Miniaturization of gradient index lens used in optical components
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United States of America Patent
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Jul 11, 2000
Grant Date -
N/A
app pub date -
Dec 22, 1998
filing date -
Dec 22, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
GRIN lenses are made by an ion/exchange process. In order to make a GRIN lens whose gradient index varies slowly radially, a cylindrical glass rod of a sufficiently large diameter is immersed in a salty bath. The size of the lens may be reduced by grinding, polishing or chemically etching away a peripheral optically dispensable portion of the lens away from the axis of the lens so that the outer diameter of the lens is as small as 0.8 millimeters. When such a smaller lens is used in optical components such as circulators, switches, WDM's and isolators, such optical devices would also be reduced in size to fit within a limited space.
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