Abstract

10-cm aperture penta and penta-roof-type mirror assemblies of unusually high precision and stability for this aperture have been designed and fabricated by Perkin-Elmer Corporation. These assemblies, which are part of the internal optical alignment monitoring subsystem of a large (122-cm) aperture telescope, provide 90° deviations within ±1 sec of arc. In order to minimize degradation of the reflected wavefront due to variations of the thermal environment, each assembly is constructed of optical quality Cer-Vit mirror plates contacted to Cer-Vit blocks which establish and preserve the proper angular relationships between the reflecting surfaces. Thermal, vibration, and shock tests of prototype units have confirmed their inherent resistance to adverse environmental influences. In this paper, the method of construction of these prototype units is described and the results of various tests are given. Since the reflecting surfaces of the mirrors are dielectric coatings which maximize reflectivity in the 0.9–0.95-μ, wavelength region but have very low reflectivity at visible wavelengths, a real-time, electrooptical interferometric technique was developed for evaluating with near-infrared radiation the wavefront deformation caused by one of these assemblies. This experimental technique is also described.

© 1971 Optical Society of America

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References

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  1. Optical Design, Military Handbook MIL-HDBK-141 (Defense Supply Agency, Washington, D.C., 1962), Sec. 13.
  2. F. J. Cheshire, in A Dictionary of Applied Physics, R. Glazebrook, Ed. (Macmillan, New York, 1922), Vol. 4.
  3. F. B. Patrick, in Applied Optics and Optical Engineering, R. Kingslake, Ed. (Academic Press, New York, 1969), Vol. 5.
    [CrossRef]
  4. G. J. Mrus, W. S. Zukowsky, W. Kokot, P. R. Yoder, J. T. Wood, Appl. Opt. 10, 504 (1971).
    [CrossRef] [PubMed]

1971 (1)

Appl. Opt. (1)

Other (3)

Optical Design, Military Handbook MIL-HDBK-141 (Defense Supply Agency, Washington, D.C., 1962), Sec. 13.

F. J. Cheshire, in A Dictionary of Applied Physics, R. Glazebrook, Ed. (Macmillan, New York, 1922), Vol. 4.

F. B. Patrick, in Applied Optics and Optical Engineering, R. Kingslake, Ed. (Academic Press, New York, 1969), Vol. 5.
[CrossRef]

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Figures (8)

Fig. 1
Fig. 1

Object–image relationships of penta and roof-penta prisms.

Fig. 2
Fig. 2

Design parameters for penta and roof-penta prisms (or mirrors).

Fig. 3
Fig. 3

Optical schematic of alignment sensor using penta and roof-penta assemblies as a retroreflector.

Fig. 4
Fig. 4

10-cm aperture penta mirror assembly.

Fig. 5
Fig. 5

10-cm aperture roof-penta mirror assembly.

Fig. 6
Fig. 6

Schematic of thermal test Fizeau interferometer.

Fig. 7
Fig. 7

Schematic of infrared interferometer.

Fig. 8
Fig. 8

Typical fringe pattern of penta mirror assembly obtained with infrared interferometer.

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