Optical: systems and elements – Light interference – Electrically or mechanically variable
Patent
1994-12-05
1997-11-04
Dzierzynski, Paul M.
Optical: systems and elements
Light interference
Electrically or mechanically variable
359578, 25022718, G02B 2700
Patent
active
056846320
ABSTRACT:
In a variable wavelength optical filter, a glass plate has a curved surface on one or both sides thereof, and a dielectric multi-layer thin film formed on the curved surface. Light from the outside of the filter is transmitted through the film. The glass plate is movable perpendicularly to an optical axis by being driven by a piezoelectric actuator accommodated in a housing. By moving the glass plate, it is possible to control the angle of the film relative to the incident light and, therefore, the pass wavelength. The actuator positions the glass plate with accuracy, promoting extremely accurate wavelength control. The glass plate may be provided with a convexity on one side and a concavity on the other side which is complementary in configuration to the convexity. This reduces the wavelength dependency of the insertion loss by maintaining the optical axis of input light and that of output light in coindicence.
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Dzierzynski Paul M.
Jr. John Juba
NEC Corporation
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