[1] [1] B. He, Q. Lou, J. Zhou, J. Dong, Y. Wei, D. Xue, Y. Qi, Z. Su, L. Li, and F. Zhang, Opt. Express 14, 2721 (2006).

[2] [2] S. Saraf, S. Sinha, A. K. Sridharan, and R. L. Byer, in Proceedings of Advanced Solid-State Photonics (OSA) 83, 426 (2003).

[3] [3] X. Liu, S. Du, J. Zhou, J. Dong, Y. Wei, Z. Yuan, W. Wang, Z. Su, and Q. Lou, Chin. Opt. Lett. 8, 184 (2010).

[4] [4] J. Wang, J. Zhou, H. Zang, X. Zhu, and W. Chen, Chin. Opt. Lett. 8, 670 (2010).

[5] [5] A. Liem, J. Limpert, H. Zellmer, and T. Tunnermann, Opt. Lett. 28, 1537 (2003).

[6] [6] Y. Jeong, J. Nilsson, J. K. Sahu, D. N. Payne, R. Horley, L. M. B. Hickey, and P. W. Turner, IEEE Sel. Top. Quantum Electron. 13, 546 (2007).

[7] [7] N. A. Brilliant, J. Opt. Soc. Am. B 19, 2551 (2002).

[8] [8] A. Liu, Opt. Express 17, 15201 (2009).

[9] [9] A. Kosterin, V. Temyanko, M. Fallahi, and M. Mansuripur, Appl. Opt. 43, 3893 (2004).

[10] [10] D. Machewirth, F. Corbin, K. Tankala, M. O’Conner, B. Samson, and M. Alam, in Proceedings of 19th Solid State and Diode Laser Technology Review FIBER2-2 (2006).

[11] [11] Y. Jeong, J. Nilsson, J. K. Sahu, D. B. Soh, P. Dupriez, C. A. Codemard, S. Baek, D. N. Payne, R. Horley, J. A. Alvarez-Chavez, and P. W. Turner, Opt. Lett. 30, 955 (2005).

[12] [12] Y. A. Barannikov, A. I. Oussov, F. V. Shcherbina, and N. S. Platonov, in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies (OSA) CMS3 (2004).

[13] [13] W. H. Loh, B. N. Samson, L. Dong, G. J. Cowle, and K. Hsu, J. Lightwave Technol. 16, 114 (1998).

[14] [14] M. Leigh, W. Shi, J. Zong, J. Wang, S. Jiang, and N. Peyghambarian, Opt. Lett. 32, 897 (2007).