The invention features devices and methods for collecting and measuring light from external light sources. In general, the devices of the invention feature a light diffusing element, e.g., as a component of a light collector, connected by a light conducting conduit, e.g., a fiber optic cable, to a light measuring device, e.g., a spectrometer. This light diffusing element allows, e.g., for substantially uniform light diffusion across its surface and thus accurate measurements, while permitting the total footprint of the device to remain relatively small and portable. This light diffusing element also allows flexibility in scaling of the device to permit use in a wide range of applications.

An optical system comprising a randomizer that has a plurality of randomly positioned scatterers for scattering and thereby randomizing light to generate a speckle pattern and a detector for detecting the speckle pattern to determine at least one property of the light and/or change in at least one property of the light.

The invention relates to a measuring arrangement for detecting an absolute reflection spectrum of a sample in a process for producing the sample. It comprises a light source for generating measurement light, a homogenizer for generating a uniform spatial illuminance distribution of the measurement light; a movable reflector and a receiver for collecting the measurement light reflected from the sample and/or the reflector. According to the invention, the reflector both for a reference measurement and for a sample measurement is positioned in an observation beam path and arranged on the same side of the sample as the light source in order to feed the reflected measurement light to the receiver.

An optical system comprising a randomizer that has a plurality of randomly positioned scatterers for scattering and thereby randomizing light to generate a speckle pattern and a detector for detecting the speckle pattern to determine at least one property of the light and/or change in at least one property of the light.

A photoreceiver device includes a light detector connected between a power supply node and a first node, and first to third switching elements. The light detector is configured to detect an incident optical data signal, and to output photocurrent corresponding to a magnitude of the optical data signal through the first node. The first switching element is connected between the first node and a ground node. The second switching element is connected between the power supply node and a second node. The third switching element is connected between the second node and the ground node. The third switching element has a control node connected to the first node.

A differential goniophotometer includes: an integrating sphere including an interior bounded by an interior wall and that receives, in the interior, a primary light source that provides primary light; and a fisheye lens disposed in the interior of the integrating sphere in optical communication with the primary light source such that the fisheye lens: receives the primary light from the primary light source, and provides a curvilinear image of the interior of the integrating sphere and the primary light.

A device for measuring the performance of an optical detector includes a cryostat, a holder capable of receiving the detector, secured to the inside of the cryostat, and means for measuring the performance of the detector. It also includes a screen arranged around the holder capable of limiting the radiation likely to reach the holder in a wavelength range of the detector, and a single-mode optical fiber in the wavelength range of the detector, inserted in an opening of the cryostat. The device further comprises at least one luminous flux generation module that incorporates a fibered source capable of generating the luminous flux in the optical fiber.

A lighting dome that can be used to inspect semiconductor wafers can include a small aperture, backlighting, a reflectance gradient and/or a broad spectrum light source.

A photoreceiver device includes a light detector connected between a power supply node and a first node, and first to third switching elements. The light detector is configured to detect an incident optical data signal, and to output photocurrent corresponding to a magnitude of the optical data signal through the first node. The first switching element is connected between the first node and a ground node. The second switching element is connected between the power supply node and a second node. The third switching element is connected between the second node and the ground node. The third switching element has a control node connected to the first node.

A reference light source device for calibration of a spectral radiance meter includes an integrating sphere having a radiance reference plane, which is an opening; and a plurality of first optical ports, which are formed apart from each other in an outer wall of the integrating sphere to allow light rays with equivalent wavelength characteristics to enter an interior of the integrating sphere.