Optical concepts for high-resolution imaging spectrometers

Blechinger, Fritz; Harnisch, Bernd; Kunkel, B.

doi:10.1117/12.210871

Cited by 12 publications

(4 citation statements)

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“…In the conventional off-axis configuration of a C-T spectrometer, the image of the input slit of the spectrometer will be slightly distorted on the focal plane of the 2D array detector, which is a phenomenon called spectral curvature (or the “smile” effect) 37 , 38 , which will reduce both the spectral resolution and the accuracy of the spectral measurement. By means of using a zero-off-axis configuration for a C–T spectrometer, the error arising from the “smile” aberration has been effectively overcome in the data calibration procedure.…”

Section: Discussionmentioning

confidence: 99%

A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings

Jiang

Chen

et al. 2021

Sci Rep

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Unlike the single grating Czerny–Turner configuration spectrometers, a super-high spectral resolution optical spectrometer with zero coma aberration is first experimentally demonstrated by using a compound integrated diffraction grating module consisting of 44 high dispersion sub-gratings and a two-dimensional backside-illuminated charge-coupled device array photodetector. The demonstrated super-high resolution spectrometer gives 0.005 nm (5 pm) spectral resolution in ultra-violet range and 0.01 nm spectral resolution in the visible range, as well as a uniform efficiency of diffraction in a broad 200 nm to 1000 nm wavelength region. Our new zero-off-axis spectrometer configuration has the unique merit that enables it to be used for a wide range of spectral sensing and measurement applications.

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Section: Discussionmentioning

confidence: 99%

A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings

Jiang

Chen

et al. 2021

Sci Rep

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“…The modeled spectral curve of the imaging spectrometer is obtained by convolution between the spectral response mode of the imaging spectrometer and the higher resolution spectral curve of the doped panel [4]. The higher resolution reflecting curve only be measured once by calibrated spectrometer and can be used for other imaging spectrometers.…”

Section: Spectral Calibration Methodsmentioning

confidence: 99%

Spectral calibration for the hyperspectral imager based on the doped panel

Zhou

Chen

et al. 2011

SPIE Proceedings

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The routine spectral calibration is time-consuming and is difficult to use in the field. In this paper, we present a new rapid spectral calibration method based on the holmium oxide panel which has rich of absorbed feature. The ratio of the Spectalon panel signals to the holmium oxide panel signals can be used to calibrate the imaging spectrometer. The spectral resolution of the spectrometer and the wavelength position on the detector array are determined by curve fitting method including Gaussian response model setting and spectral convoluting. The iteration strategy and Pearson coefficient are mix used to confirm the correlation or similarity between the measured and modeled spectral curve. Spectral calibration experiment shows that new method base on the absorbed feature panel can fulfill the quick, accurate and repeatable spectral calibrating requirement.

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“…More recently, the same goal of a linearized nondeviating prism was attempted by Ebizuka et al , using a three-element prism of three different glasses [27]. Blechinger et al show several linearized prism designs for deviating prisms [28], and Bittner et al develop an Offner-type imaging spectrometer using one or more Féry prisms cemented together, showing that one can linearize the dispersion by proper selection of the glasses and angles [29]. Refs.…”

Section: Historical Survey Of Direct-vision Dispersive Prism Designmentioning

confidence: 99%

Compound prism design principles, I

Hagen

Tkaczyk

2011

Appl. Opt.

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Prisms have been needlessly neglected as components used in modern optical design. In optical throughput, stray light, flexibility, and in their ability to be used in direct-view geometry, they excel over gratings. Here we show that even their well-known weak dispersion relative to gratings has been overrated by designing doublet and double Amici direct-vision compound prisms that have 14° and 23° of dispersion across the visible spectrum, equivalent to 800 and 1300 lines/mm gratings. By taking advantage of the multiple degrees of freedom available in a compound prism design, we also show prisms whose angular dispersion shows improved linearity in wavelength. In order to achieve these designs, we exploit the well-behaved nature of prism design space to write customized algorithms that optimize directly in the nonlinear design space. Using these algorithms, we showcase a number of prism designs that illustrate a performance and flexibility that goes beyond what has often been considered possible with prisms.

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Optical concepts for high-resolution imaging spectrometers

Cited by 12 publications

References 0 publications

A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings

A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings

Spectral calibration for the hyperspectral imager based on the doped panel

Compound prism design principles, I

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