Experimental Investigation on Selective Excitation of Two-Pulse Coherent Anti-Stokes Raman Scattering
LI Xia, ZHANG Hui, ZHANG Xiang-Yun, ZHANG Shi-An, WANG Zu-Geng, SUN Zhen-Rong
State Key Laboratory of Precision Spectroscopy, and Department of Physics, and Department of Mathematics, East China Normal University, Shanghai 200062
Experimental Investigation on Selective Excitation of Two-Pulse Coherent Anti-Stokes Raman Scattering
LI Xia;ZHANG Hui;ZHANG Xiang-Yun;ZHANG Shi-An;WANG Zu-Geng, SUN Zhen-Rong
State Key Laboratory of Precision Spectroscopy, and Department of Physics, and Department of Mathematics, East China Normal University, Shanghai 200062
摘要Selective excitation of coherent anti-Stokes Raman scattering from the benzene solution is achieved by adaptive pulse shaping based on genetic algorithm, and second harmonic generation frequency-resolved optical gating (SHG-FROG) technique is adopted to characterize the original and optimal laser pulses. The mechanism for two-pulse coherent mode-selective excitation of Raman scattering is experimentally investigated by modulating the pump pulse in the frequency domain, and it is indicated that two-pulse coherent mode-selective excitation of Raman scattering mainly depends on the effective frequency components of the pump pulse related to specific vibrational mode. The experimental results suggest that two-pulse CARS has good signal-to-background ratio and high sensitivity, and it has attractive potential applications in the complicated molecular system.
Abstract：Selective excitation of coherent anti-Stokes Raman scattering from the benzene solution is achieved by adaptive pulse shaping based on genetic algorithm, and second harmonic generation frequency-resolved optical gating (SHG-FROG) technique is adopted to characterize the original and optimal laser pulses. The mechanism for two-pulse coherent mode-selective excitation of Raman scattering is experimentally investigated by modulating the pump pulse in the frequency domain, and it is indicated that two-pulse coherent mode-selective excitation of Raman scattering mainly depends on the effective frequency components of the pump pulse related to specific vibrational mode. The experimental results suggest that two-pulse CARS has good signal-to-background ratio and high sensitivity, and it has attractive potential applications in the complicated molecular system.
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2008, Vol. 25 
