Influence of liquid crystalline phases on the tunability of a random laser

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dc.contributor	Universitat Politècnica de Catalunya. Departament de Física
dc.contributor	Universitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers
dc.contributor	Universitat Politècnica de Catalunya. GRPFM - Grup de Recerca en Propietats Físiques dels Materials
dc.contributor.author	Trull Silvestre, José Francisco
dc.contributor.author	Salud Puig, Josep
dc.contributor.author	Díez Berart, Sergio
dc.contributor.author	López Pérez, David Orencio
dc.date	2017-05-30
dc.identifier.citation	Trull, J., Salud, J., Diez, S., Lopez, D. Influence of liquid crystalline phases on the tunability of a random laser. "Physical review E", 30 Maig 2017, vol. 95, núm. 5, p. 052704-1-052704-9.
dc.identifier.citation	2470-0045
dc.identifier.citation	10.1103/PhysRevE.95.052704
dc.identifier.uri	http://hdl.handle.net/2117/105854
dc.language.iso	eng
dc.publisher	American Chemical Society (ACS)
dc.relation	https://journals.aps.org/pre/abstract/10.1103/PhysRevE.95.052704
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Àrees temàtiques de la UPC::Física
dc.subject	Àrees temàtiques de la UPC::Física::Termodinàmica
dc.subject	Lasers
dc.subject	Liquid crystals
dc.subject	Thermodynamics
dc.subject	Làsers
dc.subject	Cristalls líquids
dc.subject	Termodinàmica
dc.title	Influence of liquid crystalline phases on the tunability of a random laser
dc.type	info:eu-repo/semantics/submittedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	In this paper, we report the temperature behavior of an optimized disordered photonic system-based liquid crystal by means of heat capacity and refractive index measurements. The scattering system is formed by a porous borosilicate glass random matrix (about 60%) infiltrated with a smectogenic liquid crystal (about 16%) and a small amount of laser dye (0.1%). The rest of the scattering system is about 24% air, giving rise to a high refractive index contrast scattering system. Such a system has the functionality to change the refractive index contrast with temperature due to the liquid crystal temperature behavior. The system, optically pumped by the second harmonic of a Q-switched Nd:YAG pulsed laser working at 532 nm, exhibits random laser action, the threshold of which depends upon the liquid crystalline mesophase. Temperatures of existence of the smectic- B phase correspond to the most optimized random laser. In such a mesophase, the transport mean free path has been determined as about 16 µm in a coherent backscattering experiment.

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