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Efficient femtosecond optical parametric generator with a birefringent delay compensator

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Abstract

A novel method based on a birefringent crystal is presented to compensate for the group-velocity mismatch between a femtosecond pulsed pump and the signal or idler in an optical parametric generator (OPG). With a thin calcite plate inserted between two β-barium borate crystals for synchronization, an efficient four-pass OPG pumped by a frequency-doubled ∼200-fs Ti:sapphire laser is obtained. The conversion efficiency is almost doubled throughout the whole tunable region compared with a conventional OPG pumped at the same power density, indicating that the total conversion efficiency of femtosecond optical parametric amplifier system can be raised significantly by use of this new four-pass OPG to generate the seed.

© 2001 Optical Society of America

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