Abstract
Optical dephasing rates of a dilute concentration of ions in a pure silica fiber have been studied from 0.05 to 1.0 K with use of two-pulse photon echoes. Echoes obtained by resonant excitation of into the metastable state from the ground state have yielded at 0.1 K which follows a temperature dependence to 1.0 K. A crossover of to a temperature dependence above 1 K is inferred by comparison with earlier high-temperature linewidth measurements on this transition.
- Received 23 August 1983
DOI:https://doi.org/10.1103/PhysRevLett.51.2033
©1983 American Physical Society