The optical beam emitted by a high power laser has been studied. The beam cross section at various locations is considered, from optical and photometrical points of view. Output wavefront shaping is deduced as well as some ideas about focusing devices.
J. de Metz, A. Terneaud, and P. Veyrie, "Etude optique du faisceau émis par un laser de grande intensité," Appl. Opt. 5, 819-819 (1966)