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- W2023171417 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." @default.
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- W2023171417 date "1975-08-01" @default.
- W2023171417 modified "2023-10-16" @default.
- W2023171417 title "Active annular-beam laser autocollimator system" @default.
- W2023171417 cites W1985922812 @default.
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- W2023171417 doi "https://doi.org/10.1364/ao.14.001890" @default.
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