[1] [1] J. Limpert, A. Liem, and H. Zellmer, Electron. Lett. 39, 645 (2003).

[2] [2] H. Sekiguchi, K. Ito, A. Tanaka, H. Yamaura, H. Kan, and K. Ueda, Rev. Laser Eng. 31, 525 (2003).

[3] [3] O. Andrusyak, V. Smirnov, G. Venus, and L. Glebov, Opt. Commun. 282, 2560 (2009).

[4] [4] J. Limpert, F. R¨oser, T. Schreiber, and A. T¨unnermann, IEEE J. Sel. Top. Quantum Electron. 12, 233 (2006).

[5] [5] V. Daneu, A. Sanchez, T. Y. Fan, H. K. Choi, G. W. Turner, and C. C. Cook, Opt. Lett. 25, 405 (2000).

[6] [6] B. Xiong, X. Yuan, X. Zhang, J. Feng, G. Zhang, and K. Zou, Acta Opt. Sin. 32, 124 (2012).

[7] [7] I. V. Ciapurin, L. B. Glebov, and V. I. Smirnov, Proc. SPIE 5742, 183 (2005).

[8] [8] I. Ciapurin, V. Smirnov, G. Venus, L. Glebova, E. Rotari, and L. Glebov, in Proceedings of CLEO/IQEC CTuP51 (2004).

[9] [9] L. B. Glebov, in Proceedings of Solid State and Diode Lasers Technical Review FA-5 (2001).

[10] [10] I. V. Ciapurin, L. B. Glebov, and C. M. Stickley, in Proceedings of Solid State and Diode Lasers Technical Review HPFIB4 (2002).

[11] [11] I. V. Ciapurin, L. B. Glebov, and V. I. Smirnov, Proc. SPIE 5335, 116 (2004).

[12] [12] O. Andrusyak, I. Ciapurin, V. Smirnov, G. Venus, and L. Glebov, Proc. SPIE 6453, 64531 L1 (2007).

[13] [13] O. Andrusyak, I. Ciapurin, V. Smirnov, G. Venus, N. Vorobiev, and L. Glebov, Proc. SPIE 6873, 687314 (2008).

[14] [14] A. Jain, D. Drachenberg, O. Andrusyak, G. Venus, V. Smirnov, and L. Glebov, Proc. SPIE 7686, 768615 (2010).

[15] [15] D.Drachenberg, I.Divliansky, V. Smirnov, G. Venus, and L. Glebov, in Proceedings of the European Conference on Lasers and Electro-Optics, Optical Society of America (2011).

[16] [16] K. Rawal, P. Sati, and M. Reddy, in Proceedings of the International Conference on Fiber Optics and Photonics, Optical Society of America (2012).

[17] [17] D. R. Drachenberg, O. Andrusyak, G. Venus, V. Smirnov, J. Lumeau, and L. B. Glebov, Appl. Opt. 52, 7233 (2013).

[18] [18] H. Kogelnik, Bell Syst. Technol. J. 48, 2909 (1969).

[19] [19] X. Zhang, X. Yuan, S. Wu, J. Feng, K. Zou, and G. Zhang, Opt. Lett. 36, 2167 (2011).