Optical filter and spectrometer
AssigneeViavi Solutions Inc.
InventorsPaula Smith, Curtis R. Hruska, Benjamin F. Catching, Paul G. Coombs
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Abstract
An optical assembly is disclosed including two laterally variable bandpass optical filters stacked at a fixed distance from each other, so that the upstream filter functions as a spatial filter for the downstream filter. The lateral displacement may cause a suppression of the oblique beam when transmission passbands at impinging locations of the oblique beam onto the upstream and downstream filters do not overlap. A photodetector array may be disposed downstream of the downstream filter. The optical assembly may be coupled via a variety of optical conduits or optical fibers for spectroscopic measurements of a flowing sample.
Claims20
An assembly comprising:
- a first filter comprising a two-dimensional array of optical filter segments;
- a second filter;
- and
- a circular polarizer, disposed between the first filter and the second filter, for suppressing light reflected from the first filter.
An assembly comprising:
- a first bandpass optical filter;
- a second bandpass optical filter;
- and
- a circular polarizer disposed between the first bandpass optical filter and the second bandpass optical filter.
An optical filter assembly comprising:
- a first filter comprising a first two-dimensional array;
- a second filter comprising a second two-dimensional array;
- and
- a circular polarizer, disposed in an optical path between the first filter and the second filter, for suppressing light in a direction towards the first filter.
Dependencies are inferred from the claim text.