[1] E. Borisova, T. Uzunov, and L. Avramov, Lasers Med. Sci. 21, 34 (2006).

[2] A. Dube, K. Jayasankar, L. Prabakaran, V. Kumar, and P. K. Gupta, Lasers Med. Sci. 19, 52 (2004).

[3] Y. Bi, Y. Feng, H. Gong, H. Zhang, and Z. Xu, Chin. Opt. Lett. 1, 91 (2003).

[4] Y.-L. Jia, J.-L. He, H.-T. Wang, S.-N. Zhu, and Y.-Y. Zhu, Chin. Phys. Lett. 18, 1589 (2001).

[5] H. Kitano, T. Matsui, K. Sato, N. Ushiyama, M. Yoshimura, Y. Mori, and T. Sasaki, Opt. Lett. 28, 263 (2003).

[6] H. Ogilvy and J. A. Piper, Opt. Express 13, 9465 (2005).

[7] G. J. Kintz and T. Baer, IEEE J. Quantum Electron. 26, 1457 (1990).

[8] A. W. Tucker, M. Birnbaum, C. L. Fincher, and J. W. Erler, J. Appl. Phys. 48, 4907 (1977).

[9] A. Di Lieto, P. Minguzzi, A. Pirastu, S. Sanguinetti, and V. Magni, Appl. Phys. B 75, 463 (2002).

[10] A. Di Lieto, P. Minguzzi, A. Pirastu, and V. Magni, IEEE J. Quantum Electron. 39, 903 (2003).

[11] A. Agnesi, G. C. Reali, and P. G. Gobbi, IEEE J. Quantum Electron. 34, 1297 (1998).

[12] C. Du, S. Ruan, Y. Yu, and F. Zeng, Opt. Express 13, 2013 (2005).

[13] A.-Y. Yao, W. Hou, X.-C. Lin, Y. Bi, R.-N. Li, D.-F. Cui, and Z.-Y. Xu, Opt. Commun. 231, 413 (2004).

[14] H. Ogilvy, M. J. Withford, P. Dekker, and J. A. Piper, Opt. Express 11, 2411 (2003).