Abstract

In this paper time resolved infrared spectroscopy of small impurities in crystals is presented. Optical pumping into the fundamental or overtone absorption results in vibrational emission of several molecular species in solid hosts, Van der Waals-type or ionic crystals. Vibrational relaxation in solids is also probed by infrared double resonance which is a more appropriate technique for short lived systems. Line narrowing techniques involving site selection by a narrow band laser are employed in both molecular and ionic systems. IR time resolved hole burning experiments very similar to those performed in optical spectroscopy of luminescent ions in insulators have become feasible. Coherent transient spectroscopy is also very promising.

© 1984 Optical Society of America