PERIODIC DOMAIN INVERSION IN THIN NONLINEAR-OPTICAL POLYMER-FILMS FOR 2ND-HARMONIC GENERATION

This paper reviews recent progress in the fabrication of periodic structures in poled polymer films for quasi phase matched frequency doubling. In the case of waveguides a new two step poling process is demonstrated for periodic domain inversion, such that the sign of chi(2) changes every coherence length. Quasi phase matched frequency doubling is also demonstrated in periodic free standing films with picosecond lasers resulting in efficiencies of 10(-2)%.