Enhanced SHG power using periodic poling of and vinylidene cyanide/vinyl acetate copolymer

Embedding poling-inverted corrugation of the optical nonlinear susceptibility into vinylidene cyanide/vinyl acetate organic copolymer, the second-harmonic (SH) power has been enhanced at pulsed Nd:YAG 1.06 /spl mu/m and Er:YAG 2.94 /spl mu/m laser lines by quasi-phase matching (QPM) the interaction between the fundamental and SH waves. Using a sample with a corrugation period of 120 /spl mu/m with poling corrugated by an interdigital electrode, an enhancement factor of about 94 and /spl sim/3 was obtained at 1.06 /spl mu/m and 2.94 /spl mu/m, respectively, in comparison with a bulk sample having uniform poling. Taking the first-order QPM, the maximum conversion efficiency was also about 0.001 percent at the wavelength /spl lambda//sub /spl omega//=1.06 /spl mu/m, with the fundamental peak power P/sub /spl omega// of 2.5 W, and the extinction coefficients of /spl alpha//sub /spl omega//=/spl alpha//sub 2/spl omega//=0.7 mm/sup -1/ in the film having a path length of 2.4 mm, while /spl sim/0.03 percent at /spl lambda//sub /spl omega//=2.94 /spl mu/m with P/sub /spl omega//=200 W, and /spl alpha//sub /spl omega//=1.4 mm/sup -1/ and /spl alpha//sub 2/spl omega//=0.7 mm/sup -1/ for the same film.<
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