[1] [1] HODGSON N, WEBER H.Laser resonators and beam propagation［M］.New York: Springer, 2005.

[2] [2] LI GEN, HUANG CHUYUN, TANG XIAHUI.Numericalresearch on the output beam quality of kW RF-excited slab CO2 laser［J］.Applied Laser, 2015(6): 713-717.

[3] [3] DU K.Picosecond laser with 400 W average power and 1 mJ pulse energy［J］.Proceedings of SPIE-The International Society for Optical Engineering, 2011, 7912(4): 1-6.

[4] [4] XIAO LONGSHENG, TANG XIAHUI, QIN YINGXIONG, et al.Shaping characteristics of output beam of 2 kW radio frequency slab CO2 laser［J］.Chinese Journal of Lasers, 2014, 41(4): 38-44.

[5] [5] WANG WEI, TANG XIAHUI, QIN YINGXIONG, et al.Influence of resonator mirror surfaces on output mode of radio frequency slab CO2 lasers［J］. Chinese Journal of Lasers, 2016(4): 21-27.

[6] [6] WANG W, QIN Y, XIAO Y, et al.Research on beam characteristics in a large-Fresnel-number unstable-waveguide hybrid resonator with parabolic mirrors［J］.Applied Optics, 2016, 55(21): 5497-5504.

[7] [7] BUSKE I, WITTROCK U.Diffraction analysis of aberrated laser resonators［J］.Applied Physics B, 2006, 83(2): 229-233.

[8] [8] SIEGMAN A E.Analysis of laser beam quality degradation caused by quartic phase aberrations［J］.Applied Optics, 1993, 32(30): 5893-5901.

[9] [9] LAPUCCI A, CIOFINI M.Numerical analysis of non-confocal configurations of a hybrid stable-unstable resonator［J］.Optics Communications, 2011, 284(4): 999-1003.

[10] [10] SIEGMAN A E.Lasers［M］.Calif.: Oxford University Press, 1986.

[11] [11] RIGROD W W.Saturation effects in high-gain lasers［M］.Journal of Applied Physics, 1965, 36(8): 2487-2490.