Nonlinear refractive index and nonlinear absorption coefficient of high-quality Mn:ZnSe nanocrystals are measured by z-scan technique at 800nm wavelength. The synthesized nanocrystals with nucleation doping have tunable wavelength (between 565610nm), high quantum yield (50%), and high thermal as well as photochemical stabilities. The unique nanocrystal structure (with a MnSe core, Zn1xMnxSe diffusion region, and an outer ZnSe layer) shows size-dependent nonlinear effects, which can be qualitatively explained by a simple model using crystal field. Studies of nonlinear optical properties are very important and necessary for high-power optical applications (such as light-emitting diodes and lasers) of such Mn-doped ZnSe nanocrystals.

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