paths of optical combs to ultraviolet light, the two paths of output ultraviolet light combs are inputted into the sample measurement and analysis system, and a double-optical-comb absorption spectrum of sample molecules in the ultraviolet wave band is generated. The device has the advantages of being simple in structure, good in stability, extremely high in resolution ratio, high in precision, high in measurement speed, capable of achieving real-time monitoring and high in sensitivity.

Description

technical field [0001] The invention belongs to the technical field of ultrafast optics and optical frequency combs, and in particular relates to a device and method for measuring ultraviolet double-comb absorption spectra based on heterodyne detection. Background technique [0002] Ultra-high-precision precision spectroscopy is the basis for the research of many basic scientific issues and the development of cutting-edge new technologies. At present, the measurement of high-precision physical constants is mostly obtained by directly or indirectly measuring spectral transition lines. Narrow linewidth laser sources are used as excitation sources in precision spectroscopy. Because the gain material in the high-performance ultraviolet band is very rare, the output wavelength of common narrow-linewidth semiconductor continuous lasers is limited to the near-infrared and visible bands. The use of narrow-linewidth lasers in the ultraviolet band can greatly improve the measurement...

AI Technical Summary

Problems solved by technology

However, the high-precision spectral measurement technology based on ultraviolet light combs is not very mature. Traditional excitation spectrum and pump detection techniques are generally used, which do not fully utilize the time-frequency domain advantages of ultraviolet light comb light sources, and the measurement accuracy and accuracy are also low. not tall

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