Photorefractive crystals have been used for long to improve the characteristics of laser beams: their shapes, their longitudinal and transverse modal structures. In this communication we review the state of the art of the use of intra-cavity photorefractive self-adapted filters. In this approach, the main role of the adaptive photorefractive filter is to select the oscillating modes among the possible modes of the laser cavity without such a filter. We detail their specificities, and various filters and laser architectures to improve the spatial and longitudinal modal structures.

© 2007 Optical Society of America

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