Propagation of ultrasonic beams in paratellurite crystal

被引:12
|
作者
Belyi, VN [1 ]
Kazak, NS [1 ]
Pavlenko, VK [1 ]
Katranji, EG [1 ]
Kurilkina, SN [1 ]
机构
[1] Natl Acad Sci Belarus, BI Stepanov Phys Inst, Minsk 220072, BELARUS
关键词
beam divergence; focusing; non-diffraction propagation; ultrasonic beams;
D O I
10.1016/S0041-624X(99)00013-X
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Analytical expressions have been obtained of the main curvatures of the concavity of the wave vector surface, corresponding to the quasi-transverse wave, versus anisotropy parameter C = C-11 - C-26 - 2C(66) of the paratellurite crystal. Changes in the form of the sound beam on scanning in the direction of its propagation in the (001) and (1 (1) over bar 0) planes have been investigated. It has been found that near the acoustic axis lying in (001) considerable transformation of the beam takes place; initially extended, it becomes squeezed along the [001] axis. The conditions for focusing and channelling of ultrasound radiation have been determined. The propagation directions at which anisotropy of the paratellurite crystal does not influence the beam divergence have been found. It is shown that, for a wide range of deviation angles theta of the wave normal from the [001] axis in the symmetry plane (1 (1) over bar 0) (theta less than or equal to 50 degrees), the presence of anisotropy leads to weaker diffraction broadening. The character of variation in the direction and divergence of the sound beam on scanning in the vicinity of the [110] direction has been studied experimentally. (C) 1999 Elsevier Science B.V. All rights reserved.
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页码:377 / 383
页数:7
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