In this paper, we systematically established a chirp modulation theoretical model for spectral focusing coherent anti‐Stokes Raman scattering technology (SF‐CARS). Through in‐depth analysis of the dispersion characteristics of fiber optic dispersion and grating pairs, the control mechanism of dispersion effect on the time frequency characteristics of laser pulses is elucidated, and the influence of laser pulse parameters on spectral resolution and signal‐to‐noise ratio (SNR) is revealed. Through theoretical optimization of precise chirp modulation, we improved the spectral resolution of the SF‐CARS system to 6.7 cm −1 and simultaneously enhanced the SNR to 340, achieving a concurrent improvement in both resolution and detection sensitivity. With the improvement of spectral resolution and SNR of SF‐CARS, its application boundaries for studying dynamic processes will be further expanded.
Li et al. (Thu,) studied this question.