The present disclosure relates to a spectrometer arrangement for analyzing optical radiation from a light source comprising an echelle grating for dispersion of the radiation entering the spectrometer arrangement in a main dispersion direction, a dispersion element for dispersing the radiation in a cross-dispersion direction, the main dispersion direction and the cross-dispersion direction having a predeterminable angle to each other, and a detector unit for acquiring a first spectrum of a first part of the radiation comprising a first predeterminable wavelength range. According to the present disclosure, the spectrometer arrangement comprises a first optical element, which is arranged or configured in such a way that a second spectrum of a second part of the radiation comprising a second predeterminable wavelength range differing from the first can be acquired by means of the detector unit.

Provided are a filter array, a spectral detector including the filter array, and a spectrometer employing the spectral detector. The filter array may have a multi-array structure including a plurality of filter arrays. The filter array may include a first filter array having a first structure in which a plurality of first filters with different transmittance spectrums are arranged, and a second filter array having a second structure in which a plurality of second filters with different transmittance spectrums are arranged, the second filter array being arranged to at least partially overlap the first filter array at a first position relative to the first filter array so that the multi-arrangement type filter array has a first set of absorbance characteristics. The second filter array may be configurable to be arranged to at least partially overlap the first filter array at a second position relative to the first filter array so that the multi-arrangement type filter array has a second set of absorbance characteristics different from the first set of absorbance characteristics.

A meteorological lidar performs highly precise meteorological observation by primarily removing elastically scattered light and by detecting rotational Raman-scattered light without filtering it out. The meteorological lidar according to embodiments measures scattered light of a laser beam, and includes: a diffraction grating diffracting rotational Raman-scattered light contained in scattered light in accordance with the wavelength of rotational Raman-scattered light; a detector detecting the diffracted rotational Raman-scattered light; and a removing element primarily removing elastically scattered light of a specific wavelength contained in the scattered light.

An apparatus is provided that includes a detector configured to detect, cumulatively during an exposure period, spatially modulated light. The apparatus also includes modulation means for applying multiple different effective spatial modulations to received light, during the exposure period. A different effective spatial modulation is applied to received light in dependence upon a time during the exposure period of the detector and a frequency of the light, to produce spatially modulated light for detection by the detector.

To implement a configuration for enabling independent adjustment of a spatial resolution and a wavelength resolution of a spectroscopic measurement device. A spatial resolution adjustment unit configured to adjust a spatial resolution of the spectroscopic measurement device, and a wavelength resolution adjustment unit configured to adjust a wavelength resolution of the spectroscopic measurement device are included, and the spatial resolution adjustment unit maintains output light from a condensing unit to a spectroscopic imaging unit of the spectroscopic measurement device as parallel light, adjusts a parameter of a constituent element of the condensing unit, and changes the spatial resolution without changing the wavelength resolution of the spectroscopic measurement device. The wavelength resolution adjustment unit adjusts a parameter of a spectroscopic imaging unit of the spectroscopic measurement device and changes the wavelength resolution without changing the spatial resolution of the spectroscopic measurement device.

A method includes directing a first plurality of probe laser pulses through a sample, dividing each of the first plurality of probe laser pulses to generate a first interferogram, and generating first image data reproducible as a first phase image of the sample. A plurality of pump laser bursts are directed onto the sample to heat the sample. A second plurality of probe laser pulses are directed through the sample at a predetermined time delay. Each of the second plurality of probe laser pulses are divided to generate a second interferogram. Second image data is generated that is reproducible as a second phase image of the sample. A transient phase shift is determined in the second phase image relative to the first phase image. A vibrational spectroscopy property is determined of the sample based on the transient phase shift, thereby allowing an identification of chemical bond information of within the sample.

The invention relates to a device for detecting features in a three-dimensional hyperspectral scene (3), comprising a system for direct detection (1) of features in the hyperspectral scene (3) which incorporates a deep and convolutional neural network (12, 14) designed to detect the one or more searched features in the hyperspectral scene (3) from a compressed image of said hyperspectral scene.

Methods, devices and systems provide improved spectral imaging and detection and can be implemented as compact, light-weight and low-cost devices. An example device includes a mask that includes a plurality of apertures and positioned to receive light from an object of interest. A first lenslet array is positioned to receive light that passes through the plurality of apertures. Each lenslet of the first lenslet array receives the light from a corresponding aperture and produces collimated light that is incident on a dispersive element, such as a diffraction grating or a prism, which produces a plurality of spectrally separated components. A second lenslet array receives the spectrally separated components and focuses each of the spectrally separated components onto an image plane, where a sensor is located. The information obtained from the sensor can be used to determine or analyze spectral characteristics of the object, which can be in gaseous form.

A spectroscopic apparatus includes a splitter that receives a first detected signal output from a sample to which an incident beam is irradiated, and outputs a reflected signal and a second detected signal by splitting the first detected signal, and a signal processor that receives the reflected signal and the second detected signal, and extracts a Raman signal from the second detected signal in response to the received reflected signal.

Described herein are an apparatus, system, and method for detecting light. An apparatus can include means for modulating an input beam of light wherein the input beam of light is obtained from an optical coherence tomography arrangement; means for dispersing the modulated beam of light; and means for detecting the dispersed beam of light and converting the detected beam of light into an electrical output signal. An apparatus can include a modulator configured to spatially modulate light; a dispersing element configured to disperse modulated light, and a detector configured to detect dispersed light and convert the detected light into electrical output signals. A method can include spatially modulating a beam of light, dispersing the modulated beam of light, detecting the dispersed beam of light, converting the detecting beam of light into electrical output signals, and providing a three-dimensional image of at least a part of an object.