Abstract
Electronic and vibrational absorption spectra of OH- and Cu + double doped NaF are studied and compared with the same respective single impurity doped host material. New ultraviolet and infrared absorption bands are found, which are supposed to be from a coupling effect of Cu + -OH - defects. The infrared vibrational absorption of the OH- fundamental stretching mode, for uncoupled and coupled defects, were measured using a color center laser, with X cavity configuration and 0.2cm -1 resolution. The observation of second harmonic absorption are analyzed and the ratio of overtone to fundamental reveals the existence of an electric anharmonicity in addition to the usual mechanical one observed in the Morse's potential model. Further measurements of thermally stimulated depolarization current indicate a permanent orientational freeze-in of the Cu + -OH - defect.
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