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Theses

New materials and device architectures for organic solid-state lasers

Abstract : The aim of this thesis is the study of new materials and innovative architectures for organic solid-state lasers. The first axis of this work is dedicated to lasing characterization of a novel organic small molecule called "fvin". Stimulated emission in red part of the spectrum (around 650 nm) was observed in neat film of this material which is generally impossible in the family of organic dyes due to concentration quenching phenomenon. The Variable Stripe Length (VSL) technique was employed to investigate and measure the material gain. The lasing effect was demonstrated in a DBR configuration as well as under the form of random lasing at high pump intensities. The second axis of this thesis is addressing design, realization, emission characterization and behavior modeling of an external-cavity organic laser structure called VECSOL (inspired from the traditional inorganic VECSEL architecture). The gain medium was a layer of PMMA doped with a laser dye (Rhodamine 640), spin casted on a dielectric plane mirror. The laser was characterized with two pump sources with different pulse durations (0.5 ns and 7 ns). We have demonstrated a tunable emission (within a range of more than 40 nm), a diffraction-limited beam and an efficiency record of 57% in an optimized configuration. The dynamics of the emission was modeled through Tang-Statz-de Mars rate equations adapted to the VECSOL geometry. Furthermore, the open cavity of the realized architecture allowed obtaining ultraviolet emission through intracavity frequency doubling in a modified VECSOL geometry.
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https://tel.archives-ouvertes.fr/tel-00643467
Contributor : Hadi Rabbani Haghighi <>
Submitted on : Tuesday, November 22, 2011 - 7:54:23 AM
Last modification on : Saturday, February 15, 2020 - 2:03:20 AM
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  • HAL Id : tel-00643467, version 1

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Hadi Rabbani-Haghighi. New materials and device architectures for organic solid-state lasers. Optics [physics.optics]. Université Paris-Nord - Paris XIII, 2011. English. ⟨tel-00643467⟩

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