A STUDY OF OPTICAL ABSORPTION SPECTROSCOPY FROM METASTABLE EXCITED STATES OF TRANSITION METALS IONS IN CRYSTALS.
Abstract
The research was primarily concerned with the energy levels of ions in crystals. In particular, the use of techniques involving absorption from excited states were explored. These techniques are useful in two ways. First, due to selection rules many excited states cannot be observed by absorption transitions from the ground state but are observable from metastable excited states. Thus there are large numbers of non-fluorescing levels which can be measured only in this way. This is of special importance in laser materials where absorption from the upper state will decrease the gain. Secondly, there are many infrared levels of ions in crystals which are especially difficult to study. Not only are infrared techniques less sensitive, but the spontaneous emission rate decreases. Thus, absorption from these levels is the best way to measure the lifetimes of these levels, monitor energy transfer, etc. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1969
- Accession Number
- AD0690211
Entities
People
- H. W. Moos
Organizations
- Johns Hopkins University