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Limitation of second-harmonic generation of femtosecond Ti:sapphire laser pulses

Ildar A. Begishev, Mikhail Kalashnikov, Vladimir Karpov, Peter Nickles, Horst Schönnagel, Ilya A. Kulagin, and Timurbek Usmanov

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Abstract

The second-harmonic generation of 50-fs Ti:sapphire laser pulses in 1- and 2-mm KDP crystals at 350 mJ of incident energy is measured experimentally and analyzed theoretically. A frequency-conversion efficiency of ∼40% is reached. The limiting influence of self-phase modulation and fundamental phase modulation is demonstrated. The deep modulation of a frequency-doubled spectrum at a high incident intensity is observed. Methods to increase conversion efficiency are proposed.

© 2004 Optical Society of America

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