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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 16 — Jun. 1, 2000
  • pp: 2614–2619

Asymmetric White-Pupil Collimators for High-Resolution Spectrographs

Raffaele G. Gratton, Rajiv Bhatia, and Andrea Cavazza  »View Author Affiliations


Applied Optics, Vol. 39, Issue 16, pp. 2614-2619 (2000)
http://dx.doi.org/10.1364/AO.39.002614


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Abstract

We present the optical principle of a white-pupil collimator made up of two mirrors with unequal focal lengths. Analytic formulas for third-order aberrations are derived and compared with the results of ray-tracing experiments. It is shown that the image quality is good if the second mirror has a suitable conic coefficient and the <i>F</i> ratio is not too small. Furthermore, third-order coma and astigmatism can be zeroed simultaneously if the angles are also appropriately selected. When implemented in high-resolution echelle spectrographs, this design permits smaller cross dispersers and cameras, with considerable savings in cost.

© 2000 Optical Society of America

OCIS Codes
(120.1680) Instrumentation, measurement, and metrology : Collimation
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(220.1000) Optical design and fabrication : Aberration compensation

Citation
Raffaele G. Gratton, Rajiv Bhatia, and Andrea Cavazza, "Asymmetric White-Pupil Collimators for High-Resolution Spectrographs," Appl. Opt. 39, 2614-2619 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-16-2614

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