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Determination of threshold random gain medium in dye: Polymer films containing TiO<sub>2</sub> nanoparticles
Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq
Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq
Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq
Ministry of Environment, Baghdad, Iraq
- 1 Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq
- 2 Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq
- 3 Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq
- 4 Ministry of Environment, Baghdad, Iraq
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Abstract
Random gain medium based on organic Rhodamine 590 (R590) laser-dye and Titanium dioxide (TiO2) suspended nanoparticles have been prepared with polymethylmethacrylate (PMMA) as a host. Spray-coated homogeneous film samples of 22.4 μm thickness. Optimum concentrations have been determined depending on the normal fluorescence spectra which give evidence that the laser dye provides amplification and TiO 2 nanoparticles act as scatter center. At the optimum concentrations, results of the random gain medium under second harmonic Nd: YAG laser excitation shows that the values of bandwidth at full width half-maximum (FWHM) and the threshold energy are about 11 nm and 10 mJ respectively.
KeywordsRandom Gain MediumRandom LaserInternal Resonator
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