We report on the design and characterization of methylmethacrylate copolymers with nonlinear optical 4-alkoxy-4′-alkylsulfone stilbene sidechains, which are transparent down to 410 nm. A fairly stable, polar orientation has been obtained by means of electric field poling, resulting in a reasonably high nonlinearity (d33≤9 pm/V).

We report the design, manufacture, and characterization of poled polymer multilayer waveguides for frequency doubling. Phase matching is obtained by using modal dispersion between the zeroth-order fundamental lightwave and the first-order second-harmonic wave. By incorporating a very thin high refractive index satellite layer, the phase-match condition can be fulfilled with concomitant large overlap between the two waves, resulting in efficient doubling.

The non-critical phase-matching wavelength of KLN can be tuned from 790 to over 920 nm by adjusting the lithium content of the crystals. This variation covers the operational range of (A1,Ga)As-lasers. The use of KLN in a monolithic-ring-resonator frequencydoubling setup will provide a stable, highly efficient blue laser capable of high-density optical recording.