Broadband high-spatial-resolution high-spectral-resolution flexible imaging spectrometer design study

Qinghua Yang

doi:10.1364/AO.431247

Applied Optics
Vol. 60,
Issue 34,
pp. 10490-10498
(2021)
•https://doi.org/10.1364/AO.431247

Broadband high-spatial-resolution high-spectral-resolution flexible imaging spectrometer design study

Qinghua Yang

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Qinghua Yang, "Broadband high-spatial-resolution high-spectral-resolution flexible imaging spectrometer design study," Appl. Opt. 60, 10490-10498 (2021)

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Abstract

A broadband high-spatial-resolution high-spectral-resolution flexible imaging spectrometer (B-2HSR-FIS) is presented, which includes two microlens arrays (MLAs), multiple fiber bundles, a scanning Fabry–Perot interferometer (FPI), a reflection grating, a cylindrical lens, and an area-array detector. The first MLA is arranged in a circular arc to obtain a field angle between 8° and 60° in the horizontal plane. The second MLA is arranged in a straight line. Each fiber bundle containing seven optical fibers is coupled to a separate microlens of the first MLA, subdividing the field angle of each microlens into seven smaller field angles to improve spatial resolution. The combination of a scanning FPI and a reflection grating enables the B-2HSR-FIS to obtain both high spectral resolution and broadband spectral range in the ultraviolet to near-infrared spectral region. Compared with all existing imaging spectrometers, the B-2HSR-FIS is the first to simultaneously obtain high spatial resolution, high spectral resolution, broadband spectral range, and moderate field angle, to the best of our knowledge. The B-2HSR-FIS has great potential for vision intelligence (e.g., as an eye of a robot).

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Wavelength Range	400 to 780 nm
Central wavelength	555.062 nm
Spectral resolution (in wavenumber)	$δ σ_{B - 2 H S R - F I S} = 0.5 c m^{- 1}$
Spectral resolution (in wavelength)	between approximately 8 pm at wavelength 400 nm and approximately 30 pm at wavelength 780 nm (see Fig. 7)
Angular resolution	$δ ϕ_{B - 2 H S R - F I S} = {0.1}^{\circ}$
Field of view (FOV)	12° in the horizontal plane, much greater than 0.3° in the vertical plane
The first MLA is arranged in a circular arc with an angle between 10° and 60°	$φ = {0.3}^{\circ}$ , $Q_{1} = 40$ , $D_{1} = 1.2 m m$ , $f_{1} = 12 m m$ , $R_{1} = 230 m m$
The second MLA is arranged in a straight line	$Q_{2} = 280$ , $D_{2} = 30 µ m$ , $f_{2} = 0.1 m m$
Multiple fiber bundles, each fiber bundle with seven hexagonal optical fibers	$D_{F B} = 65 µ m$ , $D_{F} = 20 µ m$ , $r_{C} = 2.5 µ m$ , $N A = 0.1$ , $\tan (θ_{o} / 2) = 0.1$
A scanning Fabry–Perot interferometer (FPI)	$N = 16$ , $d_{0} = 0.631142 m m$ , $d_{min} = 0.631019 m m$ , $d_{max} = 0.631282 m m$ , $D_{F P I X} \geq 16.8 m m$
A reflection grating	1600 grooves/mm, incident angle $α = 30^{\circ}$
A cylindrical lens	$f = 100 m m$
An area-array detector	$b = 20 µ m$ , $M_{X} = 840$ , $M_{Y} \geq 3714$

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Applied Optics