Wavelength selectable optical filter
First Claim
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1. A wavelength tunable optical filter comprising two back-to-back Fabry-Perot optical cavities comprising a fixed mirror common to both cavities with parallel displaceable mirrors located one on each side of the fixed mirror to adjust the overall known length of the respective cavities.
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Abstract
A wavelength tunable optical filter 14 and a method of making the same. The optical filter 14 comprising two back-to-back Fabry-Perot optical cavities 30 & 40 comprising a fixed mirror 31 common to both cavities with parallel displaceable mirrors 32 & 42 located one on each side of the fixed mirror 31 to adjust the overall known length of the respective cavities. One optical cavity may have greater length than the other optical cavity.
148 Citations
24 Claims
- 1. A wavelength tunable optical filter comprising two back-to-back Fabry-Perot optical cavities comprising a fixed mirror common to both cavities with parallel displaceable mirrors located one on each side of the fixed mirror to adjust the overall known length of the respective cavities.
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13. A wavelength tunable optical filter comprising at least one Fabry-Perot optical cavity comprising a fixed mirror common and a displaceable mirror, the movable mirror being held in a multilayer assembly, and being secured to one layer which is separable by actuator means from a base layer.
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14. A wavelength tunable optical filter comprising at least one Fabry-Perot optical cavity comprising a fixed mirror common and a displaceable mirror, the movable mirror being held in a resilient suspension which is operable base by actuator means for displacement of the mirror.
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16. A method of manufacture of a tuneable optical filter comprising three mirror assemblies, a fixed mirror assembly and two moveable mirror assemblies, in which the three assemblies are formed separately and then assembled together with the fixed mirror assembly located between the two moveable mirror assemblies.
- 21. A method of tuning an optical wavelength filter comprising two mutually coupled Fabry-Perot optical cavities, wherein each cavity can be tuned to a particular wavelength independently of the other cavity.
Specification