Journal ArticleDOI
Correction of astigmatism in a Czerny-Turner spectrograph using a plane grating in divergent illumination
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TLDR
In this article, a method for eliminating the astigmatism of a Czerny-Turner spectrograph is described in which the grating is used in divergent illumination.Abstract:
A method for eliminating the astigmatism of a Czerny-Turner spectrograph is described in which the grating is used in divergent illumination. Expressions are given for the distances of the tangential and sagittal astigmatic images from the camera mirror in terms of the separation between the entrance slit and the collimating mirror and the condition for the elimination of astigmatism is derived. These results are compared with ray tracing data for a practical instrument. Experimental tests of spatial and spectral resolution for an f/15 spectrograph of 06 m focal length are given at wavelengths 5461 and 2800 A. Over a spectral range of 100 A centred on 2800 A a spatial resolution along the slit in excess of 50 cycles mm−1 has been achieved for a flat inclined image plane. For the same spectrograph with the grating in collimated light the spatial resolution is only 3 cycles mm−1.read more
Citations
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Journal ArticleDOI
Broadband astigmatism-corrected Czerny–Turner spectrometer
TL;DR: An off-the-shelf cylindrical lens is used to remove astigmatism over the full bandwidth and results show that better than 0.1 nm spectral resolution and more than 50% throughput were achieved over a bandwidth of 400 nm centered at 800 nm.
Journal ArticleDOI
Broadband astigmatism-free Czerny-Turner imaging spectrometer using spherical mirrors
TL;DR: The elimination of the astigmatism of a Czerny-Turner imaging spectrometer, built using spherical optics and a plane grating, over a broad spectral region is described.
Journal ArticleDOI
The Far Ultra-Violet Imager on the Icon Mission
Stephen B. Mende,Harald U. Frey,Kodi Rider,Cathy Chou,S. Harris,O. H. W. Siegmund,Scott L. England,C. Wilkins,William W. Craig,Thomas J. Immel,Paul Turin,N. Darling,Jerôme Loicq,Pascal Blain,E. A. Syrstad,Barbara J. Thompson,R. Burt,J. Champagne,P. Sevilla,S. Ellis +19 more
TL;DR: The test and calibration program showed that ICON FUV meets its design requirements and is ready to be launched on the ICON spacecraft.
Journal ArticleDOI
Spatial distribution measurement of atomic radiation with an astigmatism-corrected Czerny-Turner-type spectrometer in the Large Helical Device
Motoshi Goto,Shigeru Morita +1 more
TL;DR: In this paper, a charge-coupled Czerny-Turner-type spectrometer based on spherical mirrors was used for collimating and focusing the visible/UV wavelength ranges with 80 lines of sight.
Journal ArticleDOI
Design of Czerny-Turner Spectrographs Using Divergent Grating Illumination
TL;DR: Czerny-Turner Spectrographs using Divergent Grating Illumination Optica Acta: International Journal of Optics: Vol 22, No 5, pp 473-475.
References
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Journal ArticleDOI
General ray-tracing procedure
Gordon Spencer,M. V. R. K. Murty +1 more
TL;DR: In this article, a vector form of the diffraction law is suggested for tracing skew rays through optical systems containing cylindrical and toric surfaces of arbitrary orientation and position, with particular attention given to the treatment of diffraction gratings.
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The Theory of the Concave Grating
TL;DR: In this article, a general theory of the irnage forrnation of the concave grating, based on Ferrnat's principle, is developed, which is used in the present paper.
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Optimization of the Czerny–Turner Spectrometer*
TL;DR: In this article, the symmetrical spherical mirror was compared to the unsymmetrical spherical-mirror Czerny-Turner spectrometer using a high blaze grating.
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Use of convergent and divergent illumination with plane gratings
TL;DR: In this paper, the properties of a plane grating when it is illuminated by a convergent or divergent wave front are investigated, and it is shown that the image principally suffers an unsymmetric aberration of coma type in the direction of dispersion.