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Applied Optics

Applied 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)

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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 F 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

Original Manuscript: November 17, 1999
Revised Manuscript: February 22, 2000
Published: June 1, 2000

Raffaele G. Gratton, Rajiv Bhatia, and Andrea Cavazza, "Asymmetric white-pupil collimators for high-resolution spectrographs," Appl. Opt. 39, 2614-2619 (2000)

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