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Abstract
Optical spectrometers play an important role in modern scientific research. In this work, we present a two-channel spectrometer with a pixel resolution of better than 0.1 nm/pixel in the wavelength range of 200 to 950 nm and an acquisition speed of approximately 25 spectra per second. The spectrometer reaches a high k factor which characterizes the spectral performance of the spectrometer as k = (working wavelength region)/(pixel resolution) = 7500. Instead of using mechanical moving parts in traditional designs, the spectrometer consists of 8 integrated sub-gratings for diffracting and imaging two sets of 4-folded spectra on the upper and lower parts, respectively, of the focal plane of a two-dimensional backside-illuminated complementary metal-oxide-semiconductor (BSI-CMOS) array detector, which shows a high peak quantum efficiency of approximately 90% at 400 nm. In addition to the advantage of being cost-effective, the compact design of the spectrometer makes it advantageous for applications in which it is desirable to use the same two-dimensional array detector to simultaneously measure multiple spectra under precisely the same working conditions to reduce environmental effects. The performance of the finished spectrometer is tested and confirmed with an Hg-Ar lamp.
Highlights
The optical spectrometer is a key device in modern scientific research and industrial applications[1,2,3,4]
As it is necessary to measure the whole spectral distribution imaged on the focal plane of the detector, array detectors show considerable advantages over photomultiplier tube (PMT) detectors or other methods that use single photon detector to scan the spectral lines in a measurement process based on the wavelength-scanning interval
We study a novel compact spectrometer with two spectral channels working in the wavelength region of 200 to 950 nm that is based on an advanced two-dimensional backside-illuminated (BSI−) complementary metal-oxide-semiconductor (CMOS) array detector, which has better data processing efficiency and lower noise, instead of a CCD array detector
Summary
Every sub-grating is fixed at a specially designed angle such that the spectrally dispersed images of the wavelength lines are effectively focused on the corresponding subregions of the image plane of the detector. In this setup, a Dhyana 90 UV camera[16,17] is used in combination with a two-dimensional BSI-CMOS array detector with dimensions of 2048 × 2048 pixels and a pixel size of 11 × 11 μm[2] operating in the 190–1000 nm wavelength region. The dispersion relation varies slightly with the diffraction angle, the difference between spectral measurements at two wavelengths corresponding to two neighboring pixels can, in principle, be resolved with a maximum resolution of
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