Mechanism analysis and control design of selective excitation of adjacent energy levels

Abstract

Femtosecond coherent anti-Stokes Raman scattering (CARS) generated by femtosecond laser with a large spectral range will inevitably face the problem that several adjacent vibration levels are excited simultaneously. In this paper, the internal control mechanism of open-loop coherent control methods is analyzed and summarized, and a design method forthe optimal control parameters to realize the selective excitation of adjacent energy levels is proposed. Finally, numerical simulations for selective excitation of adjacent energy levels are done to verify correctness and effectiveness of the method proposed, showing that the method proposed in this paper can optimize the ratio between the resonant peaks of two resonant energy levels to about 150–250.