, Volume 70, Issue 1 Supplement, pp S239-S246

Tunable visible and near-infrared pulse generator in a 5 fs regime

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Abstract.

Transform-limited (TL) visible pulses with as short a duration as 4.7 fs with a 5 μJ pulse energy have been generated for the first time from a novel noncollinear optical parametric amplifier (NOPA). Both signal–idler group-velocity matching and pulse-front matching are essential to generate coherent down-converted pulses compressible to the TL pulse with more than a 150-THz bandwidth. Tunable operation with bandwidth-limited sub-10-fs pulses in the visible (550–700 nm) and near-infrared (900–1300 nm) ranges, achieved by increasing the seed chirp, is also a remarkable property. The NOPA is believed to be on useful light source for ultrafast spectroscopy on an extremely short time-scale.

Received: 20 November 1999 / Revised version: 27 March 2000 / Published online: 24 May 2000