With the advantages of high resolution, high sensitivity, wide spectral coverage and rapid measurement, the dual-comb spectroscopy technology has developed rapidly in the field of molecular and atomic spectroscopy. This article firstly uses various methods such as balanced optical cross-correlation method and beat frequency with ultra-stable laser to measure the phase noise of the dual optical comb system for different optical comb locking schemes. Then the absorption spectra of C2H2 were measured for the dual comb system under different locking schemes. The phase noise obtained under different locking schemes is compared, and the C2H2 absorption spectrum under each scheme is calculated at the same time, so as to obtain the influence of phase noise on the spectral resolution in the dual-comb spectrum measurement.
In the past decade, the research on optical frequency comb and its applications has achieved rapid development, bringing revolutionary progress to the metrology field. Frequency stabilization and absolute frequency measurement of the CW laser through optical frequency combs is very important for establishing new length standards. A tunable near-infrared CW laser is phase locked to a commercial optical frequency comb referring to a Rubidium atomic clock for frequency stabilization. A home-made comb is phase locked to a hydrogen maser for measuring the absolute frequency of the frequency stabilized CW laser obtained. The procedure of frequency stabilization and absolute frequency measurement based on optical frequency combs is demonstrated and the uncertainty and stability of the frequency stabilized CW laser are estimated.
In frequency-modulated continuous-wave (FMCW) ladar, researchers usually linearize the output of the ladar’s tunable laser by a reference interferometer for high-accuracy measurement, but the reference interferometer need to be precisely calibrated. The H13C14N cell is a universal tool to complete the calibration. Here, we use the optical frequency comb instead of the traditional HCN gas cell to calibrate the path-length difference of the reference interferometer for higher precision. In this article, we present a detailed introduction of the experiment for path-length difference measurement and data processing method. The finally experimental results show that this method can give a micron precision, the standard deviation is 2.560e-5.
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