Third order nonlinearity and optical limiting behaviors of Yb:YAG nanoparticles by Z-scan technique

The present report explores third order nonlinear optical behavior of phase pure Yb3+:YAG nanoparticles for the first time by Z-scan technique. The measurement was carried out using diode pumped continuous wave (CW) Nd:YAG laser at 532 nm. The Yb:YAG nanoparticles exhibit characteristic near-infrared (NIR) emission at 1030 nm under 940 nm excitation. The nanoparticles exhibit high nonlinear refractive index (n(2) = 8.649 x 10(-8) cm(2)/W) and low nonlinear absorption coefficient (beta= 0.109 x 10(-4 )cm/W) giving an appreciable figure of merit (FOM) of similar to 74.50. The excitation power (8.2-10.5W cm(-2 )) dependent emission spectra were recorded to study exchange energy interaction of Yb3+ ions with YAG host lattice. By utilizing the nonlinear refractive index 'n(2)' from Z-scan measurement, thermo-optic coefficient (dn/dt) was calculated to demonstrate Yb3+ :YAG nanomaterial for high power compact solid state laser gain amplifier systems.