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首页> 外文会议>International symposium on photoelectronic detection and imaging;ISPDI 2011 >Realtime correction of probe pulse in subpicosecond time-resolved transient absorption spectroscopy
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Realtime correction of probe pulse in subpicosecond time-resolved transient absorption spectroscopy

机译：亚皮秒时间分辨瞬态吸收光谱法中探针脉冲的实时校正

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摘要

Due to its breakthrough the electro-optical time response limitation for picosecond dynamics of processes, many research groups around the world operating in different fields from physics and chemistry to biology, medicine and material science, utilize laser setups capable of providing subpicosecond pulses and femtosecond-level time delay lines. However the signal amount of Femto-picosecond Dynamics is about at an altitude of 1%, but the fluctuation of femtosecond probe pulse at its best can only reach about 5%. Real-time correct the probe pulse is the only effective way to realize subpicosecond time-resolved detection precision of transient absorption spectroscopy. So in this paper, reference pulse was drawn into the measurement equipment through different methods to dispel the fluctuation of probe pulse. Firstly, in the case of Subpicosecond time-resolved transient absorption spectroscopy, probe and reference beams have the same spectral distribution and derived from the same source to measure the variation of transmittance in the excited volume. Secondly probe pulse is spatially and temporally overlapped to the excitation pulse, reference pulse spatially overlapped but temporally anticipated in respect to the excitation pulse. Finally reference pulse passes through the sample in a different position. The detector can be a CCD camera or a double photodiode. The results shown that when reference pulse passes through the sample in a different position and detected by CCD, the correction results can reach to 1%. Which meet the femto-picosecond dynamics precise requirement.
机译：由于突破了皮秒动力学过程的电光时间响应限制，世界各地许多研究小组在从物理和化学到生物学，医学和材料科学的不同领域开展工作，利用能够提供亚皮秒脉冲和飞秒脉冲的激光装置。电平延时线。但是，飞秒动态的信号量大约在1％的高度，但是飞秒探测脉冲的最大波动只能达到5％。实时校正探测脉冲是实现瞬态吸收光谱法亚皮秒时间分辨检测精度的唯一有效方法。因此，本文通过不同的方法将参考脉冲引入测量设备中，以消除探测脉冲的波动。首先，在亚皮秒时间分辨的瞬态吸收光谱法中，探测光束和参考光束具有相同的光谱分布，并且源自同一光源，以测量激发体积中的透射率变化。其次，探测脉冲在空间和时间上与激发脉冲重叠，参考脉冲在空间上重叠，但是相对于激发脉冲在时间上是预期的。最后，参考脉冲在不同位置通过样品。检测器可以是CCD摄像机或双光电二极管。结果表明，当参考脉冲在不同位置通过样品并被CCD检测时，校正结果可以达到1％。从而满足飞秒皮秒动力学的精确要求。

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