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Journal Articles Applied Physics Letters Year : 2010

Waveguiding-assisted random lasing in epitaxial ZnO thin film

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Abstract

Zinc oxide thin films were grown on c-sapphire substrates using pulsed laser deposition. Pump power dependence of surface emission spectra, acquired using a quadrupled 266 nm laser, revealed room temperature stimulated emission (threshold of 900 kW/cm2). Time dependent spectral analysis plus gain measurements of single-shot, side-emission spectra pumped with a nitrogen laser revealed random lasing indicative of the presence of self-forming laser cavities. It is suggested that random lasing in an epitaxial system rather than a three-dimensional configuration of disordered scattering elements was due to waveguiding in the film. Waveguiding causes light to be amplified within randomly formed closed-loops acting as lasing cavities.

Dates and versions

hal-02473076 , version 1 (10-02-2020)

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P.-H. Dupont, Christophe Couteau, D. J. Rogers, F. Hosseini Teherani, Gilles Lerondel. Waveguiding-assisted random lasing in epitaxial ZnO thin film. Applied Physics Letters, 2010, 97 (26), pp.261109. ⟨10.1063/1.3527087⟩. ⟨hal-02473076⟩

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