Optics and Photonics Society of Iran

 In this paper, we experimentally investigate the random lasing emission from tungsten oxide particles in Rhodamine 6G solution. Due to the importance and applications of tungsten oxide in gas sensors, electrochromic materials, photoelectrodes and other optoelectrical devices, we choose this material as the scattering centers in random media. Up to our knowledge, it is for the first time that this work is done. Tungsten oxide particles provide optical feedback by multiple light scattering. Optical gain is provided by Rhodamine 6G solution through stimulated emission. For optical excitation of the sample, we use the second harmonic of Nd-YAG pulsed laser with the wavelength of 532 nm. Also we investigate the effect of the variation of WO₃ particle concentrations on random lasing threshold. Our results show that single mode random lasing emission is achieved from the sample, by adding tungsten oxide particles to Rhodamine 6G solution. Also we calculate the threshold pumping energy for each of the prepared samples containing different concentrations of tungsten oxide particles. Calculated results show that by increasing the concentrations of the scattering centers, random lasing threshold is decreased.