Research progress of double femtosecond laser frequency comb spectroscopy measurement technology

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. According to the principle of dual-comb spectroscopy and taken the number of pump light sources used as the classification criteria, the principles of multiple dual-comb spectroscopy techniques are briefly introduced basen on different implementation schemes at home and abroad in recent years, the various experimental schemes were described proposed by different experimental groups with different numbers of pump light sources, and the results of their spectral experiments were introduced. With the deepening of research, reducing the number of pump light sources used is one of the important directions for the development of dual-comb spectrometers to achieve miniaturization of equipment, and the increase is an important development idea from one-dimensional to multi-dimensional. The classic dual light source configuration has made important progress in accuracy and two-dimensionalization.