Patent Number: 
Section: claims

1. A production device for forming an optical component having a grating structure, said production device comprising:a first light source generating monochromatic and incoherent light of the ultraviolet region;a primary irradiating means for radiating said monochromatic and incoherent light onto a silica-based optical waveguide diffused with at least one of hydrogen or deuterium so as to change a base line level of a refractive index of the silica-based optical waveguide;a second light source generating coherent light; anda secondary irradiating means for radiating said coherent light onto said silica-based optical waveguide so as to produce interference and further change the refractive index of the silica-based optical waveguide,wherein the primary irradiating means is configured to radiate the monochromatic light radiated onto the silica-based optical waveguide without producing interference. 2. The production device of claim 1, wherein the primary irradiating means and the secondary irradiating means are configured to radiate a circumferential surface of the silica-based optical waveguide. 3. The production device of claim 1, wherein said first light source is an excimer lamp. 4. The production device of claim 1, wherein the wavelength of said monochromatic light is 172 nm. 5. The production device of claim 1, wherein the wavelength of said monochromatic light is 222 nm. 6. The production device of claim 1, wherein said primary irradiating means radiates said monochromatic light onto said optical waveguide from multiple directions. 7. The production device of claim 1, wherein said primary irradiating means further comprises:a determining means for determining whether a refractive index of said optical waveguide is a predetermined refractive index; anda control means for controlling the commencement and cessation of radiation of said monochromatic light based on a result of the determination by said determining means. 8. The production device of claim 7, wherein said determining means is a timer for determining a duration of a time of radiation of said monochromatic light. 9. The production device of claim 7, wherein said determining means is an optical power meter which detects a power of said monochromatic light. 10. The production device of claim 7, wherein said determining means comprises an optical fiber grating for use in detecting a change in the refractive index of said optical waveguide. 11. The production device of claim 1, wherein said primary irradiating means comprises:an amplitude mask configured to interrupt said monochromatic light;a means for moving said amplitude mask along said silica-based optical waveguide; anda mask movement controller which controls a speed of movement of said amplitude mask along said silica-based optical waveguide.