Ti:Al2O3 has attracted particular attention during last several years for its promising properties as a widely tunable solid state laser in the near IR region. An interesting feature of Ti:Al2O3 is the additional absorption band in the laser oscillation wavelength region with the peak optical density at around 800nm. This has given a severe obstacle to the exploitation of efficient laser output. Although its origin still seems unknown, some possible mechanisms have been suggested1-4). According to previous works, cluster-like defects in the Ti:Al2O3 crystal are possibly responsible for it.

© 1987 Optical Society of America

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