Peripheral laser for maintaining current conducting plasma filament, has central tube connecting parabolic mirror to transmission mirror, and including inner face constituted of reflecting material, where mirrors have rim or ring shape

摘要

The peripheral laser has a hollow and rectilinear central tube (3) traversing center of a resonant cavity (6). A stern wave from a central laser passes via the tube, where intensity of peripheral laser is higher than that of the central laser. The tube connects a parabolic mirror (4) to a transmission mirror (5), and has an inner face constituted of reflecting material, where the mirrors have rim or ring shape.