Multiphoton absorption and refraction in Mn~(2+) doped ZnS quantum dots

摘要

Four-photon absorption and self-defocusing nonlinear refraction are reported for the first time in ZnS and Mn~(2+) doped ZnS quantum dots of sizes 2-3 nm with 1064 nm radiation from a Q-switched neodymium doped yttrium aluminum garnet laser at a peak intensity of 2.5 GW/cm~2.