Random Laser and Replica Symmetry Breaking in SiO₂-Rhodamine 6G xerogel powder

Author(s)

Camara, Josivanir G. ; da Silva, Davinson M. ; Ferretti, Stefano ; Gentilini, Silvia ; Conti, Claudio ; Ghofraniha, Neda

• Document type: Journal article
• Source: CNR '09: SECOND INTERNATIONAL WORKSHOP ON COMPOUND NUCLEAR REACTIONS AND RELATED TOPICS; v. 309, p. 2-pg., 2024-01-01.

Abstract

Random laser (RL) based on Rhodamine 6G (Rh6G) doped silica xerogel, fabricated by a conventional sol-gel (SG) synthesis, was observed around 590 nm, in a large band typical from dye RLs. Different from other previous works, where the xerogel is just impregnated or infiltrated with a dye solution, here the Rh6G was added during the SG synthesis. The obtained material was grinded using a mortar and a pestle, and the resulting powder was carefully packed in a sample holder and pumped at 532 nm using a 6 ns pulsed laser. We used spectral and images measurements to perform statistical analysis and describe experimentally the Parisi replica breaking symmetry (RSB) phenomenon in a complex system. These results show that RSB obtained from image is a promising method for RL characterization. Indeed, by calculating the RSB maps, we demonstrate that the RL emission is not a homogenous process, depending on the scattering and gain properties of different regions. (AU)

• FAPESP's process: 23/08033-7 - Machine learning for Random Laser characterization and phase retrieval
• Grantee: Davinson Mariano da Silva
• Support Opportunities: Regular Research Grants