Abstract
Efficient Second Harmonic Generation (SHG) has been a continuing goal for not only frequency conversion but also for cascading effects such as all-optical switching, spatial solitary waves, etc1. To date high efficiencies have been demonstrated only in ferroelectric crystals.2 However, some poled polymers have even higher nonlinear coefficients and offer ease of processing and low cost fabrication. Several phase-matching techniques have been demonstrated in poled polymers, such as quasi-phase-matching (QPM)3-6, modal dispersion phase matching7-9, Cerenkov phase-matching10-12, and anomalous dispersion phase matching13. However, very few experiments have progressed from the slab to the channel waveguide stage. We demonstrate phase-matched SHG in a channel waveguide made of 4-dimethylamino-4’-nitrostilbene (DANS) side-chain polymer. Our SHG figure of merit η=P2ω/(PωL)2=14 %/W-cm2 is the highest non-resonant value reported for poled polymers and is competitive with those of the best inorganic crystals14.
© 1996 Optical Society of America
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