Widely tunable femtosecond optical parametric amplifier at 250 kHz with a Ti:sapphire regenerative amplifier.

A Ti:sapphire mode-locked regenerative amplifier system pumped with a single argon-ion laser produces 4-μJ, 170-fs pulse of 800-nm wavelength at a 250-kHz repetition rate. Part of this output is used to generate a high-beam-quality white-light continuum, while the rest is doubled to 400 nm and used to parametrically amplify visible components of this continuum to more than 100 nJ. Synchronized with the visible signal pulse tunable from 460 to 700 nm is an infrared idler pulse tunable from 2.4 to 0.9 μm.

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