Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.13: Poster
Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof
Femtosecond-laser written waveguides in KTP for type II second harmonic generation — •Sebastian Müller1, Thomas Calmano1, Manuel Kirchen1, Christian Kränkel1,2, Carlota Canalias3, Fredrik Laurell3, and Günter Huber1,2 — 1Universität Hamburg, Institut für Laser-Physik, Hamburg, Germany — 2The Hamburg Center for Ultrafast Imaging, Hamburg, Germany — 3Department of Applied Physics, KTH, Albanova, Stockholm, Sweden
KTiOPO4 (KTP) is a very suitable material for nonlinear optics due to a number of favorable properties like high nonlinear optical coefficients, wide transparency, good mechanical properties and strong resistance to visible light. It exhibits an extraordinary wide phasematching bandwidth for noncritical Type II frequency doubling of fundamental wavelengths around 1 µm. The technique of fs-laser writing gives the possibility to produce waveguiding structures in various active and passive dielectric media with the advantage of light confinement over long distances. In this contribution we present our results of efficient second harmonic generation in KTP waveguides. The waveguides were produced by writing double track structures in a 9.5 mm long z-cut KTP sample. Structures written with a track spacing of 22 µm enabled waveguiding of low loss (< 0.8 dB/cm) circular single modes. 1.3 mW of light at a wavelength of 540.4 nm were achieved by frequency doubling the output of an Yb-fiber laser. This led, compared to the launched power of 126 mW to a normalized conversion efficiency of 9.1%/(Wcm2).