Far-ultraviolet astronomical narrowband imaging

Timothy A. Cook; Brian A. Hicks; Paul G. Jung; Supriya Chakrabarti

doi:10.1364/AO.48.001936

Applied Optics
Vol. 48,
Issue 10,
pp. 1936-1942
(2009)
•https://doi.org/10.1364/AO.48.001936

Far-ultraviolet astronomical narrowband imaging

Timothy A. Cook, Brian A. Hicks, Paul G. Jung, and Supriya Chakrabarti

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Timothy A. Cook, Brian A. Hicks, Paul G. Jung, and Supriya Chakrabarti, "Far-ultraviolet astronomical narrowband imaging," Appl. Opt. 48, 1936-1942 (2009)

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Abstract

We describe an all-reflective system for narrowband imaging suitable for imaging emission lines in the far ultraviolet. The system, which we call a monochromatic imager, combines a pupil plane grating monochromator with a telescope and camera to image a scene in one or more very narrow bands. The monochromator uses physical stops at its input and output apertures, and, as a result, the system has excellent rejection of out-of-band and off-axis light.

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Characteristic	Image Plane, Push Broom Spectrometer	Pupil Plane, MI
Primary size	$51 cm$ diameter	$51 \times 1.1 cm$
Telescope geometric area	$2042.8 {cm}^{2}$	$56.1 {cm}^{2}$
Spectrometer f-number	$f / 6$	$f / 6$
Spectral resolution	$0.5 Å$	$0.5 Å$
Slit width	$381 μm$	$381 μm$
Telescope focal length	$3060 mm$	$14477 mm$
Spatial resolution	$25^{″}$ (slit width)	$1 - 30^{″}$
System field of view	$25^{″} \times 20^{'}$	$20^{'}$ diameter
System field of view	$7.1 \times 10^{- 7} sr$	$2.6 \times 10^{- 5} sr$
Geometric etendue	$1.4 \times 10^{- 3} {cm}^{2} sr$	$1.5 \times 10^{- 3} {cm}^{2} sr$

Parameter	Value
Primary focal length	$510 mm$
Primary radius of curvature	$1020 mm$
Primary eccentricity	0.99995628
Primary aperture	$11 \times 510 mm$
Secondary radius of curvature	$35.976629 mm$
Secondary eccentricity	0.93309988
Telescope focal length	$14477 mm$
Telescope plate scale	$14^{″} / mm$
Monochromator grating radius of curvature	$611 \times 400 mm$
Monochromator grating ruling density	$3700 g / mm$
Monochromator grating order	Third
Monochromator slit width	$381 μm$
Monochromator incidence angle (α)	$33.4 °$
Monochromator diffraction angle (β)	$36.4 ° - 40.4 °$
Camera grating radius of curvature	$191 \times 145 mm$
Camera grating ruling density	$3800 g / mm$
Camera incidence angle (α)	$56.6 °$
Camera diffraction angle (β)	$19.8 ° - 23.3 °$
System focal length	$3438 mm$
System plate scale	$1^{'} / mm$

Characteristic	Image Plane, Push Broom Spectrometer	Pupil Plane, MI
Primary size	$51 cm$ diameter	$51 \times 1.1 cm$
Telescope geometric area	$2042.8 {cm}^{2}$	$56.1 {cm}^{2}$
Spectrometer f-number	$f / 6$	$f / 6$
Spectral resolution	$0.5 Å$	$0.5 Å$
Slit width	$381 μm$	$381 μm$
Telescope focal length	$3060 mm$	$14477 mm$
Spatial resolution	$25^{″}$ (slit width)	$1 - 30^{″}$
System field of view	$25^{″} \times 20^{'}$	$20^{'}$ diameter
System field of view	$7.1 \times 10^{- 7} sr$	$2.6 \times 10^{- 5} sr$
Geometric etendue	$1.4 \times 10^{- 3} {cm}^{2} sr$	$1.5 \times 10^{- 3} {cm}^{2} sr$

Parameter	Value
Primary focal length	$510 mm$
Primary radius of curvature	$1020 mm$
Primary eccentricity	0.99995628
Primary aperture	$11 \times 510 mm$
Secondary radius of curvature	$35.976629 mm$
Secondary eccentricity	0.93309988
Telescope focal length	$14477 mm$
Telescope plate scale	$14^{″} / mm$
Monochromator grating radius of curvature	$611 \times 400 mm$
Monochromator grating ruling density	$3700 g / mm$
Monochromator grating order	Third
Monochromator slit width	$381 μm$
Monochromator incidence angle (α)	$33.4 °$
Monochromator diffraction angle (β)	$36.4 ° - 40.4 °$
Camera grating radius of curvature	$191 \times 145 mm$
Camera grating ruling density	$3800 g / mm$
Camera incidence angle (α)	$56.6 °$
Camera diffraction angle (β)	$19.8 ° - 23.3 °$
System focal length	$3438 mm$
System plate scale	$1^{'} / mm$

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Applied Optics