Gunaratne Tissa C, Milliken Matthew, Challa J Reddy, Simpson M Cather
Center for Chemical Dynamics, Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA.
Appl Opt. 2006 Jan 20;45(3):558-64. doi: 10.1364/ao.45.000558.
A tunable, ultrafast (approximately 100 fs-approximately 1 ps) laser system generating mid-IR (3-10 microm) and UV/visible (392-417 nm, 785-835 nm) radiation is described and its output characterized. The system is designed to explore vibrational dynamics in the condensed phase in a direct, two-pulse, time-resolved manner, using Raman spectroscopy as the probe. To produce vibrational resolution, probe pulses are spectrally narrowed by use of a long doubling crystal. Frequency-resolved optical gating is used to evaluate beam characteristics. An effective method for determining the temporal overlap of the pump and probe pulses for a one-color, 400 nm configuration is illustrated. Representative results from studies of heme and paranitroaniline vibrational dynamics illustrate the effectiveness of the visible pump-visible probe portion of the system in illuminating fast structure and energy dynamics.
描述了一种可调谐的超快（约100飞秒至约1皮秒）激光系统，该系统能产生中红外（3 - 10微米）以及紫外/可见光（392 - 417纳米，785 - 835纳米）辐射，并对其输出进行了表征。该系统旨在以直接的双脉冲时间分辨方式探索凝聚相中的振动动力学，使用拉曼光谱作为探针。为了实现振动分辨率，通过使用长倍频晶体对探测脉冲进行光谱窄化。采用频率分辨光学门控来评估光束特性。阐述了一种用于确定单色400纳米配置下泵浦脉冲和探测脉冲时间重叠的有效方法。对血红素和对硝基苯胺振动动力学研究的代表性结果表明，该系统的可见泵浦 - 可见探测部分在揭示快速结构和能量动力学方面是有效的。
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