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Crystal-Field Effects on Ti3+ Viability as a Laser Material

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Abstract

Optical spectroscopy and single pass gain and loss measurements in yttrium aluminate (YAlO3), yttrium aluminum garnet (YAG), gadolinium scandium aluminum garnet (GSAG), and sapphire (A12O3) indicate that usefulness of Ti3+ as a lasing ion may be limited to a narrow range of crystal field strengths. Experimental results indicate that low crystal field materials such as GSAG and YAG exhibit high nonradiative relaxation rates which could make lasing very inefficient. High crystal field materials such as YAl03 appear to be wrought with several loss mechanisms such as excited state absorption (ESA) and color center effects. Unless improved growth techniques can remove the losses observed in YAlO3, the overall prospect for developing Ti3+ lasers from this material remain dim.

© 1990 Optical Society of America

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