Abstract

Relaxation processes in Nd are studied. We find that resonance coupling between Nd and other rare earth ions seems to exist. Nd plus Yb in Na0.5Gd0.5WO4 results in a coupled system in which the Yb may be caused to fluoresce by pumping the Nd. Radiation trapping is found to play only a minor role.

© 1964 Optical Society of America

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