Abstract

We report efficient noncollinear optical parametric amplification (NOPA) of ultrabroadband near-IR pulses tunable in the 1.11.5μm range at a repetition rate of 250kHz. Improved generation of smooth near-IR continua (extending over 1.01.6μm) at 250kHz was achieved by weakly focusing 20% of the 1W driving laser beam into a sapphire plate with longer focal length lenses than previously reported. Using bulk potassium-titanyl phosphate (KTiOPO4) pumped at 800nm, powers as high as 11mW (14% pump conversion efficiency) and signal pulse durations as short as 23fs were obtained after a single white-light seeded NOPA stage.

© 2010 Optical Society of America

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