Probing with randomly interleaved pulse train bridges the gap between ultrafast pump-probe and nanosecond flash photolysis
Probing with randomly interleaved pulse train bridges the gap between ultrafast pump-probe and nanosecond flash photolysis
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DOI：
10.1364/ol.41.001498
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发表时间：
2016-04-01
期刊：
影响因子：
3.6
通讯作者：
Katoh, Ryuzi
中科院分区：
文献类型：
--
作者：
Nakagawa, Tatsuo;Okamoto, Kido;Katoh, Ryuzi
尽管瞬态吸收（TA）光谱的重要性由来已久，但许多研究人员仍然对在宽光谱范围内测量纳秒范围的困难感到沮丧。为了解决这个缺点，我们提出了一个TA分光光度计，其中有没有一个泵脉冲和一个多个探测脉冲从皮秒超连续谱光源，称为随机交错脉冲序列（RIPT）方法的火车之间的同步。对于每个泵浦脉冲，许多单色化的探测脉冲撞击样品，并且相关的泵浦-探测时间延迟以亚纳秒的精度被被动地逐个确定。通过重复泵浦自动变化的时间延迟，TA的时间分布，涵盖了从亚纳秒到毫秒的宽动态范围，同时获得。通过扫描波长，这个单一的，简单的装置不仅获得宽的时间范围TA轮廓，而且从可见光到近红外区域的宽带TA光谱。此外，我们提出了一个典型的结果，以证明如何RIPT方法可用于校正荧光，这往往污染TA曲线。(C)2016美国光学学会
Despite the long-standing importance of transient absorption (TA) spectroscopy, many researchers remain frustrated by the difficulty of measuring the nanosecond range in a wide spectral range. To address this shortcoming, we propose a TA spectrophotometer in which there is no synchronization between a pump pulse and a train of multiple probe pulses from a picosecond supercontinuum light source, termed the randomly-interleaved-pulse-train (RIPT) method. For each pump pulse, many monochromatized probe pulses impinge upon the sample, and the associated pump-probe time delays are determined passively shot by shot with subnanosecond accuracy. By repeatedly pumping with automatically varying time delays, a TA temporal profile that covers a wide dynamic range from subnanosecond to milliseconds is simultaneously obtained. By scanning wavelength, this single, simple apparatus acquires not only wide time range TA profiles, but also broadband TA spectra from the visible through the near-infrared regions. Furthermore, we present a typical result to demonstrate how the RIPT method may be used to correct for fluorescence, which often pollutes TA curves. (C) 2016 Optical Society of America