Abstract
The use of optical parametric generation and amplification following a high-repetition-rate Ti:sapphire femtosecond amplifier1 has been demonstrated to be a good method for obtaining widely tunable femtosecond pulses. Tunable radiation covering the range from 440 nm to 3 µm has been produced at kilohertz repetition rates by using type-I optical parametric generation in BBO.2 Type-II parametric generation has also been demonstrated in BBO, leading, to tunable radiation in the 1-2.5-µm range.3 We show here that direct emission in the visible is possible, even when a near-infrared laser is used for pumping.
© 1995 Optical Society of America
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