We demonstrate locking of a high power broad area laser diode to a single frequency using holographic feedback from a photorefractive polymer thin-film device for the first time. A four-wave mixing setup is used to generate feedback for the broad area diode at the wavelength of the single frequency source (Ti:Sapphire laser) while the spatial distribution adapts to the preferred profile of the broad area diode. The result is an injection-locked broad area diode emitting with a linewidth comparable to the Ti:Sapphire laser.
van Voorst, P. D., de Wit, M. R., Offerhaus, H. L., Tay, S., Thomas, J., Peyghambarian, N., & Boller, K. J. (2007). Holographic injection-locking of a broad-area laser diode via a photorefractive thin film device. Optics express, 15(26), 17587-17591. https://doi.org/10.1364/OE.15.017587