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CORRELATION OF THE ORBACH RELAXATION COEFFICIENT WITH OPTICAL LINEWIDTHS: LaF$sub 3$:Er$sup 3$$sup +$

William M. Yen, W. C. Scott, P. L. Scott

Published Jan 1, 1964• 0 citations
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CORRELATION OF THE ORBACH RELAXATION COEFFICIENT WITH OPTICAL LINEWIDTHS: LaFsub3sub 3sub3:Ersup3sup 3sup3sup+sup +sup+
We have employed a purely optical method to measure spin-lattice relaxation in the lower excited (4)S(3/2) state of Er(3+) in LaF(3) at helium temperatures. Above 3 K the relaxation is dominated by an Orbach process through the upper (4)S(3/2) state. Below 3 K the relaxation is caused by some residual mechanism that obscures the Kramers-Van Vleck direct process. By relating the Orbach relaxation measurements to the homogeneous broadening of the upper (4)S(3/2) level, we determine values of the transition rates between the upper and lower (4)S(3/2) states.