[1] [1] Y. Jeong, C. Alegria, J. K. Sahu, L. Fu, M. Ibsen, C. Codemard, et al., “A 43-W C-band tunable narrow-linewidth erbium-ytterbium co-doped large-core fiber laser,” IEEE Photon. Technol. Lett., vol. 16, no. 3, pp. 756–758, Mar. 2004.

[2] [2] J. K. Sahu, Y. Jeong, C. Codemard, J. Nilsson, M. R. Mokhtar, M. Ibsen, et al., “Tunable narrow linewidth high power erbium:ytterbium co-doped fiber laser,” in Proc. CLEO, 2004, p. CMK1.

[3] [3] Y. Feng, L. R. Tylor, and D. B. Calia, “150 W highly-efficient Raman fiber laser,” Opt. Exp., vol. 17, no. 26, pp. 23678–23683, 2009.

[4] [4] P. Jelger, P. Wang, J. K. Sahu, F. Laurell, and W. A. Clarkson, “Highpower linearly-polarized operation of a cladding-pumped Yb fibre laser using a volume Bragg grating for wavelength selection,” Opt. Exp., vol. 16, pp. 9507–9512, 2008.

[5] [5] J. W. Kim, P. Jelger, J. K. Sahu, F. Laurell, and W. A. Clarkson, “Highpower and wavelength-tunable operation of an Er,Yb fiber laser using a volume Bragg grating,” Opt. Lett., vol. 33, no. 11, pp. 1204–1206, 2008.

[6] [6] J. Liu, D. Y. Shen, H. T. Huang, X. Q. Zhang, X. Liu, and D. Y. Fan, “Volume Bragg grating-based high power Er,Yb fiber laser covering the whole C- and L-band,” IEEE Photon. Technol. Lett., vol. 25, no. 15, pp. 1488–1491, Aug. 2013.

[7] [7] F. Wang, D. Y. Shen, D. Y. Fan, and Q. S. Lu, “Spectrum narrowing of high power Tm: Fiber laser using a volume Bragg grating,” Opt. Exp., vol. 18, no. 9, pp. 8937–8941, 2010.

[8] [8] T. S. McComb, R. A. Sims, C. C. C. Willis, P. Kadwani, V. Sudesh, L. Shah, et al., “High-power widely tunable thulium fiber lasers,” Appl. Opt., vol. 49, no. 32, pp. 6236–6242, 2010.

[9] [9] F. Wang, D. Y. Shen, D. Y. Fan, and Q. S. Lu, “Spectral narrowing of cladding-pumped high power Tm-doped fiber laser using a volume Bragg grating-pair,” Appl. Phys. Exp., vol. 3, pp. 112701-1–112701-3, Oct. 2010.

[10] [10] P. Jelger, V. Pasiskevicius, and F. Laurell, “Narrow linewidth high outputcoupling dual VBG-locked Yb-doped fiber laser,” Opt. Exp., vol. 18, no. 5, pp. 4980–4985, 2010.

[11] [11] F. Havermeyer, W. Liu, D. Psaltis, and G. J. Stechman, “Volume holographic grating-based continuously tunable optical filter,” Opt. Eng., vol. 43, no. 9, pp. 2017–2021, 2004.