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We studied the effects of cryogenic cooling of a 2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal on the generationof broadband THz pulses via collinear optical rectification of 1350 nmfemtosecond laser pulses. Cooling of the OH1 crystal from room temperature to10 K leads to a ~10% increase of the pump-to-THz energy conversion efficiencyand a shift of the THz pulse spectra to a higher frequency range. Both effectsare due the temperature variation of THz absorption and the refractive index ofthe OH1 crystal. This conclusion has been verified by temperature dependentmeasurements of the linear absorption in the THz frequency region.

Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K