Abstract

An autocollimator using an axicon and a beam expander telescope to generate a 12.5-cm. o.d. annular beam of helium–neon laser light with high (25:1) diameter-to-width ratio has been developed. It is used with a two-axis, electromagnetically actuated mirror assembly to acquire automatically and maintain dynamically autocollimation from a nearby but separately mounted annular mirror. The servo system controls beam alignment even though angular vibratory motions of the annular mirror make it appear to tilt relative to the autocollimator as much as 7 mrad at frequencies below 300 Hz. This paper describes the optical system and the alignment sensing and control system.

© 1975 Optical Society of America

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References

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  1. W. N. Peters, A. M. Ledger, Appl. Opt. 9, 1435 (1970) presents a mathematical discussion of this device.
    [Crossref] [PubMed]
  2. G. J. Mrus et al., Appl. Opt. 10, 504 (1971).
    [Crossref] [PubMed]

1971 (1)

1970 (1)

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Figures (9)

Fig. 1
Fig. 1

Functional block diagram of autocollimator system.

Fig. 2
Fig. 2

Simplified optical schematic.

Fig. 3
Fig. 3

Configuration of folded refraction axicon.

Fig. 4
Fig. 4

Worst case vignetting during acquisition.

Fig. 5
Fig. 5

Dynamic mirror support concept.

Fig. 6
Fig. 6

Dynamic mirror assembly.

Fig. 7
Fig. 7

Block diagram of sensor signal processing electronics (single axis).

Fig. 8
Fig. 8

Final system evaluation setup.

Fig. 9
Fig. 9

System operate loop error response.

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