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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 19 — Jul. 1, 2009
  • pp: 3846–3853

Broadband astigmatism-free Czerny–Turner imaging spectrometer using spherical mirrors

Dane R. Austin, Tobias Witting, and Ian A. Walmsley  »View Author Affiliations

Applied Optics, Vol. 48, Issue 19, pp. 3846-3853 (2009)

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We describe the elimination of the astigmatism of a Czerny–Turner imaging spectrometer, built using spherical optics and a plane grating, over a broad spectral region. Starting with the principle of divergent illumination of the grating, which removes astigmatism at one chosen wavelength, we obtain design equations for the distance from the grating to the focusing mirror and the detector angle that remove the astigmatism to first order in wavelength. Experimentally, we demonstrate near diffraction-limited performance from 740 to 860 nm and over a 5 mm transverse spatial extent, while ray-tracing calculations show that barring finite-aperture and detector size limitations, this range extends from 640 to 900 nm and over 10 mm transversely. Our technique requires no additional optics and uses standard off-the-shelf components.

© 2009 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6190) Spectroscopy : Spectrometers
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:

Original Manuscript: April 13, 2009
Manuscript Accepted: May 4, 2009
Published: June 30, 2009

Dane R. Austin, Tobias Witting, and Ian A. Walmsley, "Broadband astigmatism-free Czerny-Turner imaging spectrometer using spherical mirrors," Appl. Opt. 48, 3846-3853 (2009)

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