Techniques for determining dynamically the intensity of the reflection from a transmissive cover and neutralizing it so as to improve the accuracy of depth measurements. Depth measurements of light modulation at multiple frequencies—which also can be used for depth disambiguation—are obtained and used to decouple the information to estimate the intensity of the signal reflected by the transmissive cover itself or a smudge on the transmissive cover, and the intensity of the signal reflected by the target object.

Systems and methods for testing a light emitting display unit having a plurality of light emitting elements are disclosed. Embodiments include a system with a test module, the test module including a plurality of light detection elements. Each of the plurality of light detection elements may generate a signal upon detection of light emitted from a light emitting element. The test module may also include a circuit. The circuit may receive input signals from the plurality of light detection elements, process the input signals based on a pre-determined function of the circuit, and generate an aggregate output signal based on the processing of the input signals. The circuit may also process the input signals based on discrete implementation of a combinational logic. The circuit may further receive instructions determining the combinational logic to be implemented.

The invention relates to a method for the sequential measurement of a plurality of semiconductor-based light sources such as LEDs, OLEDs or VCSELs, in particular comparatively low-luminosity light sources such as so-called micro-LEDs. The invention further relates to a device for carrying out the method. The object of the present invention is to provide a method that operates faster, more accurately and more sensitively than the known methods, which operate by scanning with a photodiode or with a spectrometer. The method according to the invention proposes for this that a current pulse is applied by means of a pulsed current source (1) to the low-luminosity light sources consecutively or simultaneously. The emitted light pulse of the LED (2) is converted into electric charge carriers by means of a photodiode (3), the electric charge carriers are added up by means of an integrator circuit (5), the added-together charge carriers are converted by means of an A/D converter (6) into a digital signal and the digital signal is forwarded to a measurement and control unit (7). The invention also relates to a method and a corresponding device for the sequential measurement of a plurality of optical pulses, wherein the pulsed light radiation enters an Ulbricht sphere (10) through an inlet opening (11), a first portion of the light radiation, which exits the Ulbricht sphere (10) following interaction with the same through a first outlet opening, is measured by means of a first detector (14, 18) and a second portion of the light radiation, which exits the Ulbricht sphere (10) without interaction with the same through a second outlet opening (19), is measured by means of a second detector (14′).

An optical detector device includes a housing with a projecting neck that is closed off towards the outside by a light-transmissive pane, under which at least one optical waveguide that tapers in the direction of an optical sensor is disposed. An optical waveguide arrangement has a plurality of optical waveguides which are retained in the neck by a holding mechanism.

Systems and methods for an integrated photonics quantum vector magnetometer are provided herein. In certain embodiments, a device includes a substrate; a radio frequency emitter that emits energy in a range of radio frequencies; and a waveguide layer formed on the substrate. The waveguide layer includes a first waveguide of a first material, wherein a probe laser is propagating within the first waveguide; and a second waveguide, wherein the second waveguide is positioned proximate to the first waveguide along a coupling length such that a pump laser propagating within the second waveguide is coupled into the first waveguide along the coupling length, wherein the pump laser causes the first material to absorb the probe laser at one or more frequencies in the range of frequencies. Moreover, the device includes a processing device that calculates a magnetic field strength based on an identification of the one or more frequencies.

The invention relates to a single photon detector device for detecting an optical signal comprising an optical fiber and at least one nanowire, wherein the optical fiber comprises a core area and a cladding area and is designed to conduct the optical signal along an optical axis, wherein, with respect to the optical axis, a first area of the optical fiber is an entrance area for the optical signal and a second area of the optical fiber is a detector area, and wherein the nanowire becomes superconducting at a predetermined temperature and is designed in the superconducting state to generate an output signal as a function of the optical signal. It is provided that in the detector area of the optical fiber the nanowire extends essentially along the optical axis of the optical fiber. A single photon detector device is thus provided which has a simple structure, a high efficiency, a high detection rate and a high spectral bandwidth.

The disclosure provides a light-emitting element inspection device optically connected to at least one light-emitting element of a test object and including a dark box, a slide rail, an image-capturing device, a light-entrance plate, and a processor. The slide rail and the image-capturing device are disposed in the dark box. The image-capturing device slides on the slide rail. The light-entrance plate is disposed on one side of the dark box and has at least one hole optically connected to the light-emitting element. The image-capturing device is aligned with the light-entrance plate to capture an image of the light-entrance plate. The processor is coupled to the image-capturing device and is adapted to obtain a set of RGB values of the image, convert the RGB values into a set of HSV values, and determine whether the light-emitting element of the test object conforms to a standard based on the HSV values.

Methods for design and production of highly sensitive active and passive light detecting devices and systems. Orders of magnitude improvement in optical signal detection is made possible in high noise or low contrast scenes. The current invention creates a small spectral difference between two parts of a split light stream. When recombined, the altered light streams partially correlate, and that generates full amplitude signal oscillation at a frequency that depends on the constituent spectrum. The full amplitude signals and spectrum dependent oscillation make signal discrimination much better than intensity-only methods. The effect of read noise, amplifier noise, dark current noise, and thermal noise due to photo detector shunt resistance, become less important when compared to light detection using prior art methods

A light detection device includes: a first optical fiber including a first core surrounded by a first cladding; a second optical fiber including a second core surrounded by a second cladding; a first cladding mode stripper provided outside the first cladding; a first light detector; and a second light detector. The second core has a diameter larger than a diameter of the first core and is connected to the first core. In a longitudinal direction of the first optical fiber, the first light detector is disposed on one side of the first cladding mode stripper and the second light detector is disposed on another side of the first cladding mode stripper.

A mode control system and method for controlling an output mode of a broadband radiation source including a photonic crystal fiber (PCF). The mode control system includes at least one detection unit configured to measure one or more parameters of radiation emitted from the broadband radiation source to generate measurement data, and a processing unit configured to evaluate mode purity of the radiation emitted from the broadband radiation source, from the measurement data. Based on the evaluation, the mode control system is configured to generate a control signal for optimization of one or more pump coupling conditions of the broadband radiation source. The one or more pump coupling conditions relate to the coupling of a pump laser beam with respect to a fiber core of the photonic crystal fiber.