Abstract
Spectroscopic properties and excited-state absorption (ESA) of Ti3+ doped YAlO3 are investigated in detail. The fluorescence band is centered at 623 nm with a room-temperature lifetime of 11.4 μs and a quantum efficiency nearby one. Till now laser action could not be detected because of strong excited-state absorption into a charge transfer band located 45 500 cm−1 above the Ti3+ ground state. At the Ar-laser pump wavelength the ESA cross-section is determined to be σESA=1×10−18 cm2. This value is a factor of 44 higher than the ground-state absorption cross-section. Consequently the pumping efficiency is decreased by one or two orders of magnitude. The Ti:YAlO3 results are compared with the spectroscopic data of Ti:Al2O3.
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Dedicated to Prof. Dr. Herbert Welling on the occasion of his 60th birthday