Search for Far Infrared Radiation from Optically and Acoustically Pumped Defect Modes.
Final rept. 14 Feb 83-13 Feb 86,
CORNELL UNIV ITHACA NY LAB OF ATOMIC AND SOLID STATE PHYSICS
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More than one elastic ground state configuration has been found for both monatomic and polyatomic defects matrix isolated in alkali halide crystals. Multiple ground states give rise to persistent changes in the vibrational absorption spectrum of molecules when the internal vibrational modes of the defect are excited with a high resolution but tunable IR laser. The end result is that spectral holes with a width characteristic of the dephasing time of the vibrational mode can be created in the inhomogeneously strain broadened spectrum. The technique has been used to identify CN-Na, a new kind of vibrational defect which hole burns and also shows vibrational fluorescence in the IR. The discovery of the first solid state IR vibrational laser was a direct consequence of these kinds of measurements. The observations of transient and persistent hole burning, of vibrational fluorescence and of vibrational laser radiation demonstrate that diatomic molecules are more weakly coupled to the lattice than are polyatomics.
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