Effective dielectric functions of the tungsten and tungsten oxide particles under high power laser pumping

A method for recovering the laser-pump-dependent effective dielectric functions of Rayleigh and Mie particles is discussed. Values of the pump-dependent intensity of non-linear scattering and non-linear extinction of diluted suspensions of particles are applied as input parameters in the recovery procedure. These values are obtained using a modified z-scan technique with simultaneous measurements of the intensity of light scattered at the right angle to the direction of the probe laser beam. Two modifications of the recovery procedure, which are applicable in cases of small-sized (Rayleigh) and large-sized (Mie) particles are considered. The recovery techniques were verified using experimental data and simulation results for suspensions of tungsten and tungsten oxide particles with various sizes.