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First evidence of stimulated emission from a monolithic organic single crystal: α-Octithiophene

Authors

  • Dr. Denis Fichou,

    Corresponding author
    1. Laboratoire des Matériaux Moléculaires, UPR 241, CNRS 2, rue Henry Dunant, F-94320 Thiais (France)
    • Laboratoire des Matériaux Moléculaires, UPR 241, CNRS 2, rue Henry Dunant, F-94320 Thiais (France)
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  • Dr. Stephane Delysse,

    1. LETI (CEA-Technologies Avancées) DEIN/SPE, Groupe Composants Organiques CEA Saclay F-91191 Gif-sur-Yvette (France)
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  • Dr. Jean-Michel Nunzi

    1. LETI (CEA-Technologies Avancées) DEIN/SPE, Groupe Composants Organiques CEA Saclay F-91191 Gif-sur-Yvette (France)
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  • G. Horowitz is acknowledged for discussions of his observations of stimulated emission in α-sexithiophene [26], made independently of this work.

Abstract

The gap between laser dyes and luminescent polymers—on the way to the polymer laser diode‒is bridged by conjugated oligothiophenes, according to the results reported here. Evidence for optically pumped spectral narrowing in ultrathin single crystals of α-octithiophene (α-8T) is presented. For example, the gain narrowing of two narrow emission lines that appear when the crystals are pumped can be described in the usual framework of stimulated emission. In contrast to dye-doped crystals, α-8T provides both the emitter and the optical cavity.

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