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Abstract
Optical dephasing of the 5388 Å transition between the lowest Kramers doublets of the 4S 3 2 and 4I 15 2 multiplets of Er 3+:LaF 3 has been studied by photon echo, optical phase switching and optical free induction decay. Er 3+− 19F hyperfine interactions produce dephasing which is two orders of magnitude faster than in previously studied non-Kramers systems, but at high field changes in the spin dynamics result in microsecond dephasing. For the lower Zeeman component of 4S 3 2 , T 2 (=6μs) is independent of H 0 whereas for the upper component the dephasing is rapid and strongly field dependent. This is quantitatively accounted for by spin lattice relaxation of the upper component of 4S 3 2 . Below 20 kG concentration and temperature dependent dephasing due to electron spin diffusion is observed.
Published Version
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