Multi-channel optical filter
First Claim
1. An optical filter comprising:
- a mirror formed from q number of layers comprising a plurality of first dielectric layers having a first index of refraction, a plurality of second dielectric layers having a second index of refraction, and a composite layer having a third index of refraction that is between the first index of refraction and the second index of refraction, formed at a third layer and a q-2 layer, wherein said composite layer is formed by a high refractive index material being clad with two separate low refractive index materials;
wherein a plurality of said first dielectric layers have an integer quarter wave optical thickness and at least one of said first dielectric layers has a non-integer quarter wave optical thickness,wherein a plurality of said second dielectric layers have an integer quarter wave optical thickness and at least one of said second dielectric layers has a non-integer quarter wave optical thickness, andwherein the layers are arranged at least with layer 1 and layer q being first dielectric layers having a high index of refraction, layer 2 and layer q-1 being second dielectric layers having a low index of refraction, layer 3 and layer q-2 being third dielectric layers having an intermediate index of refraction, layer 4 and layer q-3 being second dielectric layers having the low index of refraction, and layer 5 and layer q-4 being first dielectric layers having the high index of refraction.
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Abstract
An exemplary embodiment of the invention is an optical filter including a mirror including a plurality of first dielectric layers having a first index of refraction and a plurality of second dielectric layers having a second index of refraction. A plurality of the first dielectric layers have an integer quarter wave optical thickness and at least one of the first dielectric layers has a non-integer quarter wave optical thickness. A plurality of the second dielectric layers have an integer quarter wave optical thickness and at least one of the second dielectric layers has a non-integer quarter wave optical thickness. In an exemplary embodiment, the non-integer quarter wave optical thickness first layer and the non-integer quarter wave optical thickness second layer are determined so as to enhance transmission at a predetermined wavelength.
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Citations
10 Claims
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1. An optical filter comprising:
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a mirror formed from q number of layers comprising a plurality of first dielectric layers having a first index of refraction, a plurality of second dielectric layers having a second index of refraction, and a composite layer having a third index of refraction that is between the first index of refraction and the second index of refraction, formed at a third layer and a q-2 layer, wherein said composite layer is formed by a high refractive index material being clad with two separate low refractive index materials; wherein a plurality of said first dielectric layers have an integer quarter wave optical thickness and at least one of said first dielectric layers has a non-integer quarter wave optical thickness, wherein a plurality of said second dielectric layers have an integer quarter wave optical thickness and at least one of said second dielectric layers has a non-integer quarter wave optical thickness, and wherein the layers are arranged at least with layer 1 and layer q being first dielectric layers having a high index of refraction, layer 2 and layer q-1 being second dielectric layers having a low index of refraction, layer 3 and layer q-2 being third dielectric layers having an intermediate index of refraction, layer 4 and layer q-3 being second dielectric layers having the low index of refraction, and layer 5 and layer q-4 being first dielectric layers having the high index of refraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification