Abstract

An infrared pump-probe setup using rapid polarization modulation has been developed to perform time-resolved vibrational anisotropy measurements. A photo-elastic modulator is used as a rapidly switchable half-wave plate, enabling the measurement of transient absorptions for parallel and perpendicular polarizations of the pump and probe pulses on a shot-to-shot basis. In this way, infrared intensity fluctuations are nearly completely canceled, significantly enhancing the accuracy of the transient-anisotropy measurement. The method is tested on the OD-stretch vibration of HDO in ${\mathrm{H}}_2\mathrm{O}$, for which the signal-to-noise ratio is found to be 4 times better than with conventional methods.

© 2015 Optical Society of America

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