Optical filter which counteracts a tendency to shift optical...

Details Optical filter which counteracts a tendency to shift optical... Optical filter which counteracts a tendency to shift optical...

G - Physics

02

F

G02F 1/23 (2006.01) G02B 5/20 (2006.01) G02B 6/34 (2006.01) G02B 7/00 (2006.01)

Patent

CA 2355419

According to one aspect of the invention a light filter is provided which includes a first light filter layer and a first counteracting ring. The first light filter layer is of a filter material that transmits a selected transmission range within a wider range of wavelength of light, and reflects another selected reflection range of the wavelengths. The filter material has a refractory index, heating of the first light filter layer tending to cause an increase in refractory index with a corresponding increase in the transmission range in a first direction. The counteracting ring is circumferentially attached to the first light filter layer so that at least some of the light transmits through an aperture. Heating of the first counteracting ring causes enlargement of the first counteracting ring. The selected transmission range is thereby at least in part stabilized.

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