Abstract
In comparison to Ti3+-doped sapphire the fluorescence of Ti3+:YA103 is shifted into the orange—yellow spectral region with maximum at λem ~ 620 nm (see Fig. 1). This makes Ti:YAl2O3 very attractive as a tunable solid state laser thus extending the tuning range of Ti:YAl2O3 to shorter wavelengths. However, lasing of Ti:YAl2O3 was reported by only one research group in 1988 [1] and could not be reproduced until now. Later on it was shown, that excited state absorption (ESA) from the 2E-state of the Ti3+—ion to an unknown charge transfer state is decreasing the pumping efficiency strongly [2,3]. Because the strength of the ESA—transition depends on the crystal growth conditions, that is on the growth atmosphere and on codoping, it is believed, that the electron is not excited from the 2E-state into the conduction band but into a neighbouring defect centre. The aim of our work is now, to understand the structure of this complex centre and perhaps to prevent it by suitable crystal growth conditions. The presented photoconductivity measurements in connection with ESA data give us some information about the groundstate of the Ti3+–ion and the adjacent defect centre within the YAIO3 energy gap.
© 1993 Optical Society of America
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