A new concept 1 kHz repetition rate 1 ps time resolved resonance Raman apparatus based on optical parametric amplifiers (OPAs) has been developed. The two purpose built OPAs are pumped simultaneously by a titanium sapphire regenerative amplifier. Each OPA provides several microjoules of energy per pulse, is tunable from 470 to 2200 nm and the spectral bandwidth of the probe beam is maintained at about 20 across this tuning range by spectrally filtering the light pulse during the OPA process. Further wavelength coverage down to ultraviolet wavelengths is achieved by using frequency mixing of the OPA outputs with the regenerative amplifier. The potential this unique system has for obtaining the vibrational spectra of photoexcited transients is demonstrated by presenting some preliminary results obtained from several spectroscopy experiments.
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Towrie et al. (1998) studied this question.
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