This work was supported in part by the National Science Foundation.
Lasers -- Research, Lasers -- Mathematical models, Gaussian beams
A new radial focusing device is described that condenses an incident laser beam to an extremely intense and uniformly illuminated focal spot. The focal region is useful for many applications. When used with a 10.6-µm CO₂ TEA laser source, a disk-shaped air-breakdown spark results, and the properties of this spark have been investigated.
Lee W. Casperson and Mohammad S. Shekhani, "Air Breakdown in a Radial-Mode Focusing Element," Appl. Opt. 13, 104-108 (1974).