[1] [1] Thibault F, Pelenc D, Druon F, et al. Efficient diode-pumped Yb3+:Y2 SiO5 and Yb3+:Lu2 SiO5 high-power femtosecond laser operation ［J］. Opt. Lett., 2006, 31(10): 1555-1557.

[2] [2] Liu Chengcheng, Wang Yonggang, Liu Jie, et al. Ultrafast Yb:Y2 SiO5 laser investigation based on a carbon nanotube absorber ［J］. Appl. Opt., 2011, 50(19): 3229-3232.

[4] [4] Chénais S, Balembois F, Druon F, et al. Thermal lensing in diode-pumped ytterbium lasers-Part I: Theoretical analysis and wavefront measurements ［J］. IEEE Journal of Quantum Electronics, 2004, 40(9): 1217-1234.

[5] [5] Chénais S, Balembois F, Druon F, et al. Thermal lensing in diode-pumped ytterbium lasers-Part II: Evaluation of quantum efficiencies and thermo-optic coefficients ［J］. IEEE Journal of Quantum Electronics, 2004, 40(9): 1235-1243.

[6] [6] Chenais S, Druon F, et al. On thermal effects in solid-state lasers: The case of ytterbium-doped materials ［J］. Progress in Quantum Electronics, 2006, 30: 89-153.

[11] [11] Niu Ronglian, Liu Jie, Liu Chengcheng, et al. Thermal lensing investigation in diode-pumped Yb:KY(WO4)2 lasers ［J］. Optik, 2011, 122: 1931-1934.

[13] [13] Cheniás S, Druon F, Balembois F, et al. Thermal lensing measurements in diode-pumped Yb-doped GdCOB, YCOB, YSO, YAG and KGW ［J］. Optical Materials, 2003, 22: 129-137.

[14] [14] Pfistner C, Weber R, Weber H P, et al. Thermal beam distortions in end-pumped Nd:YAG, Nd:GSGG, and Nd:YLF rods ［J］. IEEE J. Quantum Electron., 1994, 30(7): 1605-1615.