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The origin of excited-state absorption (ESA) that plagues the performance of Ti:YAlO3 as a laser material is discussed. It is proposed that two populations of Ti3+ exist in YAlO3. Those that have a lower photoionization threshold have to be eliminated to prevent the ESA from affecting lasing.
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W. C. Wong, T. Danger, Guenter Huber, Klaus Petermann, "Ti:YAlO3 vibronic transition: can lase or cannot?," Proc. SPIE 3176, Tunable Solid State Lasers, (1 November 1997); https://doi.org/10.1117/12.293429