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 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

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References

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  1. A. Baranne, “Equipment Spectrographique du Foyer Coude du Telescope de 3.60 metres,” in ESO/CERN Conference on Auxiliary Instrumentation for Large Telescopes, eds. S. Laustsen, A. Reiz, eds., European Southern Observatory-CERN, Geneve, 1972), pp. 227–239.
  2. H. Dekker, S. D’Odorico, “UVES, the UV-Visual echelle spectrograph for the VLT,” Messenger 70, 13–16 (1992).
  3. R. G. Tull, P. J. McQueen, C. Sneden, D. L. Lambert, “The high-resolution cross-dispersed echelle white-pupil spectrometer of the McDonald Observatory 2.7-m telescope,” Publ. Astron. Soc. Pac. 107, 251–264 (1995).
    [CrossRef]
  4. D. W. Schroeder, Astronomical Optics (Academic, San Diego, Calif., 1987).

1995 (1)

R. G. Tull, P. J. McQueen, C. Sneden, D. L. Lambert, “The high-resolution cross-dispersed echelle white-pupil spectrometer of the McDonald Observatory 2.7-m telescope,” Publ. Astron. Soc. Pac. 107, 251–264 (1995).
[CrossRef]

1992 (1)

H. Dekker, S. D’Odorico, “UVES, the UV-Visual echelle spectrograph for the VLT,” Messenger 70, 13–16 (1992).

Baranne, A.

A. Baranne, “Equipment Spectrographique du Foyer Coude du Telescope de 3.60 metres,” in ESO/CERN Conference on Auxiliary Instrumentation for Large Telescopes, eds. S. Laustsen, A. Reiz, eds., European Southern Observatory-CERN, Geneve, 1972), pp. 227–239.

D’Odorico, S.

H. Dekker, S. D’Odorico, “UVES, the UV-Visual echelle spectrograph for the VLT,” Messenger 70, 13–16 (1992).

Dekker, H.

H. Dekker, S. D’Odorico, “UVES, the UV-Visual echelle spectrograph for the VLT,” Messenger 70, 13–16 (1992).

Lambert, D. L.

R. G. Tull, P. J. McQueen, C. Sneden, D. L. Lambert, “The high-resolution cross-dispersed echelle white-pupil spectrometer of the McDonald Observatory 2.7-m telescope,” Publ. Astron. Soc. Pac. 107, 251–264 (1995).
[CrossRef]

McQueen, P. J.

R. G. Tull, P. J. McQueen, C. Sneden, D. L. Lambert, “The high-resolution cross-dispersed echelle white-pupil spectrometer of the McDonald Observatory 2.7-m telescope,” Publ. Astron. Soc. Pac. 107, 251–264 (1995).
[CrossRef]

Schroeder, D. W.

D. W. Schroeder, Astronomical Optics (Academic, San Diego, Calif., 1987).

Sneden, C.

R. G. Tull, P. J. McQueen, C. Sneden, D. L. Lambert, “The high-resolution cross-dispersed echelle white-pupil spectrometer of the McDonald Observatory 2.7-m telescope,” Publ. Astron. Soc. Pac. 107, 251–264 (1995).
[CrossRef]

Tull, R. G.

R. G. Tull, P. J. McQueen, C. Sneden, D. L. Lambert, “The high-resolution cross-dispersed echelle white-pupil spectrometer of the McDonald Observatory 2.7-m telescope,” Publ. Astron. Soc. Pac. 107, 251–264 (1995).
[CrossRef]

Messenger (1)

H. Dekker, S. D’Odorico, “UVES, the UV-Visual echelle spectrograph for the VLT,” Messenger 70, 13–16 (1992).

Publ. Astron. Soc. Pac. (1)

R. G. Tull, P. J. McQueen, C. Sneden, D. L. Lambert, “The high-resolution cross-dispersed echelle white-pupil spectrometer of the McDonald Observatory 2.7-m telescope,” Publ. Astron. Soc. Pac. 107, 251–264 (1995).
[CrossRef]

Other (2)

D. W. Schroeder, Astronomical Optics (Academic, San Diego, Calif., 1987).

A. Baranne, “Equipment Spectrographique du Foyer Coude du Telescope de 3.60 metres,” in ESO/CERN Conference on Auxiliary Instrumentation for Large Telescopes, eds. S. Laustsen, A. Reiz, eds., European Southern Observatory-CERN, Geneve, 1972), pp. 227–239.

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