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Efficient femtosecond traveling-wave optical parametric amplification in periodically poled KTiOPO4

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Abstract

We report, for the first time to our knowledge, high-power femtosecond traveling-wave optical parametric amplification by use of periodically poled KTiOPO4. With a single pass through a 4-mm-long sample of 1.23-mm thickness we achieved 40% internal conversion efficiency and 5 µJ of single-pulse idler energy near 3.8 µm, using only 75 µJ of energy from the output of a conventional 1-kHz Ti:sapphire regenerative amplifier. The 210-fs-long idler pulses were almost transform limited. We discuss the specific problems encountered in high-power parametric conversion, such as unwanted quasi-phase-matched upconversion processes for polarization configurations that utilize the largest d33 nonlinear coefficient and the related formation of color centers (gray tracking) in KTiOPO4.

© 1999 Optical Society of America

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