An optical system for adjusting a proportion of light of a particular spectral band that is emitted from the optical system. A dichroic mirror is configured to reflect light of a first spectral band from a light source towards a distal end of an optical fiber while allowing light of a second spectral band to pass through the dichroic mirror. The second mirror is positioned behind the dichroic mirror and is configured to reflect light of the second spectral band. A mirror actuator is coupled to the second mirror and is configured to adjust a proportion of the light of the second spectral band that is emitted by the optical system by adjusting a position of the second mirror relative to the dichroic mirror.

An illumination system including at least one light source, a reflection cover, a wavelength conversion element, and a filter element is provided. A focal point of the reflection cover is disposed on an extension line of a transmission path of an excitation beam provided by the light source, and an opening of the reflection cover is adjacent to the focal point. The wavelength conversion element penetrates through the opening, and has a light-action region. The light-action region is disposed on the transmission path of the excitation beam, and converts the excitation beam into a conversion beam. The reflection cover is disposed on a transmission path of the conversion beam. The filter element is disposed on a transmission path of the conversion beam from the reflection cover. The conversion beam from the reflection cover is obliquely incident to the filter element, and the filter element filters the conversion beam.

A light-emitting device for increasing power by combining beams from a plurality of light sources and for improving focusing performance including a plurality of light sources; and a light-outputting device for generating collimated beams for respective emitted lights from the plurality of light sources and for outputting enlarged beams wherein the beam diameters of the respective collimated beams have been enlarged in the direction wherein the beam diameters are small.

The present invention relates to a lighting device (300) having a housing (302) and multiple light sources (308) arranged in the housing. The light sources emit light of a first wavelength range. The lighting device includes a wavelength converting member (310) arranged at a distance from the light sources, and it comprises a first wavelength converting material configured to convert a part of said light of a first wavelength range into light of a second wavelength range. The lighting device further includes a color distribution member (312) providing a color distribution of the light emitted from the lighting device where the ratio of intensity of light with the first wavelength range to the intensity of light with the second wavelength range is larger at low angles to a light output surface of the lighting device than at high angles to the light output surface.

A light-source optical system according to the present invention includes a laser light source that radiates excitation light; a wavelength conversion unit that is irradiated with the excitation light to generate light having a wavelength different from that of the excitation light; and a light deflection and convergence unit that causes an odd number of light beams greater than or equal to three, radiated from the wavelength conversion unit in mutually different directions, to converge at and re-enter the wavelength conversion unit from the backward direction of another light beam, radiated in a direction different from the directions of the odd number of light beams greater than or equal to three, thereby making the odd number of light beams greater than or equal to three overlap the other light beam.

An illumination optical system with a tunable beam angle (IOSTBA) is presented to achieve different beam angles without changing parts. The IOSTBA includes a light source and a post having a proximal end and a distal end, the proximal end in optical communication with the light source, an internal area of the post having a reflective surface. Also shown is a diffuser disposed across the end of the post, the diffuser in optical communication with the post and a reflector surrounding a portion of the post, the reflector movable along a length of the post. A position of the reflector along the post determines a beam angle of a resulting light beam exiting the IOSTBA. The system features a simple and cost effective optical design which works with a variety of light sources, including color mixing and champing strategies.

A polarization-modulating element for modulating a polarization state of incident light into a predetermined polarization state, the polarization-modulating element being made of an optical material with optical activity and having a circumferentially varying thickness profile.

The present invention has as its object the provision of a fluorescence light source device that can obtain high luminous efficiency. A fluorescence light source device of the present invention includes a wavelength conversion member that emits fluorescence by excitation laser light. The wavelength conversion member has an excitation laser light receiving surface including a periodic structure having a periodic array of conical or truncated projections with an aspect ratio, which is a ratio of the height of the projection to the pitch in the periodic structure, of not lower than 0.2. The wavelength conversion member is formed from a phosphor composed of a polycrystal and contains a micro-scatterer with a refractive index of not lower than 1.0 for scattering the excitation laser light and fluorescence emitted from the phosphor. A ratio (T/R) between a light transmission percentage T [%] in the wavelength conversion member and a light reflection percentage R [%] in the wavelength conversion member is 1 to 20.

An illuminating device includes: first lenses individually corresponding to LEDs; a light control member including light transmission channels individually corresponding to the first lenses and a light blocker surrounding the light transmission channels; and second lenses individually corresponding to the light transmission channels. Each first lens includes a light concentrator for producing concentrated light by concentrating light emitted from a corresponding LED, and a reflector surrounding the light concentrator to produce reflected light by reflecting light emitted from the corresponding LED in a direction across the concentrated light. Each first lens outputs illumination light including the concentrated light and the reflected light produced from the corresponding light emitting diode. Each light transmission channel transmits the illumination light output from a corresponding first lens. The light blocker prevents transmission of the illumination light emitted from each first lens. Each second lens refracts the illumination light transmitted by a corresponding light transmission channel.

A portable indirect lighting apparatus includes first and second support structures. Each support structure includes a respective longitudinal light source having a linear array of light-emitting diodes (LEDs). A respective longitudinal lens is positioned proximate to each linear array of LEDs to receive and redirect the light emitted by the LEDs. A flexible reflector extends between the first and second support structure. The reflector has at least one diffusedly reflective surface. The reflector is configurable to an operational configuration with the diffusedly reflective surface positioned to receive the light redirected by the first and second longitudinal lenses. The reflector is configurable to a transportable configuration with at least a portion of the reflector wrapped around at least one of the first and second support structures.