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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Femtosecond-time-resolved highly selective molecular-vibration excitation using a novel vibrationally synchronized pumping technique with frequency difference resonance
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Femtosecond-time-resolved highly selective molecular-vibration excitation using a novel vibrationally synchronized pumping technique with frequency difference resonance

机译:飞秒时间分辨的高选择性分子振动激发,使用具有频差共振的新型振动同步泵浦技术

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摘要

Selective stimulated Raman scattering using a single-color femtosecond N-pulse train of finite pulse duration leads to a low excitation efficiency in the high frequency region. This low efficiency of Raman mode excitation is due to spectral modulation which stems from the finite duration of the pulses in each train. To overcome the low efficiency of excitation in the high frequency region, a vibrationally synchronized pumping technique with frequency difference resonance is proposed. In this technique, both the pulse-repetition rate and the center frequency difference of carrier-phase-locked two-color beams consisting of a femtosecond N-pulse train are chosen to be resonant with the frequency of a specific vibrational or rotational mode of interest. In addition, a formula describing the optimum pulse number N for efficient selective excitation is derived.
机译:使用具有有限脉冲持续时间的单色飞秒N脉冲序列的选择性受激拉曼散射会导致高频区域的激发效率较低。拉曼模式激发的这种低效率归因于频谱调制,频谱调制源于每个序列中脉冲的有限持续时间。为了克服高频区域的低激励效率,提出了一种具有频差共振的振动同步泵浦技术。在此技术中,选择由飞秒N脉冲序列组成的载波锁相双色光束的脉冲重复频率和中心频率差,以使其与特定的特定振动或旋转模式的频率共振。另外,导出描述用于有效的选择性激励的最佳脉冲数N的公式。

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