[1] J. Limpert, A. Liem, H. Zellmer, A. Tünnermann. Electron. Lett., 39, 645(2003).
[2] C. H. Liu, A. Galvanauskas, B. Ehlers, F. Doerfel, S. Heinemann, A. Carter, K. Tankala, J. Farroni. Proceedings of Advanced Solid-State Photonics, PDP17(2004).
[3] Y. Jeong, J. Sahu, D. Payne, J. Nilsson. Opt. Express, 12, 6088(2004).
[4] D. Gapontsev, I. P. G. Photonics. Proceedings of Solid State and Diode Laser Technology Review(2008).
[5] Y. Miao, H. Zhang, H. Xiao, P. Zhou. Chin. Opt. Lett., 12, 091403(2014).
[6] J. Lin, L. Xu, S. Wang, H. Han. Chin. Opt. Lett., 12, 101402(2014).
[8] A. Wettera, M. Fauchera, M. Lovelady, F. Séguina. Proc. SPIE, 6453, 64530I(2007).
[9] F. Séguin, A. Wetter, L. Martineau, M. Faucher, C. Delisle, S. Caplette. Proc. SPIE, 6102, 61021N(2006).
[10] D. Noordegraaf, M. D. Maack, P. M. W. Skovgaard, J. Johansen, F. Becker, S. Belke, M. Blomqvist, J. Laegsgaard. Proc. SPIE, 7914, 79142L(2011).
[11] D. Yan, C. Li, L. Li, X. Liu. Proceedings of Laser and Tera-Hertz Science and Technology, MTh3A(2012).
[12] Y. Shamir, R. Zuitlin, Y. Sintov, M. Shtaif. Proceedings of Frontiers in Optics, FW6C(2012).
[13] D. J. DiGiovanni, A. J. Stentz. Tapered fiber bundles for coupling light into and out of cladding-pumped fiber devices. U.S. Patents(1999).
[14] B. Sévigny, P. Poirier, M. Faucher. Proc. SPIE, 7195, 719523(2009).
[15] T. A. Birks, Y. Li. J. Lightwave Technol., 10, 432(1992).
[16] J. Love, W. Henry. Electron. Lett., 22, 912(1986).
[17] A. E. Siegman. Proceedings of Diode Pumped Solid State Lasers, 17(1998).
[18] A. E. Siegman. Proc. SPIE, 1868, 2(1993).
[19] H. Li, X. Zhu, X. Ma, S. Li, C. Huang, J. Zhang, W. Chen. Chin. Opt. Lett., 12, 091401(2014).