Diffusive random laser modes under a spatiotemporal scope
| Autor: | Jon Azkargorta, Sara García-Revilla, Rolindes Balda, Luís D. Carlos, Edison Pecoraro, Joaquín Fernández, Ignacio Iparraguirre, Macarena Barredo-Zuriarrain |
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| Přispěvatelé: | Eusko Jaurlaritza, Ministerio de Economía y Competitividad (España), European Commission, CSIC-UPV - Centro de Física de Materiales (CFM), Fundação para a Ciência e a Tecnologia (Portugal), Univ Pais Vasco UPV EHU, Mat Phys Ctr CSIC UPV EHU, Donostia Int Phys Ctr, Univ Aveiro, Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
Diffusion (acoustics) Random laser Spatial filter Scattering business.industry Physics::Optics CONFINEMENT FILMS Laser STATISTICS Atomic and Molecular Physics and Optics Characterization (materials science) law.invention SCATTERING MEDIA LIGHT Optics law Spontaneous emission GAIN EMISSION business Lasing threshold |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | At present the prediction and characterization of the emission output of a diffusive random laser remains a challenge, despite the variety of investigated materials and theoretical interpretations given up to now. Here, a new mode selection method, based on spatial filtering and ultrafast detection, which allows to separate individual lasing modes and follow their temporal evolution is presented. In particular, the work explores the random laser behavior of a ground powder of an organic-inorganic hybrid compound based on Rhodamine B incorporated into a di-ureasil host. The experimental approach gives direct access to the mode structure and dynamics, shows clear modal relaxation oscillations, and illustrates the lasing modes stochastic behavior of this diffusive scattering system. The effect of the excitation energy on its modal density is also investigated. Finally, imaging measurements reveal the dominant role of diffusion over amplification processes in this kind of unconventional lasers. Financial support for this work was provided by the Spanish Government under project FIS2011-27968, by the Basque Country Government (IT-659-13) and Saiotek (SPE11UN072), and by the Fundaçao para a Ciência e a Tecnologia (FCT, Portugal), FEDER and COMPETE, under contract Pest-C/CTM/LA0011/2013. SGR thanks the Research Association MPC for a post-doctoral appointment. |
| Databáze: | OpenAIRE |
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