Disorder as a Playground for the Coexistence of Optical Nonlinear Effects: Competition between Random Lasing and Stimulated Raman Scattering in Complex Porous Materials

Nicolas Bachelard; Preeti Gaikwad; Rénal Backov; Patrick Sebbah; Renaud A.L. Vallée

doi:10.1021/ph500280m

Disorder as a Playground for the Coexistence of Optical Nonlinear Effects: Competition between Random Lasing and Stimulated Raman Scattering in Complex Porous Materials

Nicolas Bachelard, Preeti Gaikwad, Rénal Backov, Patrick Sebbah, Renaud A.L. Vallée

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

We predict the coexistence and competition of random lasing and stimulated Raman scattering (SRS) in active disordered random media. We develop a simple model that includes both mechanisms coupled to diffusion equation. We find that the prevalence of a nonlinear mechanism over the other is determined by the degree of scattering. This is confirmed experimentally in dye-infiltrated three-dimensional porous silica-based disordered samples, with controllable pore size and transport properties. Experimentally, random lasing dominates in a sample with a large transport mean free path, l_t ≈ 100 μm, while it gives way to SRS for l_t ≈ 25 μm. The competition is explained in terms of disorder-dependent pump depletion and fluorescence saturation.

Original language	English
Pages (from-to)	1206-1211
Number of pages	6
Journal	ACS Photonics
Volume	1
Issue number	11
DOIs	https://doi.org/10.1021/ph500280m
State	Published - 19 Nov 2014
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society. (Graph Presented).

Keywords

Raman lasers
nonlinear effects
porous materials
random lasers

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10.1021/ph500280m

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abstract = "We predict the coexistence and competition of random lasing and stimulated Raman scattering (SRS) in active disordered random media. We develop a simple model that includes both mechanisms coupled to diffusion equation. We find that the prevalence of a nonlinear mechanism over the other is determined by the degree of scattering. This is confirmed experimentally in dye-infiltrated three-dimensional porous silica-based disordered samples, with controllable pore size and transport properties. Experimentally, random lasing dominates in a sample with a large transport mean free path, lt ≈ 100 μm, while it gives way to SRS for lt ≈ 25 μm. The competition is explained in terms of disorder-dependent pump depletion and fluorescence saturation.",

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AU - Sebbah, Patrick

AU - Vallée, Renaud A.L.

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AB - We predict the coexistence and competition of random lasing and stimulated Raman scattering (SRS) in active disordered random media. We develop a simple model that includes both mechanisms coupled to diffusion equation. We find that the prevalence of a nonlinear mechanism over the other is determined by the degree of scattering. This is confirmed experimentally in dye-infiltrated three-dimensional porous silica-based disordered samples, with controllable pore size and transport properties. Experimentally, random lasing dominates in a sample with a large transport mean free path, lt ≈ 100 μm, while it gives way to SRS for lt ≈ 25 μm. The competition is explained in terms of disorder-dependent pump depletion and fluorescence saturation.

KW - Raman lasers

KW - nonlinear effects

KW - porous materials

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Disorder as a Playground for the Coexistence of Optical Nonlinear Effects: Competition between Random Lasing and Stimulated Raman Scattering in Complex Porous Materials

Abstract

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