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Preparation of chi (2)-inverted waveguides with poled polymers for efficient second-harmonic generation

 

Park, Y.-S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.; United States, Office of Naval Research:
Optoelectronic Integrated Circuits 1997 : 12-14 February 1997, San Jose, California
Bellingham/Wash.: SPIE, 1997 (SPIE Proceedings Series 3006)
ISBN: 0-8194-2417-X
S.382-389
Optoelectronic Integrated Circuits Conference (OEIC) <1, 1997, San Jose/Calif.>
Englisch
Konferenzbeitrag
Fraunhofer HHI ()
dielectric polarisation; electro-optical effects; integrated optics; optical harmonic generation; optical polymers; optical waveguides; thermal analysis; poled polymer chi (2)-inverted waveguides; poled polymers; second-harmonic generation; modal dispersion phase-matched second harmonic generation; polymer-based waveguides; nonlinear optical core; side-chain polymers; glass-transition temperature; optimized overlap integral; step-like nonlinearity profile; core thickness; thermally assisted poling steps; opposite poling field; in-situ electro-optic monitoring; electro-optic thermal analysis; second harmonic generation thermal analysis; conversion efficiency; waveguide second-harmonic generation

Abstract
Modal dispersion phase-matched second harmonic generation is demonstrated in polymer-based waveguides with a nonlinear optical core consisting of two side-chain polymers with different glass-transition temperatures. For an optimized overlap integral, a step-like nonlinearity profile ( chi (2)-inverted structure) is required across the core thickness. The chi (2)-inverted structure is achieved by two consecutive thermally assisted poling steps above and between the respective glass-transition temperatures, with an opposite poling field in the second poling step. The achieved chi (2)-inverted structure is monitored by in-situ electro-optic measurements and proved by electro-optic and second harmonic generation thermal analysis. Conversion efficiencies up to 7%/Wcm2 were achieved in first waveguide second-harmonic generation experiments.

: http://publica.fraunhofer.de/dokumente/N-13219.html