[1] [1] SIEGMAN A E. New development in laser resonators［J］. SPIE, 1990,1224:2-20.

[2] [2] ANTHOY E. SIEGMAN S W. Output beam propagation and beam quality from a multimode stable-cavity laser［J］. IEEE Journal of Quantum Electronics, 1993,29(4):1212-1217.

[3] [3] WRIGHT D,GREVE P,FLEISCHER J,et al.. Laser beam width, divergence and beam propagation factor-an international standardization approach ［J］. Optical and Quantum Electronics, 1992,24:993-1000.

[4] [4] JOHNSTON T F. M2 concept characterizes beam quality ［J］. Laser Focus World, 1990,26(2):173-183.

[5] [5] LV B D. Analyzing some problems of laser beam quality［J］. Laser Technology, 1998,22(1):14-17.(in Chinese)

[6] [6] WU H P. Evaluation and applied analysis of laser beam quality ［J］. Opt. Precision Eng., 2000,8(2):128-132.(in Chinese)

[7] [7] GAO W. Definition of laser beam quality β factor［J］. ACTA Photonica Sinica, 2003,23(9):1038-1040.(in Chinese)

[8] [8] LIU Z J, LU Q SH, ZHAO Y J. Study of evaluating beam quality of high energy lasers with unstable resonators［J］. Chinese Journal of Lasers, 1998,25(3):193-196.(in Chinese)

[9] [9] GAO A H, LU ZH G. Spatial coherence and evaluation of space quality on laser beam［J］. ACTA Photonica Sinica, 1998,27(12):1125-1128.(in Chinese)

[10] [10] SEAN R T,LATHAM W P. Appropiate measures and consistent standard for high energy laser beam quality［J］. Journal of Directed Energy, 2006,2:22-58.

[11] [11] ISO11145:2001, Optics and optical instruments-Lasers and laser-related equipment-Vocabulary and symbols: 5-18.

[12] [12] IEC60825:2007, Safety of laser products-Part I: Equipment classification and requirements:18-21.

[13] [13] ISO11146:1999. Lasers and laser-related equipments—Test methods for laser beam parameters—Beam widths, divergence angle and beam propagation factor: 1-10.