| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of generating a ring beam synthesized using a cylindrical light conductive body. SOLUTION: A cylindrical rod 1 provided with its end faces of which an incident end face and an emitting end face are roughly vertical to an optical axis respectively is prepared. Then, coherent light sources are arranged by a specified method so that plural incident light beamsΦ1, 2, 3...n are tilted against the optical axis and can be introduced on the incident end face 10 at a same incident angleθin. Then, incident light beamsΦ1, 2, 3...n are made incident on the incident end face 10 of the cylindrical rod 1. Then, inside the rod 1, light beams are each wave-guided keeping an angleθN and each of the incident light beamsΦ1, 2, 3...n made incident at the incident angleθin emits the light flux at a same emitting angleθout. As the result, a synthetic ring beam L composed from a single annular light beam in which plural emitting optical fluxes are synthesized is formed on a virtual flat plane P vertical to the optical axis A.
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