title: 1Low threshold random lasing in dye-doped silica nano powders.
abstract: Random laser action is demonstrated in two kinds of powder samples containing rhodamine 6G (Rh6G) doped SiO2 nanoparticles which are either directly dispersed within pure silica particles or embedded in a silica gel matrix which is subsequently ground. Both organic-inorganic hybrid materials present different laser thresholds and emission features which are systematically studied and compared. The dependence of the emission kinetics, emission spectrum, random laser threshold and slope efficiency on the dye doped nanoparticles concentration is investigated in both cases. We also explore if the incorporation of additional TiO2 scatterers could enhance the random laser operation of the studied systems.
authors: Departamento Física Aplicada I, Escuela Técnica Superior de Ingeniería, Alda. Urquijo s/n 48013 Bilbao, Spain.
authors: Sara
authors: S
authors: García-Revilla
authors: Marcos
authors: M
authors: Zayac
authors: Rolindes
authors: R
authors: Balda
authors: Mohammad
authors: M
authors: Al-Saleh
authors: David
authors: D
authors: Levy
authors: Joaquín
authors: J
authors: Fernández
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D007700:Kinetics; D007834:Lasers; D036103:Nanotechnology / Q000379:methods*; D055095:Optics and Photonics; D011108:Polymers / Q000737:chemistry*; D011208:Powders; D012542:Scattering, Radiation; D012822:Silicon Dioxide / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D011108:Polymers; D011208:Powders; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium