Ultrashort pulses, of the same time duration as the pump pulse, have been obtained with a traveling-wave parametric generator employing a temperature-tuned lithium triborate crystal in noncritical phase matching. Starting from a 190-fs pulse at 0.6 µm generated by a dye laser, we achieved an overall conversion efficiency of 10–15% in the tuning range 0.85–0.97 µm (and the corresponding range of 1.6–2.1 µm) with a pump energy of only 30 µJ. The easy operation in the femtosecond regime and the minimal energy requirements that we found are due to the small group-velocity mismatch of lithium triborate at this pump wavelength and to the absence of walk-off.

© 1993 Optical Society of America

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