Abstract
The results of acoustooptic measurements of the attenuation coefficient of longitudinal ultrasonic waves in copper halide photochromic glasses are presented for wide temperature (140–550 K) and frequency (190–790 MHz) ranges. In the low-temperature region (T < 230 K), a wide relaxational peak is observed at a frequency of 629 MHz. Presumably, this peak is related to the motion of copper ions in the glass lattice. In the high-temperature region (up to 550 K), the attenuation coefficient does not depend on temperature. The presence of the temperature plateau is explained in the framework of the two-level system model with weak asymmetry.
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