Three new chromophores and 4-nitro-benzoic acid 2-( |4-[2-(4- dimethylamino-phenyl)-vinyl]-phenyl|-ethylamino)-ethyl ester (DMANHAS) have been synthesized and the structures have been characterized by 'H NMR, IR and elemental analyses. Linear absorption, single- photon induced fluorescence and two-photon induced fluorescence are experimentally studied. When pumped with 800 nm laser irradiation, 2-( |4-[2-(4-dimethylamino-phenyl)-vinyl ] -phenyl | - ethylamino )-ethanol (DMAHAS ) and 2-(14-[ 2-( 4-diethylamino-phenyl) - vinyl ]-phenyl (-ethylamino)-ethanol (DEAHAS) show strong two-photon induced blue fluorescence at 436 and 440 nm respectively, while DMANHAS and 4-nit.ro-benzoic acid 2-( |4-[2-(4-diethylamino-phenyl)- vinyl]-phenyl(-ethylamino)-ethyl ester (DEANHAS) exhibit no fluorescence.

Key words: STYRENE P, NON LINEAR OPTICS, UV, FLUOROSPECTROPHOTOMETRY, UP-CONVERESION LUMINESCENCE