An optical filtering device, in particular for remote gas detection, including a member comprising a tubular passage accommodating a plurality of reflective structures capable of reflecting infrared wavelengths, said structures being elongated along an axis of the tubular passage and arranged around the axis. The reflective structures comprise means of filtering by absorption of bands of different wavelengths located in the infrared spectral band.

Apparatus and method for obtaining a plurality of spectral images of a source object in a snapshot using comprising two-dimensional compressed sensing data cube reconstruction (2D CS-SCR) applied to a dispersed-diffused snapshot image. In some embodiments, the snapshot image is obtained through a RIP diffuser. In some embodiments, a randomizer is used to further randomized the dispersed-diffused snapshot image. The 2D CS-SCR includes applying a 2D framelet transform separately to arrays representing different wavebands of spectral cube data derived from the snapshot image. The application of the 2D framelet transform separately to the arrays representing the different wavebands includes application of direct and inverse 2D framelet transforms to the arrays. In some embodiments, the direct and inverse framelet transforms are included in a split Bregman iteration.

Systems, tools, and methods are disclosed that utilize at least one integrated computational element to measure a property of a substance in close proximity to the substance's source. More specifically, systems, tools, and methods are presented that allow the interaction of electromagnetic radiation and the optically-processing of interacted electromagnetic radiation in proximity to an emergence of a fluid from the fluid's source. The integrated computational elements optically-process the interacted electromagnetic radiation into a weighted optical spectrum. The weighted optical spectrum enables the determination of various chemical or physical characteristics of the fluid.

A multichannel color measurement instrument for measuring spectral properties of a target comprises pick-up optics to collect measurement light, first and second anamorphic optical paths optically coupled to the pick up optics, a pick-up polarizing element located to polarize measurement light in the second anamorphic optical path, a reference anamorphic optical path including a reference illumination source, and a two-dimensional variable filter sensor having an optically transmissive filter function that varies in a first direction parallel to a surface of the variable filter sensor and is substantially constant in a second direction parallel to a surface of the variable filter sensor and orthogonal to the first direction. The anamorphic optical paths spread the measurement light in the first direction direct it on to different portions of the variable filter sensor.

A method, a system, and a non-transitory computer readable medium for Raman spectroscopy. The method may include determining first acquisition parameters of a Raman spectroscope to provide a first acquisition set-up, the determining is based on at least one expected radiation pattern to be detected by a sensor of the Raman spectroscope as a result of an illumination of a first area of a sample, the first area comprises a first nano-scale structure, wherein at least a part of the at least one expected radiation pattern is indicative of at least one property of interest of the first nano-scale structure of the sample; wherein the first acquisition parameters belong to a group of acquisition parameters; setting the Raman spectroscope according to the first acquisition set-up; and acquiring at least one first Raman spectrum of the first nano-scale structure of the sample, while being set according to the first acquisition set-up

A handheld spectrometer apparatus may comprise an accessory coupled to a spectrometer, where the accessory is configured to receive a liquid sample pipette to facilitate measurement, using the spectrometer, of a liquid sample within the pipette. A handheld spectrometer apparatus to measure a body lumen of a subject can include an illumination unit, a spectrometer unit, a housing containing the illumination unit and the spectrometer unit and an accessory comprising a plurality of optical fibers. The optical fibers can be configured to guide light from the illumination unit to the body lumen and back from the body lumen to the spectrometer unit.

A photo-thermal speckle spectroscopy device having an infrared laser, a visible laser, a foam, and a camera. The infrared and visible lasers are focused on the foam, which causes the visible laser to scatter. A camera records the speckle pattern, which shifts when the IR laser is turned on. The related method of photo-thermal speckle spectroscopy is also disclosed.

Described herein are optical sensing devices for photonic integrated circuits (PICs). A PIC may comprise a plurality of waveguides formed in a silicon on insulator (SOI) substrate, and a plurality of heterogeneous lasers, each laser formed from a silicon material of the SOI substrate and to emit an output wavelength comprising an infrared wavelength. Each of these lasers may comprise a resonant cavity included in one of the plurality of waveguides, and a gain material comprising a non-silicon material and adiabatically coupled to the respective waveguide. A light directing element may direct outputs of the plurality of heterogeneous lasers from the PIC towards an object, and one or more detectors may detect light from the plurality of heterogeneous lasers reflected from or transmitted through the object.

A device for guiding and absorbing electromagnetic radiation, the device including: absorbing means for absorbing the electromagnetic radiation; and a coupled to the absorbing means for guiding the electromagnetic radiation to the absorbing means, wherein the waveguide and the absorbing means are formed from a structure including a first cladding layer, a second cladding layer over the first cladding layer, and a quantum-well layer between the first and second cladding layers, the quantum-well layer being formed of a material having a different composition to the first and second cladding layers, wherein the thickness and the composition of the quantum-well layer is optimised to provide an acceptable level of absorption of electromagnetic radiation in the waveguide while providing an appropriate band gap for absorption of the electromagnetic radiation in the absorbing means.

A digital flashlamp controller, a flashlamp control system and a method of controlling a flashlamp bulb employing digital control electronics are provided herein. In one embodiment, the digital flashlamp controller includes: (1) a trigger interface configured to provide firing signals to control a trigger element for a flashlamp bulb and (2) digital electronics configured to generate the firing signals and control multiple pulsing of the flashlamp bulb.