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24 October 2000 Quasi-phase-matched NLO waveguides using periodically corona-poled liquid crystalline polymers
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Abstract
Quasi-phasematched (QPM) Second Harmonic Generation (SHG) in poled polymer waveguides has been realized. Rib-waveguide devices were fabricated by lithographic techniques like multilayer spin coating and reactive ion etching, well known from semiconductor technology. Guest-host-systems [Cyanobiphenyl-Polymethylmethacrylat (CN-PMMA)] as well as co-polymers have been used as the NLO-waveguiding layer between Perfluorcyclobutane (PFCB) layers acting as lower refractive index claddings. Cut-off experiments yield waveguide losses of 3 dB/cm and endfire coupling losses of 3 - 5 dB. The QPM-period has been determined experimentally to (Lambda) approximately equals 20 micrometer for a 4 micrometer wide Rib- waveguide by recording Maker fringes. Periodically poled waveguides were realized using Corona poling in combination with corrugated surfaces. The period (Lambda) of the poling structure was varied continuously between 15 micrometer and 30 micrometer using a fan-shaped corrugation structure. SHG tuning curves exhibit a relative acceptance bandwidth of 3.7 times 10-3 which indicates an effective interaction length leff over the full waveguide length of 4 mm.
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Gerd Priebe, Kai Kunze, Florian Kentischer, R. Schulz, O. Morales, Rainer Macdonald, and Hans Joachim Eichler "Quasi-phase-matched NLO waveguides using periodically corona-poled liquid crystalline polymers", Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); https://doi.org/10.1117/12.405317
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