Abstract
Persistent spectral hole burning (PSHB) is demonstrated in the optical transition of doped into crystals of BaFCl. For ions at two different lattice sites, persistent holes can be burned at temperatures below 77 K. The characteristics of the hole-burning process suggest that the observed PSHB effect is due to laser-excitation-induced site-to-site conversion. One type of site is converted into another type of defect site. This process is not optically reversible, and holes can be erased only when the temperature increases to 150 K.
© 1999 Optical Society of America
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