A light barrel configured to filter out stray light of a test light includes a casing and a number of light shield plates arranged within the casing. The light shield plates are parallel to each other and arranged within the casing along a direction in which the light source emits the test light. Each of the light shield plates defines a through hole for light from the test light to pass through. The through holes of the light shield plates are a same size and aligned. The light shield plates sequentially filter out stray light that does not pass through the through holes.

A superconducting nanowire single photon detector (SNSPD) device includes a substrate, a distributed Bragg reflector on the substrate, a seed layer of a metal nitride on the distributed Bragg reflector, and a superconductive wire on the seed layer. The distributed Bragg reflector includes a plurality of bi-layers, each bi-layer including lower layer of a first material and an upper layer of a second material having a higher index of refraction than the first material. The wire is a metal nitride different from the metal nitride of the seed material.

A photodetection device includes a photodetection element and a package. The photodetection element includes a semiconductor substrate and a light absorption film. The light absorption film is provided on a region of at least a part of a region around a photodetection region on a principal surface of the semiconductor substrate. The light absorption film has a multi-layer structure including a light absorption layer, a resonance layer, and a reflection layer. At a wavelength of detection target light, a light transmittance inside the resonance layer is larger than a light transmittance inside the light absorption layer, and a light reflectance on a surface of the reflection layer is larger than a light reflectance on a surface of the resonance layer.

Systems, methods, and apparatuses for providing on-board electromagnetic radiation sensing using beam splitting in a radiation sensing apparatus. The radiation sensing apparatuses can include a micro-mirror chip including a plurality of light reflecting surfaces. The apparatuses can also include an image sensor including an imaging surface. The apparatuses can also include a beamsplitter unit located between the micro-mirror chip and the image sensor. The beamsplitter unit can include a beamsplitter that includes a partially-reflective surface that is oblique to the imaging surface and the micro-mirror chip. The apparatuses can also include an enclosure configured to enclose at least the beamsplitter and a light source. With the apparatuses, the light source can be attached to a printed circuit board (PCB). Also, the enclosure can include an inner surface that has an angled reflective surface that is configured to reflect light from the light source in a direction towards the beamsplitter.

A device having a stack includes an image sensor in MOS technology adapted to detect a radiation; a first lens array; a structure formed of at least a first matrix of openings delimited by walls opaque to the radiation; and a second lens array.

The invention discloses an optical system for generating arbitrary-order optical vortex arrays and finite optical lattices with defects, comprising a laser, a collimating and beam-expanding system, a spatial light modulator, a 4-f lens system, and an image detector which are disposed according to a light path. After passing through the collimating and beam-expanding system, the linearly-polarized Gaussian beam emitted by the laser is radiated to the spatial light modulator to be modulated in complex amplitude; the first-order diffraction beam of the emergent light generates an arbitrary-order alternating optical vortex array on the back focal plane of the first 2-f lens system, and an adjustable finite optical lattice with defects on the back focal plane of the second 2-f lens system. The topological charge value of each vortex and the spacing between vortices, in the generated arbitrary-order alternating optical vortex array, can be precisely controlled.

Some embodiments may include a power monitor to measure power of laser light propagating in a core of an optical fiber; the power monitor to generate a sensor signal using an optical sensor having a light sensitive section with no line of sight to part of the optical fiber; wherein the sensor signal is derived from light emerging laterally from the part of the optical fiber. Other embodiments may be disclosed and/or claimed.

Provided are a bandpass filter having a high light transmittance in a transmission band and a wide wavelength range showing a high transmittance in the transmission band, and a sensor. The bandpass filter is a bandpass filter including a reflective member A and a reflective member B, in which a difference between a reflection center wavelength of the reflective member A and a reflection center wavelength of the reflective member B is larger than a sum of a half width at half maximum of a reflection band of the reflective member A and a half width at half maximum of a reflection band of the reflective member B; the reflective member A has a first cholesteric liquid crystal layer and a second cholesteric liquid crystal layer, and birefringence Δn1 of the first cholesteric liquid crystal layer is larger than birefringence Δn2 of the second cholesteric liquid crystal layer; and the reflective member B has a third cholesteric liquid crystal layer and a fourth cholesteric liquid crystal layer, and birefringence Δn3 of the third cholesteric liquid crystal layer is larger than birefringence Δn4 of the fourth cholesteric liquid crystal layer.

Systems, methods, and apparatuses for providing electromagnetic radiation sensing using sequential beam splitting. The apparatuses can include a micro-mirror chip having a plurality of light reflecting surfaces, an image sensor having an imaging surface, and a beamsplitter unit located between the micro-mirror chip and the image sensor. The beamsplitter unit includes a plurality of beamsplitters aligned along a horizontal axis that is parallel to the micro-mirror chip and the imaging surface. The beamsplitters implement the sequential beam splitting. Because of the structure of the beamsplitter unit, the height of the arrangement of the micro-mirror chip, the beamsplitter unit, and the image sensor is reduced such that the arrangement can fit within a mobile device. Within a mobile device, the apparatuses can be utilized for human detection, fire detection, gas detection, temperature measurements, environmental monitoring, energy saving, behavior analysis, surveillance, information gathering and for human-machine interfaces.

An optical measurement device includes an optical system that focuses emitted light that is emitted from a measurement surface of a light emitting electronic display or a light emitting surface of which a speckle contrast or a sparkle contrast is to be measured; a two-dimensional sensor array having a two-dimensional sensor array surface on which the emitted light is focused, the two-dimensional sensor array capturing an image of the emitted light; and a calculation unit that calculates the speckle contrast or the sparkle contrast based on the image of the emitted light captured under an imaging condition under which a size of a light-emitting region on the measurement surface is constant, the light-emitting region contributing to formation of a diffraction limited spot of the emitted light on the two-dimensional sensor array surface.