A tunable spectral filter includes a first tunable dispersive element, a first optical element, a spatial filtering element located at the focal plane, a second optical element, and a second dispersive element. The first tunable dispersive element introduces spectral dispersion to an illumination beam with an adjustable dispersion. The first optical element focuses the illumination beam at a focal plane in which a distribution of a spectrum of the spectrally-dispersed illumination beam at the focal plane is controllable by adjusting the dispersion of the first tunable dispersive element. The spatial filtering element filters the spectrum of the illumination beam based on the distribution of the spectrum of the illumination beam at the focal plane. The second optical element collects the spectrally-dispersed illumination beam transmitted from the spatial filtering element. The second tunable dispersive element removes the dispersion introduced by the first tunable dispersive element from the illumination beam.

A light emitting module includes: a first light source comprising a first light emitting element configured to emit first light, and a first wavelength conversion member configured to convert a wavelength of a portion of the first light and to emit second light, such that the first light source is configured to output light that includes the first light and the second light; a first lens on which the light output from the first light source is incident; a drive unit configured to change a distance between the first lens and the first light source so as to change an amount of outgoing second light from the first lens; a second light source configured to output light having a chromaticity that is different from that of the light output from the first light source; and a second lens on which the light output from the second light source is incident.

An optical component includes a phase diffraction grating and an amplitude diffraction grating. The phase diffraction grating includes a center concave section and a plurality of ring stages. The ring stages surround the center concave section. The center concave section and the ring stages form a cavity, where a light source is disposed in the cavity and emits the light to the optical component. Each of the ring stages has a stage surface. Each of the stage surfaces includes a plurality of ring microstructures arranged in concentric circles. The widths of each ring microstructure in at least one of the ring stages are less than the quarter wavelength of the light. The amplitude diffraction grating includes a center convex section and a plurality of ring parts. The center convex section and the center concave section are aligned. The ring parts surround the central convex section.

An optical component includes a phase diffraction grating and an amplitude diffraction grating. The phase diffraction grating includes a center concave section and a plurality of ring stages. The ring stages surround the center concave section. The center concave section and the ring stages form a cavity, where a light source is disposed in the cavity and emits the light to the optical component. Each of the ring stages has a stage surface. Each of the stage surfaces includes a plurality of ring microstructures arranged in concentric circles. The widths of each ring microstructure in at least one of the ring stages are less than the quarter wavelength of the light. The amplitude diffraction grating includes a center convex section and a plurality of ring parts. The center convex section and the center concave section are aligned. The ring parts surround the central convex section.

A light-emitting device assembly includes an emitter array of light-emitting elements, a transparent substrate, a structured lens, and an angular filter. The emitter array emits from its emission surface output light that is transmitted through the substrate, and enables selective activation of and emission from individual elements or subsets of elements of the array. The structured lens is formed on or in the substrate, and comprises micro- or nano-structured elements resulting in an effective focal length less than an effective distance between the structured lens and the emission surface. The angular filter is positioned on or in the substrate or on the emission surface and exhibits decreasing transmission or a cutoff angle with increasing angle of incidence.

A light-emitting device assembly includes an emitter array of light-emitting elements, a transparent substrate, a structured lens, and an angular filter. The emitter array emits from its emission surface output light that is transmitted through the substrate, and enables selective activation of and emission from individual elements or subsets of elements of the array. The structured lens is formed on or in the substrate, and comprises micro- or nano-structured elements resulting in an effective focal length less than an effective distance between the structured lens and the emission surface. The angular filter is positioned on or in the substrate or on the emission surface and exhibits decreasing transmission or a cutoff angle with increasing angle of incidence.

An illuminator enables the selection of different color temperatures for different medical, dental or surgical procedures. A first circuit board is moveable with respect to the housing and a second circuit board is fixed within the housing. A plurality of LEDs are mounted on the first circuit board, which receives power from electrical contacts between the two boards. A user control enables a user to move the first circuit board between different positions, wherein, in each position, different LEDs or combinations of the LEDs emit light through the light-transmission window. Movement of the user control may cause the first circuit board to rotate or slide relative the second circuit board. The source of electrical power may be remote or integrated batteries. The rear portion of the housing may include a mount for attaching the illuminator to eyeglass frames, a headband, or other head-mounting apparatus.

An illuminator enables the selection of different color temperatures for different medical, dental or surgical procedures. A first circuit board is moveable with respect to the housing and a second circuit board is fixed within the housing. A plurality of LEDs are mounted on the first circuit board, which receives power from electrical contacts between the two boards. A user control enables a user to move the first circuit board between different positions, wherein, in each position, different LEDs or combinations of the LEDs emit light through the light-transmission window. Movement of the user control may cause the first circuit board to rotate or slide relative the second circuit board. The source of electrical power may be remote or integrated batteries. The rear portion of the housing may include a mount for attaching the illuminator to eyeglass frames, a headband, or other head-mounting apparatus.

A light system having a light supply arrangement, a Homogenizing Light Pipe (HLP) and a fiber bundle. The light supply arrangement includes a light source and is arranged to supply light to an input end of the HLP. The HLP is configured for scrambling the received light and for delivering a beam of light to a common packed input end of the fiber bundle.

A light system having a light supply arrangement, a Homogenizing Light Pipe (HLP) and a fiber bundle. The light supply arrangement includes a light source and is arranged to supply light to an input end of the HLP. The HLP is configured for scrambling the received light and for delivering a beam of light to a common packed input end of the fiber bundle.