[1] [1] DU X W. Factors for evaluating beam quality of a real high power laser on the target surface in far field ［J］. Chinese Chinese Journal of Laser, 1997, 24(4):327-332. (in Chinese)

[2] [2] ZUO T ZH. Manufacturing Laser-optical Beam quality, Transmission Quality and Focus Quality ［M］. Beijing:Science Press, 2008:7-23.(in Chinese)

[3] [3] GUO R H,LI D J,YANG G L, et al.. Design and experiment of unstable resonator for high-power TEA CO2 laser ［J］. Chinese Journal of Optics and Applied Optics, 2009,2(3):253-257. (in Chinese)

[4] [4] GUO R H,ZHANG L M,YANY G L, et al.. High power pulsed TEA CO2 laser with unstable resonator［J］. Chinese Journal of Lasers, 2009,36(s1):82-85. (in Chinese)

[5] [5] WU H P. Evaluation and applied analysis of laser beam quality ［J］. Opt. Precision Eng., 2000，8(2)：128-132. (in Chinese)

[6] [6] WANG S W,GUO L H,LI Y,et al.. Far-field beam quality of high-power unstable resonators TEA CO2 laser ［J］. Chinese Journal of Lasers, 2009,36(s2):14-17. (in Chinese)

[7] [7] WANG S W,GUO L H,ZHAO SH, et al.. Experiments of high-power CO2 laser disturbance to far-field HgCdTe detectors ［J］. Opt. Precision Eng., 2010,18(4):798-804. (in Chinese)

[8] [8] LI D J,YANG G L,XIE J J, et al.. Experiments of second harmonic generation of 9.3 μm pulsed CO2 lasers ［J］. Opt. Precision Eng., 2009,17(11):2684-2691. (in Chinese)

[9] [9] LUO SH R, L B D, HUANG L. The far-field intensity distribution and beam quality of unstable resonators ［J］. Laser Technology, 1999,23(5):281-284. (in Chinese)

[10] [10] YANG F, YU W F, CHEN J Y, et al.. Beam quality of TEA CO2 lasers with coaxial output unstable resonators ［J］. Laser Technology, 2008,32(3):314-316. (in Chinese)

[11] [11] 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)

[12] [12] BORN M, WOLF E. Principles of Optics［M］. 5th ed.Oxford: Pergmon Press, 1975:362-368.