A solar concentrator device is provided. The solar concentrator device includes a waveguide having a luminophore and a first refractive index; a photovoltaic component operably coupled to the waveguide; and a film disposed onto a surface of the waveguide, the film having a second refractive index. The second refractive index of the film is lower than the first refractive index of the waveguide. The waveguide and the film are visibly transparent.

A nanoparticle coater includes a housing; a nanoparticle discharge slot; a first combustion slot; and a second combustion slot.

A light source device according to the present disclosure includes a light-emitting body configured to emit first wavelength range light, a wavelength converter that includes an incident surface on which the first wavelength range light is incident, and an emission surface configured to convert the first wavelength range light to second wavelength range light and subsequently emit, and for which the incident surface is set to be larger than the emission surface, a light collector including a light input part configured to enter the second wavelength range light, and a scattering part disposed on the emission surface of the wavelength converter or on a side closer to the light collector than the emission surface, wherein the light collector includes a reflective layer configured to reflect the second wavelength range light entered by the light input part.

A backlight structure is provided in embodiments of the disclosure, including: a base plate; a light guide plate, on a surface of the base plate at a side thereof and having a plurality of through-holes passing therethrough; a plurality of LED chips, on a surface of the base plate at the same side as the light guide plate, each of the plurality of LED chips being located in one-to-one correspondence within one of the plurality of through-holes of the light guide plate; a fluorescent powder filler filling the plurality of through-holes; a plurality of reflecting elements, on a first surface of the light guide plate facing away from the base plate, respectively, and covering a side of the plurality of through-holes away from which open outwards at the base first surface of the light guide plate, respectively; and a plurality of light extracting structures, on the first surface of the light guide plate, respectively, and configured to guide light to exit therefrom.

A system for eye tracking is disclosed. The system may detect illumination including a first wavelength emitted from one or more illumination sources. The illumination may propagate along a waveguide(s) to a termination node(s) associated with the waveguide(s). The system may detect the illumination propagating a remote fluorophore located at the termination node(s). The system may determine that the remote fluorophore shifted the first wavelength to a second wavelength such that the illumination includes the second wavelength.

A solid body made of an inactive, light transmissive material has embedded therein an optical fiber having a lengthwise segment in which a scattering structure is formed that is to redirect primary propagating light sideways out of the fiber. An active photoluminescent layer integrated in the optical fiber is to wavelength-convert the primary light into secondary light. The solid body is generally cylindrical but without rotational symmetry about the center longitudinal axis of the fiber. A portion of the outer side surface of the body is curved and is covered by an external reflector, while another portion of the outer side surface is uncovered by the reflector in order for the secondary light to emerge. Other embodiments are also described and claimed.

Articles of manufacture, including terminations of or attachments to optical fibers are configured to substantially prevent axial emission and redirect radially most if not all light emanating from optical fibers. In that, a termination may include a fiber cap of a unitary construction of a tube and an optical element disposed to face a sealed end of the tube and dividing a hollow of the tube and having a conical surface, or an optical element dividing the hollow and complemented by a cone. An example of termination includes an optical fiber element having an up-tapered end with a maximum taper-diameter exceeding the core-diameter and ending at a conical element with an apex angle from about 70° to about 100°. Articles of manufacture additionally including mounting contraptions cooperating such terminations with cannulae to form an attachment to a laser system. Methods for transmitting light through such articles of manufacture.

An optical element is provided which includes an optical fiber, and a plurality of fluorophores disposed inside the optical fiber. The fluorophores have a quantum yield greater than 50%, and emit a spectrum of light having a maximum intensity at wavelengths within the range of 400 nm to 2000 nm.

A light emitting device includes: a substrate; a light emitting element disposed on the substrate; a plate-shaped light transmissive member having a first face, a second face opposite to the first face and a lateral face between the first face and the second face, the plate-shaped light transmissive member disposed so that the second face faces a light emission face of the light emitting element; a light shielding frame having an inner perimeter face surrounding the lateral face; a first light reflecting member disposed between the lateral face and the inner perimeter face so as to expose the first face of the light transmissive member; and a second light reflecting member disposed between the first light reflecting member and the substrate to cover a side face of the light emitting element.

A light-emitting device includes an optical fiber, a first light source unit, and a second light source unit. The optical fiber includes a wavelength converting portion. The wavelength converting portion is provided between a light incident portion and a light emerging portion. The wavelength converting portion contains a wavelength converting material. The wavelength converting material is excited by excitation light to produce a spontaneous emission of light having a longer wavelength than the excitation light and amplifies the spontaneous emission of light to produce an amplified spontaneous emission of light. The first light source unit makes the excitation light incident on the light incident portion. The second light source unit makes seed light, causing a stimulated emission of light to be produced from the wavelength converting material that has been excited by either the excitation light or the amplified spontaneous emission of light, incident on the light incident portion.