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Abstract
The propagation of nonequilibrium terahertz acoustic phonons in dense α-Al 2O 3 ceramics with grain size ∼ 10 μm was studied. Phonons were generated by the heat pulse technique and optical detection of 29 cm −1 (0.874 THz) phonons via the Cr 3+ impurity ions fluorescence was used. The diffusive propagation of phonons from heater to optical detector was observed with mean free path of phonons l ¯ = 150 μm which is significantly larger than the grain size. This value is in agreement with the result of computer calculation of l ¯ taking into account reflection and refraction at interfaces of disoriented α-Al 2O 3 single-crystalline grains in the framework of acoustic mismatch model.
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