Persistent Spectral Hole-Burning: Science and Applications

Almost fifteen years have now elapsed since the first observations of per­ sistent spectral hole-burning in inhomogeneously broadened absorption lines in solids. The fact that the spectral shape of an inhomogeneously broadened line can be locally modified for long periods of time has led to a large number of investigations of low-temperature photophysics and photochemistry that would not have been...