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Published September 24, 2007 | public
Journal Article Open

Optical parametric generation in periodically poled KTiOPO4 via extended phase matching


We report an experimental demonstration of optical parametric generation in a periodically poled KTiOPO4 crystal based on the principle of mirrorless optical parametric oscillation. A femtosecond pump pulse spectrally centered at 792 nm from a Ti:sapphire amplifier is prechirped to minimize Kerr effects. The pump pulse is then injected into the nonlinear crystal and down converted to signal and idler pulses, approximately centered at 1584 nm, via amplified spontaneous parametric down conversion in a copropagating type-II quasiphase matching configuration. The maximum internal downconversion efficiency is 43%, the highest ever reported for optical parametric generators based on KTiOPO4 crystals. Such a device may find applications in optical signal processing and biological imaging.

Additional Information

©2007 American Institute of Physics. (Received 10 July 2007; accepted 8 September 2007; published online 28 September 2007) We thank Karsten Buse and Ingo Breunig for helpful discussions, Changhuei Yang for lending us the spectrum analyzer, and Martin Centurion for the measurement of self-focusing in KTP. This work is supported by the National Science Foundation through the Center for the Science and Engineering of Materials (DMR-0520565) and the DARPA Center for Optofluidic Integration.


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