PHASE-MATCHED 2ND-HARMONIC GENERATIONS IN POLED POLYMER-FILMS BASED ON POLY (METHYL-METHACRYLATE) CONTAINING A P-AMINOPHENYL-CYCLOBUTENEDIONE MOIETY AS THE SIDE-CHAINS

Poled polymer films containing a nonlinear optical active moiety (cycl obutenedione derivative) as the side chains were prepared and applied to frequency doublings in guided-wave structures. A (p-aminophenyl) cy clobutenedione containing monomer, amino]-phenyl}-2-methylamino-cyclob utene-3,4-dione [CD1-MA] was newly synthesized. For less than 20 wt% c oncentration, amorphous copolymers of CD1-MA with methyl methacrylate showed the glass transition at around 125-degrees-C. The copolymers we re crystalline at higher dye concentrations. The d33 value of the pole d polymer film with 10 wt% of CD1-MA concentration was estimated as 8. 1 pm.V-1 by the Maker fringe method. Second harmonic waves of Nd:YAG l aser (1064 nm) were observed in three-layer optical waveguides ( air / poled polymer / pyrex glass ) for the collinear type and the Cerenkov type phase matchings.