A photoirradiation device includes an insertion path for inserting a wire rod; a first reflector having a circular arc shape centered on a point shifted from a center of the insertion path by a first distance, one side of the first reflector facing the insertion path being a reflective surface; a second reflector disposed adjacent open edges of the first reflector and having a circular arc shape centered on a point shifted from the center of the insertion path by a second distance that is different from the first distance, one side of the second reflector facing the insertion path being a reflective surface; and a light source that is positioned on an opposite side of the insertion path from the first reflector and that projects light toward the wire rod.

A light irradiation device includes a light source having a plurality of solid-state elements disposed on a substrate to be defined by a first direction and a second direction in a plurality of rows and irradiate the irradiation target with light from a third direction, an optical element refracting light from the solid-state elements, emitting the light and narrowing a spread angle of light to be emitted from the solid-state elements relative to the third direction, a first reflection portion having at least two first reflection surfaces on a downstream side in the third direction of the irradiation target and reflecting a part of light incident on the first reflection surface to the irradiation target, and a second reflection portion having a pair of second reflection surfaces disposed between the optical element and the first reflection portion and guiding light from the optical element to the first reflection surface.

A light irradiation device includes a light source having a plurality of solid-state elements disposed on a substrate to be defined by a first direction and a second direction in a plurality of rows and irradiate the irradiation target with light from a third direction, an optical element refracting light from the solid-state elements, emitting the light and narrowing a spread angle of light to be emitted from the solid-state elements relative to the third direction, a first reflection portion having at least two first reflection surfaces on a downstream side in the third direction of the irradiation target and reflecting a part of light incident on the first reflection surface to the irradiation target, and a second reflection portion having a pair of second reflection surfaces disposed between the optical element and the first reflection portion and guiding light from the optical element to the first reflection surface.

An optical nanocomposite containing optically active crystals (rare earth or transition metal doped) in a suitably index-, dispersion-, thermo-optically matched matrix enables creation of a glass ceramic with unique optical properties. By further tuning the viscosity of the composite, it can be drawn into fiber form, dissolved into solution and subsequently deposited as a thin film, or used as a bulk optical component. Critical to achieving a viable material is closely matching the attributes needed to not only achieve optical function but to enable fabrication under elevated temperatures (i.e., during fiber drawing) or in unique chemical or thermal environments, such as during deposition as a thin film. This invention uses nanosized crystalline powders (nanocrystalsNC), blended with multicomponent chalcogenide glass (ChG) to form an optical nanocomposite. The blended NC:glass integrates compositional tailoring to enable matching of optical properties (index, dispersion, dn/dT), specialized dispersion methods to ensure homogeneous physical dispersion of NCs within the glass matrix during preparation, while minimizing agglomeration and mismatch of coefficient of thermal expansion. The latter attributes are critical to maintaining low loss (optical scatter) and induced stress birefringence due to mismatch between the NC and glass' parent properties. By tailoring the base glass composition's viscosity versus temperature profile, the resulting bulk nanocomposite can be further formed to create an optical fiber, while maintaining physical dispersion on NCs, avoiding segregation of the NCs. This enables low loss conditions suitable for lasing within the material.

Optical fiber systems and related methods are provided. The optical fiber systems include at least one optical fiber and at least one light source. The optical fibers include a core, a cladding, and a jacket. Scattering structures are dispersed within the cladding. The optical fibers are configured to scatter light by way of the scattering structures away from the core to emit radial lighting along the length of the optical fibers.

Optical fiber systems and related methods are provided. The optical fiber systems include at least one optical fiber and at least one light source. The optical fibers include a core, a cladding, and a jacket. Scattering structures are dispersed within the cladding. The optical fibers are configured to scatter light by way of the scattering structures away from the core to emit radial lighting along the length of the optical fibers.

Provided are an optical fiber and a manufacturing method of the optical fiber that can reduce transmission loss even when drawing is performed at a high tension and a high rate. An optical fiber has a core to which chlorine is added and a clad to which fluorine is added, chlorine of 9000 to 13000 ppm is added to the core, a relative refractive index difference 1 of the core to a pure silica glass is 0.09 to 0.13%, a relative refractive index difference 2 of the clad to a pure silica glass is 0.36 to 0.17%, a difference (12) between the relative refractive index difference 1 of the core and the relative refractive index difference 2 of the clad is larger than or equal to 0.30%, a mode field diameter at wavelength 1.31 m is 8.8 to 9.6 m, and a stress difference occurring at an interface between the core and the clad is lower than or equal to 60 MPa.

Radiation curable compositions for coating optical fibers are disclosed herein. In an embodiment, a radiation curable composition includes a reactive oligomer component, wherein a portion of the polymerizable groups of the reactive oligomer component include methacrylate groups; a reactive diluent monomer component, wherein a portion of the polymerizable groups of the reactive diluent monomer component include acrylate groups, acrylamide groups, or N-vinyl amide groups, or combinations thereof; a photoinitiator component, and an optional additive component. Also described are methods of coating the radiation curable compositions elsewhere described, and the fiber optic coatings and cables resulting therefrom.

Radiation curable compositions for coating optical fibers are disclosed herein. In an embodiment, a radiation curable composition includes a reactive oligomer component, wherein a portion of the polymerizable groups of the reactive oligomer component include methacrylate groups; a reactive diluent monomer component, wherein a portion of the polymerizable groups of the reactive diluent monomer component include acrylate groups, acrylamide groups, or N-vinyl amide groups, or combinations thereof; a photoinitiator component, and an optional additive component. Also described are methods of coating the radiation curable compositions elsewhere described, and the fiber optic coatings and cables resulting therefrom.

A composite material includes one or more side-emitting optical fibers arranged in a pattern defining openings bounded at least in part by the one or more side-emitting optical fibers. The one or more side-emitting optical fibers have a UV-C transparent coating, and at least one of the one or more side-emitting optical fibers is configured to be coupled to a light-emitting diode. A reverse osmosis filter includes a reverse osmosis membrane and the composite material coupled to the reverse osmosis membrane.