FINAL SCIENTIFIC REPORT On ELECTRONIC RAMAN EFFECT IN GARNETS, TUNABLE INFRARED LASERS, AND QUANTUM COUNTERS

摘要

Since the inception of the grant, we have been applying the Raman technique to study some basic properties of rare-earth garnets, as well as performing preliminary investigations on a tunable IR quantum counter and Ho:YIG laser. Using Raman scattering, the following were determined:(1) the phonon energy and symmetry assignments of numerous garnets (YA1G, DyAlG, YbAlG, LuAlG, YGaG, DyGaG, YbGaG, LuGaG, YIG, DylG, ErIB, and YbIG); (2) the energy of the lower crystal-field levels (10-4000 cm ) in YbAlG, YbGaG, DyAlG, DyGaG, and ErIG; (3) the dipole and exchangefield splitting of several electronic levels for DyAlG below its Neel temperature; and (4) the accuracy of the crystal-field parameters by comparing the calculated with the observed Raman intensity.