Commercial extended-cavity semiconductor laser can be tuned over 100 nm around 1.55 |?m. 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 AmericaPDF Article