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Development of a highly stable picosecond time-resolved Raman spectrometer near Fourier-transform limit with a femtosecond light source
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-08-19 , DOI: 10.1002/jrs.6232 Tsukasa Tokita 1 , Tomohisa Takaya 2 , Koichi Iwata 1
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-08-19 , DOI: 10.1002/jrs.6232 Tsukasa Tokita 1 , Tomohisa Takaya 2 , Koichi Iwata 1
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Picosecond time-resolved Raman spectroscopy is an experimental method effective for studying the structure and dynamics of short-lived transient species. Spectral resolution of less than 10 cm−1 and high stability of the laser light source are both critically important for extracting detailed information on the structure and dynamics of the transient species from the observed picosecond time-resolved Raman spectra. However, it is often technically challenging to obtain stable picosecond pulses that have a spectral width of 10 cm−1 or smaller, which is only achieved if the time-energy product of a light pulse is close to the Fourier-transform limit, from a picosecond light source. We present a new scheme for a picosecond time-resolved Raman spectrometer with a stable femtosecond laser as its light source. Femtosecond light pulses from the laser are successfully converted to stable picosecond light pulses with a volume-grating notch filter. The spectral and temporal widths of the prepared picosecond pulse are 6.0 cm−1 and 3.2 ps, respectively, close to the Gaussian Fourier-transform limit. The vibrational cooling dynamics of S1 trans-stilbene prepared with the photoexcitation at 316 and 266 nm has been observed with the newly developed picosecond time-resolved Raman spectrometer, demonstrating a high capability of the proposed method.
中文翻译：
使用飞秒光源开发接近傅立叶变换极限的高度稳定皮秒时间分辨拉曼光谱仪
皮秒时间分辨拉曼光谱是一种有效研究短寿命瞬态物质的结构和动力学的实验方法。小于 10 cm -1 的光谱分辨率和激光光源的高稳定性对于从观察到的皮秒时间分辨拉曼光谱中提取关于瞬态物质的结构和动力学的详细信息都至关重要。然而，获得光谱宽度为 10 cm -1 的稳定皮秒脉冲通常在技术上具有挑战性或者更小，这只有在来自皮秒光源的光脉冲的时间能量积接近傅立叶变换极限时才能实现。我们提出了一种以稳定的飞秒激光器作为光源的皮秒时间分辨拉曼光谱仪的新方案。来自激光器的飞秒光脉冲通过体积光栅陷波滤波器成功转换为稳定的皮秒光脉冲。制备的皮秒脉冲的光谱和时间宽度分别为 6.0 cm -1和 3.2 ps，接近高斯傅立叶变换极限。S 1 trans的振动冷却动力学用新开发的皮秒时间分辨拉曼光谱仪观察到了在 316 和 266 nm 光激发制备的二苯乙烯，证明了所提出方法的高性能。
更新日期：2021-08-19
中文翻译：
使用飞秒光源开发接近傅立叶变换极限的高度稳定皮秒时间分辨拉曼光谱仪
皮秒时间分辨拉曼光谱是一种有效研究短寿命瞬态物质的结构和动力学的实验方法。小于 10 cm -1 的光谱分辨率和激光光源的高稳定性对于从观察到的皮秒时间分辨拉曼光谱中提取关于瞬态物质的结构和动力学的详细信息都至关重要。然而，获得光谱宽度为 10 cm -1 的稳定皮秒脉冲通常在技术上具有挑战性或者更小，这只有在来自皮秒光源的光脉冲的时间能量积接近傅立叶变换极限时才能实现。我们提出了一种以稳定的飞秒激光器作为光源的皮秒时间分辨拉曼光谱仪的新方案。来自激光器的飞秒光脉冲通过体积光栅陷波滤波器成功转换为稳定的皮秒光脉冲。制备的皮秒脉冲的光谱和时间宽度分别为 6.0 cm -1和 3.2 ps，接近高斯傅立叶变换极限。S 1 trans的振动冷却动力学用新开发的皮秒时间分辨拉曼光谱仪观察到了在 316 和 266 nm 光激发制备的二苯乙烯，证明了所提出方法的高性能。
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