[1] [1] C. Y. Wan, S. M. Liu, J. W. Zhou et al.. High repetition rate industrial TEA CO2 laser with output power of 1.5 KW. SPIE, 1995,2502:87～94

[2] [2] ISO/TC 172/SC9/WG1/N56, Optics and optical instruments: Test methods for laser beam parameters: Beam widths, divergence angle, and beam propagation factor. 1993-05-03

[3] [3] George N. Lawrence. Proposed international standard for laser-beam quality falls short. Laser Focus World, 1994, (7):109～110,112,114

[4] [4] A. E. Siegman, S. W. Townsend. Output beam propagation and beam quality from a multimode stable-cavity laser. IEEE J. Quantum Electron., 1993,29(4):1212～1217

[5] [5] C. Lim, W. M. Steen. Measurement of the temporal and spatial power distribution of a high-power CO2 laser beam. Optics and Laser Technology, 1982, 14(3):149～153

[7] [7] A. E. Siegman. Defining the effective radius of curvature for a nonideal optical beam. IEEE J. Quantum Electron., 1991, 27(5):1146～1148

[8] [8] A. E. Siegman. Lasers. University Science Books, California: Mill Valley, 1984. 648

[9] [9] Yao Jianquan. Nonlinear optical frequency conversion and laser frequency tuning technology. Beijing: Science Press, 1995. 648 (in Chinese)

[10] [10] A. E. Siegman. Lasers. University Science Books, California: Mill Valley, 1984. 694