学術雑誌論文 High-Acquisition-Rate Single-Shot Pump-Probe measurements using Time-Stretching method

Katayama, Ikufumi  ,  Johnson, Jeremy A.  ,  Takeda, Jun  ,  Ellsworth, Nicholas R.  ,  Salmans, Parker D.  ,  Johnson, Courtney L.  ,  Minami, Yasuo  ,  Kobayashi, Masataka

6 ( 37614 ) 2016-11-23
内容記述
Recent advances of ultrafast spectroscopy allow the capture of an entire ultrafast signal waveform in asingle probe shot, which greatly reduces the measurement time and opens the door for the spectroscopyof unrepeatable phenomena. However, most single-shot detection schemes rely on two-dimensionaldetectors, which limit the repetition rate of the measurement and can hinder real-time visualizationand manipulation of signal waveforms. Here, we demonstrate a new method to circumvent thesedifficulties and to greatly simplify the detection setup by using a long, single-mode optical fiber and a fastphotodiode. Initially, a probe pulse is linearly chirped (the optical frequency varies linearly across the pulsein time), and the temporal profile of an ultrafast signal is then encoded in the probe spectrum. The probepulse and encoded temporal dynamics are further chirped to nanosecond time scales using the dispersionin the optical fiber, thus, slowing down the ultrafast signal to time scales easily recorded with fastdetectors and high-bandwidth electronics. We apply this method to three distinct ultrafast experiments:investigating the power dependence of the Kerr signal in LiNbO3, observing an irreversible transmissionchange of a phase change material, and capturing terahertz waveforms.
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