Dynamic lateral shearing interferometer
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United States of America Patent
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Dec 14, 1993
Issued Date -
N/A
app pub date -
Feb 19, 1991
filing date -
Mar 28, 1990
priority date (Note) -
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Abstract
A parallel plate lateral shearing interferometer allows the shearing plate to oscillate through a small angle periodically causing the interference fringe pattern to translate on a display surface providing an indication of the direction of adjustment required to collimate a beam. At the point of exact collimation the interference pattern changes abrubtly to a blinking pattern of dark and light. In one embodiment the shearing plate is oscillated by a new kind of electronic translator that functions by thermal expansion and contraction, and in another embodiment the shearing plate moves as a pendulum. An alternative embodiment of the translator is also provided for non-oscillatory precision translations.
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