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Stabilization of a 1.55-μm extended-cavity semiconductor laser by intra-cavity dynamic holography

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Commercial extended-cavity semiconductor laser can be tuned over 100 nm around 1.55 μm. This continuous tuning with no mode-hopping requires delicate factory adjustments and a high mechanical stability. We demonstrate that these constrains are relaxed by the insertion of a photorefractive crystal inside the cavity: the hologram recorded by the oscillating mode plays the role of an adaptive filter which stabilizes this oscillating mode. We achieved the experimental demonstration of the self-stabilization using a CdTe photorefractive crystal. Performing a numerical calculation, we also anticipated the further stability increase which could be obtained with optimized photorefractive crystals.

© 2001 Optical Society of America

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