Femtosecond parametric upconversion in the visible region

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