Method and device for recording a refractive index pattern in an optical medium
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United States of America Patent
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Sep 4, 2001
Grant Date -
N/A
app pub date -
Apr 1, 1998
filing date -
Jan 16, 1996
priority date (Note) -
Expired
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Abstract
A device for recording a refractive index pattern in a photosensitive optical fiber includes a rotary disc formed with a phase mask in a circular pattern, which is rotated by an axis. The phase mask is illuminated with laser light in a region so that a moving interference pattern is formed. The optical fiber is moved along a path in synchronism with the moving interference pattern so that the pattern becomes recorded in the fiber. The pattern can be formed continuously over long fiber lengths, e.g., of the order of one meter.
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