量子电子学报, 2008, 25 (3): 0282, 网络出版: 2010-06-07
甲醇溶液相干反斯托克斯拉曼光谱(CARS)的选择激发
Selective excitation of coherent anti-Stokes Raman scattering from methanol solution
量子相干控制 选择激发 自适应脉冲整形 相干反斯托克斯拉曼散射 遗传算法 quantum coherent control selective excitation adaptive femtosecond pulse shaping coherent anti-Stokes Raman scattering genetic algorithm
摘要
利用飞秒自适应脉冲整形相干控制技术成功实现了甲醇溶液中甲基对称(νs(CH3)2832cm－1)和反对称(νAs(CH3)2948 cm－1)振动能级相干反斯托克斯拉曼光谱(CARS)的选择激发。为了进一步探究双光束飞秒CARS光谱实现选择激发的机制，采用二次谐波频率分辨光学开关(SHG－FROG)测量方法对整形前后的泵浦激光脉冲进行了探测。SHG－FROG痕迹结果显示裁剪泵浦光中的有效频段可实现飞秒CARS的选择激发。研究表明飞秒自适应脉冲整形相干控制技术对于复杂分子系统飞秒CARS的选择激发研究具有非常重要的科学意义。
Abstract
The selective excitation of coherent anti-Stokes Raman scattering(CARS)to the νs(CH3)(2832 cm-1)and the νAS(CH3)(2948 cm-1 )vibrational modes from methanol solution is successfully achieved by adaptive femtosecond pulse shaping coherent control technology. In order to explore the mechanism of mode-selective excitation from two-pulse femtosecond CARS spectrum,second harmonic generation frequency-resolved optical gating(SHG-FROG)method is used to measure the original and optimal pump pulses. SHG-FROG traces indicate that the mode-selective excitation of femtosecond CARS spectrum can be achieved by manipulating the effective frequency components of the pump pulse related to specific molecular vibrational mode. The experimental results demonstrate that adaptive femtosecond pulse shaping coherent control technology has scientific significance for the complicated molecular systems.
李霞, 张晖, 张诗按, 张向韵, 陈果良, 王祖赓, 孙真荣. 甲醇溶液相干反斯托克斯拉曼光谱(CARS)的选择激发[J]. 量子电子学报, 2008, 25(3): 0282. LI Xia, ZHANG Hui, ZHANG Shi-an, ZHANG Xiang-yun, CHEN Guo-Bang, WANG Zu-geng, SUN Zhen-rong. Selective excitation of coherent anti-Stokes Raman scattering from methanol solution[J]. Chinese Journal of Quantum Electronics, 2008, 25(3): 0282.
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