[1] [1] IEEE, 1969, QE-5, 345.

[2] [2] Optics and Laser Technology, 1973，5，148.

[4] [4] J. Appl. Phys., 1971, 42, 1031.

[5] [5] Proc. Ind. Acad. Sci. A, 1935, 2, 406～413; Proc. Ind. Acad. Sci. A, 1936, 3,75, 119.

[6] [6] Proc. Roy. Soc. Ser. A, 1953, 220, 356.

[9] [9] J. Appl. Phys., 1969, 8, 329.

[10] [10] Appl. Phys. Lett., 1966，8, 205.

[11] [11] J. Appl. Phys., 1967, 38, 5149.

[12] [12] Proc. IEEE，1973, 61, 1073.

[13] [13] Soc. Am., 1970, 48, 1086; IEEE, Trans. Ultrasonics and Sonics, 1967，SU-14，103.

[15] [15] AD 712977, 1970，9.

[16] [16] ЕEE, J., QE—9, 1973, 683.