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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2025-07-06 15:32 |
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Conference: Bucharest University Faculty of Physics 2025 Meeting
Section: Polymer Physics
Title:
From Spontaneous Emission to Laser Action in Innovative Fluorescent Micro-Systems
Authors:
Valentin BARNA
Affiliation:
University of Bucharest, Faculty of Physics, PO Box MG 11, Magurele-Bucharest, Romania
E-mail
barnavalentin@yahoo.com
Keywords:
Light Amplification, Organic LASERs, Flexible Dye Dopped Systems, Free Standing and Freely Suspended Thin Films.
Abstract:
Phenomena such as light amplification and random lasing have lately attracted considerable interest within the scientific community, supported by comprehensive theoretical analyses and experimental investigations. These phenomena exemplify complex systems where multiple scattering of photons intersects with optical amplification processes, resulting in intriguing and multifaceted behaviors. The interplay between light localization and random lasing is especially compelling, given the contrasting characteristics inherent to each lasing mechanism and the distinctive emission properties exhibited by localized modes. Herein, we present evidence of laser emission originating from dye-doped compact structures, which are either confined within boundaries or entirely devoid of such constraints, thereby expanding the understanding of lasing phenomena in boundaryless and boundary-confined systems. The optical emission characteristics such as spectral analysis, the dynamic behavior observed both below and above the lasing energy threshold, emission efficiency metrics, far-field spatial profiles of the lasing modes, intensity distribution patterns, and temporal emission dynamics collectively serve to substantiate the occurrence of light amplification phenomena and definitively confirm that the laser emission emanates from our mirrorless device configurations. The proposed emissive systems distinguish themselves through several advantageous attributes, including a demonstrably low lasing threshold, exceptional energy efficiency, sustained long-term operational stability, a smooth fabrication process, and an extensive array of potential design configurations, rendering them highly versatile and promising for advanced photonic applications. These materials are highly suitable candidates for the fabrication of compact, flexible laser systems, and we anticipate their forthcoming integration into pivotal sectors such as contemporary biomedical applications, advanced optics and photonics, as well as the broader field of materials science.
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