MANUFACTURE OF FIBER GRATING AND APPARATUS FOR MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To efficiently manufacture a long-sized fiber grating having high quality. SOLUTION: An optical fiber 2 is installed on a moving stage 1 movable in a direction perpendicular to the plane of the figure. A phase mask 3 is arranged on this optical fiber 2. A UV beam 6 outputted from a UV laser beam source 5 is introduced via reflection mirrors 7a, 7b, a beam expander 8 and a slit 9 to a moving mirror 10. The UV beam 6 reflected by the moving mirror 10 is cast to the core of the optical fiber 2 through a columnar lens 11 and a phase mask 3. At the time of irradiation, the moving mirror 10 is scanned in the longitudinal direction of the optical fiber 2. At this time, the intensity of the visible light generated by the irradiation with the UV rays is detected by a power meter 4 connected to the one side of the optical fiber 2. The moving position of the moving stage 1 is so adjusted that the detected light intensity is always kept max. (constant).