Search for Far Infrared Radiation from Optically Pumped Defect Modes
Final technical rept. 3 Sep 1979-31 Dec 1982
CORNELL UNIV ITHACA NY LAB OF ATOMIC AND SOLID STATE PHYSICS
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The vibrational relaxation dynamics of a spherical top molecule embedded in alkali halide crystals have been investigated under conditions of non-equilibrium IR laser excitation. Incoherent laser saturation and high resolution hole burning spectroscopy have been used to measure the anharmonic decay of the excited vibrational state. In addition persistent IR spectral holes with lifetimes greater than 10 minutes at 1.4 degrees K have been observed, indicating for the first time the presence of ground state optical pumping processes for a high symmetry impurity in a cubic lattice. Our discoveries of long-lived vibrational modes in alkali halide crystals points to a new avenue of research on the physics of solids and also supports the premise that IR optical pumping can occur in the vibrational mode spectrum of a solid.
- Lasers and Masers