Abstract
An IR injection-seeded optical parametric oscillator (OPO) with narrow bandwidth ( Г ⩽0.25 cm −1 ) and high energy E ⩾ 4 mJ/pulse) output between 2.5 and 4 μm has been developed for cluster spectroscopy in molecular beams. The oscillator contains a LiNbO 3 crystal and is pumped by the 1.064 μm fundamental of a Q-switched Nd:YAG laser. The IR seed radiation is obtained by difference frequency mixing the output of a tunable dye laser with the second harmonic of the same Nd:YAG laser in a LiIO 3 crystal. After characterization, the OPO has been used to measure absorption spectra of small hydrogen-bonded clusters (HF) n and (H 2 O) n where n ranges from 2 to 8. The various spectral features could be assigned to specific cluster sized by dispersing the cluster beam with a secondary rare gas beam and by measuring the laser-induced depletion as a function of the scattering angle.
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