TITLE:
Random Laser of R6G Dye and TiO2 Nanoparticals Doped in PMMA Polymer
AUTHORS:
Baha T. Chiad, Kamil H. Latif, Firas J. Kadhim, Mohammad A. Hammed
KEYWORDS:
Random Laser, Random Gain Media, Laser Resonator
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.1 No.2,
September
30,
2011
ABSTRACT: The random laser (RL) based on organic Rhodamine 6G (R6G) laser- dye and Titanium dioxide (TiO2) suspended nanoparticles have been prepared with polymethylmethacrylate (PMMA) as a host. Both liquid and spray-coated homogeneous film samples of 22.4 µm - 30.1 µm thickness range were use. Optimum concentrations have been determined depending on the normal fluorescence spectra which give evidence that the laser dye provides amplification and TiO2 nanoparticles as scatter center. At the optimum concentrations, results of the random laser (RL) under second harmonic Nd: YAG laser ex-citation show that the values of bandwidth at full width half-maximum (FWHM) and the threshold energy are about 9 nm and 15 mJ respectively, which represent the minimum value for the liquid samples in the current research. Correspondly, these values become 14 nm and 15 mJ for film sample. The broadening that can be attributed to the concentration quenching of a laser dye at high concentration levels has been observed.