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ZnO nano particles are synthesized at different percentages of Ag dopant byfacile precipitation method. Two photon absorption (2PA) cross-section andnonlinear refractive index of ZnO nano particles are studied with 130femto-second laser pulses at a repletion rate of 1 kHz with central wavelengthof 532 nm by z-scan technique. The 2PA cross-section of ZnO nano particles areobtained by theoretical calculations, using rate equation approach. Bothabsorption cross-section and nonlinear refractive index increased withincreasing the Ag dopant percentage. We have observed an increase of order of104 in the nonlinear refractive index in the presence of femto-second laserexcitation with reference to nano-second laser excitation.

Third order nonlinear study of ZnO nano particles under femto-second laser illumination