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Fast-frame single-shot pump-probe spectroscopy with chirped-fiber Bragg gratings

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Abstract

To acquire single-shot pump-probe waveforms for each laser pulse at a high repetition rate and high signal-to-noise ratio, we combined the photonic time-stretch technique and time-encoding method using a chirped-fiber Bragg grating (CFBG) and a grating-pair pulse compressor. By changing the pre-chirping of the probe pulse, a variable time window of the pump-probe traces from 1.4 to 17 ps was demonstrated. The use of a CFBG improved the signal-to-noise ratio of the waveforms by minimizing the loss of probe pulses due to the transmission through a long fiber. These techniques are promising, for example, in applications in multi-timescale pump-probe spectroscopy of irreversible phenomena.

© 2018 Optical Society of America

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Supplementary Material (1)

NameDescription
Visualization 1       Fast-frame acquisition of transient transmission changes in ZnTe. The delay stage of the pump pulse was moved by 4 mm in 1 s to rapidly change the pump-probe delay time. The pulse duration of probe pulse at the sample was 17 ps.

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