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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 15 — May. 20, 2009
  • pp: 2871–2879

Design of freeform mirrors in Czerny–Turner spectrometers to suppress astigmatism

Li Xu, Kexin Chen, Qingsheng He, and Guofan Jin  »View Author Affiliations

Applied Optics, Vol. 48, Issue 15, pp. 2871-2879 (2009)

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Astigmatism is left uncorrected in traditional Czerny–Turner spectrometers with spherical mirrors, which leads to low throughput of modern instruments applying line-array detectors. By gradually varying the sagittal curvature, freeform mirrors are introduced to suppress astigmatism for a wide wavelength range simultaneously. So as not to reduce spectrum resolution, further calculations of the light path are performed for extra coma compensation. A design example is presented with optimized parameters. The ray-tracing result has revealed a reduction in sagittal spot size from several hundred micrometers to around 10 μm in the wavelength range from 200 nm to 800 nm .

© 2009 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(220.1000) Optical design and fabrication : Aberration compensation
(300.6190) Spectroscopy : Spectrometers

ToC Category:

Original Manuscript: February 4, 2009
Manuscript Accepted: March 22, 2009
Published: May 12, 2009

Li Xu, Kexin Chen, Qingsheng He, and Guofan Jin, "Design of freeform mirrors in Czerny-Turner spectrometers to suppress astigmatism," Appl. Opt. 48, 2871-2879 (2009)

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