3RD-ORDER NONLINEAR-OPTICAL PROPERTIES OF DISPERSE-RED-1 AND AU NANOMETER-SIZE PARTICLE-DOPED ALUMINA FILMS PREPARED BY THE SOL-GEL METHOD

Disperse Red 1 (DR1) and Au nanometer-size particle-doped alumina film s have been prepared by the sol-gel method and then their third-order nonlinear optical (NLO) properties have been examined by the degenerat ed four-wave mixing method. The doped films have absorption peaks whic h are close to the second harmonics from KTP crystal pumped by a Nd-YA G laser. Therefore, the third-order nonlinear susceptibility chi((3)) values at 532 nm were enhanced by resonance effect and gave high chi(( 3)) values of similar to 10(-15) m(2)/v(2) (similar to 10(-7) esu). (C ) 1998 Elsevier Science S.A. All rights reserved.