The self-focusing phenomenon of powerful Gaussian CO2-laser beams in collisional plasmas is analyzed using a new technique based on geometrical optics. The problem of self-focusing is reduced to a nonlinear differential equation in the beamwidth parameter, which is then numerically solved by using a computational technique and assuming that the laser beam and the plasma are either coupled or decoupled along the propagation path. The beamwidth parameter is, in general, a function of propagation distance, radial position, collisional-energy-loss to conduction-energy-loss ratio, initial beamwidth, laser power, and electron concentration to its critical-concentration ratio. The effect of variation of each of these parameters on the variation of the beamwidth parameter is investigated.
© 1982 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
Appl. Opt. 16(7) 1975-1981 (1977)
J. Opt. Soc. Am. 65(8) 882-886 (1975)
Zhili Lin, Xudong Chen, Panfeng Ding, Weibin Qiu, and Jixiong Pu
Opt. Express 25(7) 8440-8449 (2017)