A new dye Trans-4-[p-(N,N-diethylamino) styryl]-N-methylpyridinium iodide (
abbreviated as DEASMPI) has been synthesized. The two-photon absorption (TP
A), TPA-induced frequency upconversion emission, and two-photon pumped (TPP
) frequency upconverted lasing properties of this new dye have also been ex
perimentally studied. This new dye has a moderate TPA cross section of sigm
a (2) = 6.9 x 10(-48) cm(4 .) s/phofon at 1064 nm, but exhibits a high lasi
ng efficiency. The net conversion efficiency from the absorbed 1064-nm pump
pulse energy to the 628-nm up-converted lasing energy is 3.2% at the pump
energy level of 3 mJ. (C) 2001 society of Photo-Optical instrumentation Eng
ineers.