Phase-matched second-harmonic generation in chi /sup (2)/-inverted Langmuir-Blodgett waveguide structures

摘要

Phase-matched second-harmonic generation by mode conversion in a new waveguide structure fabricated by the Langmuir-Blodgett (LB) technique is demonstrated. The nonlinear optically active part of the waveguide consists of two LB layers with opposite sign to the nonlinear optical coefficient d/sub 33/. This configuration leads to a large improvement of the overlap integral as compared to conventional waveguides. In first experiments conversion efficiencies up to 1%W/sup -1/cm/sup -2/ have been obtained.