Random lasing in a nanocomposite medium
| Autor: | Tasoltan T. Basiev, Sergei N. Smetanin |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Ytterbium
Nanocomposite Random laser Materials science business.industry Scattering Physics::Optics chemistry.chemical_element Statistical and Nonlinear Physics Dielectric Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science symbols.namesake Optics chemistry symbols Optoelectronics Electrical and Electronic Engineering Rayleigh scattering business Refractive index Lasing threshold |
| Zdroj: | Quantum Electronics. 43:63-70 |
| ISSN: | 1468-4799 1063-7818 |
| DOI: | 10.1070/qe2013v043n01abeh014944 |
| Popis: | The characteristics of a random laser based on a nanocomposite medium consisting of a transparent dielectric and scattering doped nanocrystals are calculated. It is proposed to use ytterbium laser media with a high concentration of active ions as nanocrystals and to use gases, liquids, or solid dielectrics with a refractive index lower than that of nanocrystals as dielectric matrices for nanocrystals. Based on the concept of nonresonant distributed feedback due to the Rayleigh scattering, an expression is obtained for the minimum length of a nanocomposite laser medium at which the random lasing threshold is overcome. Expressions are found for the critical (maximum) and the optimal size of nanocrystals, as well as for the optimal relative refractive index of nanocomposites that corresponds not only to the maximum gain but also to the minimum of the medium threshold length at the optimal size of nanocrystals. It is shown that the optimal relative refractive index of a nanocomposite increases with increasing pump level, but is independent of the other nanocomposite parameters. |
| Databáze: | OpenAIRE |
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