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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Efficient cw high-power frequency doubling in periodically poled KTP

Torabi-Goudarzi, Firuz and Riis, Erling (2003) Efficient cw high-power frequency doubling in periodically poled KTP. Optics Communications, 227 (4-6). pp. 389-403. ISSN 0030-4018

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Abstract

We report on efficient second harmonic generation in periodically poled KTiOPO4 (ppKTP) at 423 nm pumped by a Ti:Sapphire solid state laser system. An overall optical conversion efficiency of over 60% was achieved at a moderate input power of 400 mW. The nonlinear crystal used in the experiments was a first-order quasi-phase-matched flux-grown KTP crystal (period 4 μm, length 10 mm). The crystal has a single-pass conversion efficiency of 1.38±0.08%/W cm and was placed in a ring cavity. We have demonstrated stable operation with a generated cw power at 423 nm of up to 225 mW. With a sweeping cavity we generated 425 mW peak power with an incident pump power of 680 mW. At this power level it was not possible to lock the cavity due to a bistability caused by localised heating of the crystal.