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Novel colourless side-chain methacrylate copolymers exhibiting relatively narrow charge-transfer bands at 335 nm and second-order optical nonlinearities up t o d33 = 4.3 p m V-1 (at 1064 nm) have been synthesized and characterized.Recently, poled polymers with high second-order nonlinearities (x2) have raised much interest as promising candidates for electro-optic switching and second-harmonic generation (SHG).1,2 The theory of molecular contributions (p) to

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).

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.