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Theses

Effet laser à contre réaction repartie (DFB) excité par voie optique dans les films minces polymères

Abstract : The thesis concerns a study of the laser effect induced in a polymer thin film doped with a laser dye. Resonance of the stimulated emission is created by a longitudinal transient modulation of the gain induced into the active medium. This distributed feedback effect or DFB (contre reaction répartie in French) bears interesting properties regarding spectral selectivity and duration of the emission. The Bragg grating indeed induces a reciprocal amplification of counter-propagating resonant waves. Moreover, the laser cavity exists only during the excitation pulse.
Following theoretical and experimental analysis of semiconductor DFB lasers, the coupled mode theory is applied to the internal parameters relevant to our system. Experimentally, DFB excitation is performed in a Lloyd mirrors interference set-up. It permits to check threshold and accordability of the device through variation of the interfringe. Coupling of the Bragg grating to the laser field is analysed with respect to the modal content of the DFB laser. On another hand, the impact of the wave-guide onto the transverse mode structure is treated independently of the coupled mode theory. The treatment is verified experimentally using a thicker polymer film. Experimental results and simulation within the linear wave-guide propagation theory are in close agreement. Finally, the temporal behaviour of the DFB grating is analysed in a four-wave mixing configuration. It permits to size the maximum delay between laser excitation and emission.
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Submitted on : Saturday, November 18, 2006 - 3:47:26 AM
Last modification on : Friday, May 10, 2019 - 1:02:02 PM
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  • HAL Id : tel-00114855, version 1

Citation

Frank Sobel. Effet laser à contre réaction repartie (DFB) excité par voie optique dans les films minces polymères. Physique Atomique [physics.atom-ph]. Université d'Angers, 2001. Français. ⟨tel-00114855⟩

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