A 100 kHz time-resolved multiple-probe femtosecond to second infrared absorption spectrometer

Greetham, Gregory M. and Donaldson, Paul M. and Nation, Charlie and Sazanovich, Igor V. and Clark, Ian P. and Shaw, Daniel J. and Parker, Anthony W. and Towrie, Michael (2016) A 100 kHz time-resolved multiple-probe femtosecond to second infrared absorption spectrometer. Applied Spectroscopy, 70 (4). pp. 645-653. ISSN 0003-7028

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    Abstract

    We present a dual-amplifier laser system for time-resolved multiple-probe infrared (IR) spectroscopy based on the ytterbium potassium gadolinium tungstate (Yb:KGW) laser medium. Comparisons are made between the ytterbium-based technology and titanium sapphire laser systems for time-resolved IR spectroscopy measurements. The 100 kHz probing system provides new capability in time-resolved multiple-probe experiments, as more information is obtained from samples in a single experiment through multiple-probing. This method uses the high repetition-rate probe pulses to repeatedly measure spectra at 10 μs intervals following excitation allowing extended timescales to be measured routinely along with ultrafast data. Results are presented showing the measurement of molecular dynamics over >10 orders of magnitude in timescale, out to 20 ms, with an experimental time response of