Single-mode output power enhancement of an extended cavity broad-area laser diode by an intracavity photorefractive crystal
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- Reboud, V., Dubreuil, N., Fournet, P. et al. Appl. Phys. B (2007) 87: 233. doi:10.1007/s00340-007-2603-0
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Brightness improvement of high-power semiconductor lasers can be achieved by placing a broad-area laser diode, used as a pure optical amplifier, in an extended cavity. We report the modal behavior of an extended cavity which contains a photorefractive crystal. The dynamic holographic medium that plays the role of a spatial and spectral filter acts on the transverse and axial structure of the extended cavity modes and improves the single-mode operating range of the laser. An enhancement of the brightness in single-mode operation by a factor of seven has been experimentally observed thanks to the intracavity photorefractive crystal.