Abstract
Single-crystal doped with has been grown successfully by use of the Czochralski technique. The absorption spectrum of the crystal was measured. The most intense line, centered at , was associated with the transition , and a novel and important result that corporate transition (co-transition) between and of in the region of was found and discussed. The mechanism that caused the phenomenon was explained by energy-level splitting theory. In the tetrahedral approximation, using the quantum and Tanaba–Sugano theories, Racah parameter B and crystal field parameter 10Dq were calculated. The optical energy gap, deduced to be , was lower than that of pure .
© 2006 Optical Society of America
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