| 摘要 |
PURPOSE: To make phase distribution uniform so that it may be considered to be a spherical wave emitted from a certain point, by designing second and third total reflection mirrors so that the virtual image of a center circle at the center of the beam waist of a laser beam being in the ring cylindrical part in a laser medium gathers at a point near above the central axis of the laser medium. CONSTITUTION: A total reflection mirror parts of whose conical surface are the surfaces of total reflection mirrors 3 and 4 is thought of. On this occasion, beams emitted from wave directing path ends 24 and 25 and reflected by the total reflection mirrors 3 and 4 can be considered to be beams emitted from a virtual image 26 at the upper part of a wave directing path end and that 27 at the lower part of the wave directing path end. At this time, it is possible to make the center coincide with the end surfaces of the virtual images 26 and 27 by adjusting the angles of the total reflection mirrors 3 and 4. When design is done in this way, it is possible to treat a beam emitted from the end of a circular wave directing path equally with one emitted from a certain point effectively. Namely, its wave surface is considered to be a spherical wave, and can be made uniform. |
