Abstract
Coaxial time-resolved spectroscopy (TRS) based on a pump–probe technique using a color-selective double pulse (CSDP) is proposed. The CSDP, generated using an optical pulse shaper (OPS), was composed of different spectral components. Coaxially propagating CSDPs were used for pump and weak probe pulses. As a proof of concept, we evaluated the transient absorption of a ZnTe crystal from the difference between the temporal waveforms of the output chirped probe pulse with and without pump pulse using the OPS. Upon changing the pulse width of the probe pulse, the measured temporal width of the reaction was 0.2 ps, which agreed with that measured via conventional TRS.
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