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Abstract : Commercial extended-cavity semiconductor lasers provide a continuously tunable single-mode emission around 1550 nm over a range as large as 150 nm. Nevertheless, such performances require an excellent mechanical stability and very accurate adjustments. Moreover, to avoid any multimode operation, the maximum power must be limited. The insertion of a photorefractive crys-tal in the resonator creates an adaptive spectral filter that makes it possible to relax these con-straints. In this manuscript, we show and model the operation of such a system.
Firstly, we study the conditions that are required to guarantee a stable single-mode operation in absence of crystal. The nonlinear processes inducing wave mixing (spectral hole burning, carrier heating and carrier density pulsations) and thus mode coupling are studied and taken into account such as to model the mode-hop conditions.
Then, we model the photorefractive filter. Its principle of operation is as follows: the stand-ing-wave pattern of the mode is reproduced in the volume of the crystal as an index modulation that corresponds to a Bragg grating and acts like a spectral filter. A stabilization of the oscillating mode is obtained thanks to the combined effect of this adaptive filter and the passive filtering of the ex-tended cavity (Littman-mounted grating).
Afterward, we present the improvements achieved by use of this self-organizing filtering technique. In experiments, we show that, thanks to an effective prevention of mode-hops and mul-timode operations, a stable single-mode oscillation can be maintained at powers higher than those reachable in absence of crystal. Finally, we confront measurements with modeling of the self-organizing cavity where the mode-coupling phenomena and the photorefractive filter are taken into account simultaneously.
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Contributor : Antoine Godard Connect in order to contact the contributor
Submitted on : Thursday, July 24, 2008 - 4:13:31 PM
Last modification on : Saturday, June 25, 2022 - 11:12:43 AM
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  • HAL Id : tel-00222084, version 1



Antoine Godard. STABILISATION D'UNE DIODE LASER ACCORDABLE PAR FILTRAGE AUTO-ORGANISABLE. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2003. Français. ⟨tel-00222084⟩



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