[1] Y.-F. Chen, T.-M. Huang, C.-L. Wang, and L.-J. Lee, Appl. Opt. 37, 5727 (1998).

[2] C. Czeranowsky, E. Heumann, and G. Huber, Opt. Lett. 28, 432 (2003).

[3] Z. Sum, K. Li, Y. Bi, X. Yang, Y. Bo, Y. Zhang, G. Wang, W. Zhao, H. Zhang, W. Hou, D. Cui, and Z. Xu, Opt Commun. 241, 167 (2004).

[4] M. B. Danailov and P. Apai, Appl. Phys. 75, 8240 (1994).

[5] P. H. Chiu, A. Magana, and J. Davis, Opt. Lett. 19, 2116 (1994).

[6] H. Moosmuller and J. D. Vance, Opt. Lett. 22, 1135 (1997).

[7] Y. Lu, H. Tan, and L. Qian, Chin. Opt. Lett. 4, 25 (2006).

[8] J. Lu, J. Lu, T. Murai, K. Takaichi, T. Uematsu, J. Xu, and K. Ueda, Opt. Lett. 27, 1120 (2002).

[9] A. Geng, Y. Bo, X. Yang, H. Li, Z. Sun, Q. Peng, X. Wang, G. Wang, D. Cui, and Z. Xu, Opt. Commun. 255, 248 (2005).

[10] S. Singh, R. G. Smith, and L. G. Van, Phys. Rev. B 10, 2566 (1974).

[11] SNLO, free software for modeling nonlinear frequency conversion processes in nonlinear crystals, http://www.sandia.gov/imrl/X1118/xxtal.htm.