[1] S. Zhen, R. Liu, B. Yu, J. Zhang, and B. Han, Chin. Opt. Lett. 7, 26 (2009).

[2] J Ning, W. Zhang, L. Shang, G. Fan, Q. Han, and L. Zhou, Chinese J. Lasers (in Chinese) 35, 483 (2008).

[3] C. Gao, W. Zhao, Y.Wang, and S. Zhu, Chinese J. Lasers (in Chinese) 35, 651 (2008).

[4] W. P. Risk, R. C. Youngquist, G. S. Kino, and H. J. Shaw, Opt. Lett. 9,309(1984).

[5] M. P. Roe, B. Wacogne, and C. N. Pannell, IEEE Photon. Technol. Lett. 8,1026(1996).

[6] P. A. Greenhalgh, A. P. Foord, and P. A. Davies, Electron. Lett. 25, 1206(1989).

[7] J. O. Askautrud and H. E. Engan, Opt. Lett. 15, 649(1990).

[8] S. R. M. Carneiro, E. A. Castro, O. Lisb^oa, and S. L. A. Carrara, Opt. Lett. 17, 831 (1992).

[9] D. B. Patterson, A. A. Godil, G. S. Kino, and B. T. Khuri-Yakub, Opt. Lett. 14, 248 (1989).

[10] W. P. Risk, G. S. Kino, and H. J. Shaw, Opt. Lett. 11, 115(1986).

[11] B. Liao, Q. Zhao, and Y. Zhang, Opt. Commun. 242, 361(2004).

[12] I. C. Chang, IEEE Trans. Sonics Ultrason. 23, 2(1976).

[13] J. Xu and R. Stroud, Acousto-Optic Devices: Principles, Design, and Applications (Wiley, New York, 1992).

[14] L. Zhao, Q. Zhao, L. Liu, and B. Liao, Proc. SPIE 5644, 21(2005).

[15] D. L. Hecht, IEEE Trans. Sonics Ultrason. 24, 7(1977).

[16] R. V. Schmidt, IEEE Trans. Sonics Ultrason. 23, 22(1976).

[17] E. G. H. Lean, J. M. White, and C. D. W. Wilkinson, Proc. IEEE 64, 779(1976).

[18] J. M. White, P. F. Heidrich, and E. G. Lean, Electron. Lett. 10, 510(1974).

[19] C. S. Tsai, Le T. Nguyen, S. K. Yao, and M. A. Alhaider, Appl. Phys. Lett. 26,140(1975).