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Q: Fachverband Quantenoptik und Photonik
Q 18: Laser development and applications III
Q 18.7: Vortrag
Dienstag, 18. März 2014, 12:00–12:15, DO26 207
Frequency-doubling in fs-laser-written waveguides in periodically poled KTP — •Sebastian Müller1, Thomas Calmano1, Fredrik Laurell2, Carlota Canalias2, Christian Kränkel1,3, and Günter Huber1,3 — 1Institut für Laser-Physik, Universität Hamburg, Germany — 2Department of Applied Physics, KTH, Stockholm, Sweden — 3The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Germany
Efficient second harmonic generation requires high light intensity and a long interaction length between the fundamental wavelength and the generated signal. In waveguides, both conditions are combined. Here we report on fs-laser written waveguides in periodically poled KTiOPO4 (PPKTP) crystals. KTP is a suitable and well established material for frequency doubling of 1 µm radiation and suitable for the inscription of low-loss waveguiding structures using intense fs-laser pulses. We inscribed the waveguides into a 9.5 mm long, x-propagating, periodically poled KTiOPO4 for frequency doubling a wavelength of 943 nm. Waveguiding was achieved parallel to the z-axis between two parallel fs-laser written tracks of modified material with spacings of 17 µm to 19 µm. At a distance of 18 µm the guided IR mode had an elliptically shape with diameters of 12.8 µm × 22.3 µm and losses below 2 dB/cm. Under 1.6 W of incident IR radiation at 943 nm we obtained 76 mW of blue output at 472 nm, corresponding to a single-pass normalized conversion efficiency of 4.6 %/Wcm2.