[1] Siegman A E. New developments in laser resonators.Proc SPIE, 1990,1224:2～14

[2] Weber H. Some historical and technical aspects of beam quality.Opt & Quant Electron,1992,24(9):S861～ S864

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

[4] Bélanger P, Champagne Y, Paré C. Beam propagation factor of diffracted laser beams.Opt Commun,1994,105(1):233～242

[6] Born M, Wolf E. Principles of Optics, seventh (expanded) edition. Cambridge: Cambridge University, 1999, Chapter VIII