M. Kupfer et al., PHASE-MATCHED 2ND-HARMONIC GENERATION IN CHI(2)-INVERTED LANGMUIR-BLODGETT WAVE-GUIDE STRUCTURES, Electronics Letters, 29(23), 1993, pp. 2033-2034
Phase-matched second-harmonic generation by mode conversion in a new w
aveguide 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 d33. This configuration leads to a large improvement of th
e overlap integral as compared to conventional waveguides. In first ex
periments conversion efficiencies up to 1%W-1cm-2 have been obtained.