Optical device including a dichromatic mirror
First Claim
1. An optical device, comprising:
- a dichromatic mirror comprised of;
a vitreous substrate having a front surface and a rear surface; and
a coating provided on the vitreous substrate comprised of a three-layer stack including a semiconductor layer composed of a semiconductor material having a refractive index of more than 3.0, a layer composed of a material having an intermediate refractive index in the range 1.9 to 2.8, and a layer composed of a material having a low refractive index in the range 1.2 to 2.0,wherein the refractive indices of the materials of intermediate and low refractive index differ by at least 0.2, andwherein the dichromatic mirror has a luminous transmittance of at least 20% and a luminous reflectivity of at least 40%; and
radiation detecting means positioned on the side of the rear surface of the vitreous substrate.
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Accused Products
Abstract
An optical device includes (a) a dichromatic mirror composed of a vitreous substrate having a front surface and a rear surface; and a coating provided on the vitreous substrate composed of a three-layer stack including a semiconductor layer composed of a semiconductor material having a refractive index of more than 3.0, a layer composed of a material having an intermediate refractive index in the range 1.9 to 2.8, and a layer composed of a material having a low refractive index in the range 1.2 to 2.0, wherein the refractive indices of the materials of intermediate and low refractive index differ by at least 0.2, and wherein the dichromatic mirror has a luminous transmittance of at least 20% and a luminous reflectivity of at least 40%; and (b) radiation detecting means positioned on the side of the rear surface of the vitreous substrate. In another embodiment, the optical device includes (a) a dichromatic mirror composed of a vitreous substrate having a front surface and a rear surface; and a coating provided on the vitreous substrate composed of a three-layer stack provided in direct contact with the vitreous substrate and including a semiconductor layer composed of a semiconductor material having a high refractive index, and two other layers composed of respective materials which are different from one another and from the semiconductor layer, one of the two other layers having a refractive index of intermediate value relative to that of the semiconductor material, and another of the two other layers having a refractive index of low value relative to that of the semiconductor material, wherein the dichromatic mirror has a luminous transmittance of at least 20% and a luminous reflectivity of at least 40%; and (b) radiation detecting means positioned on the side of the rear surface of the vitreous substrate.
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Citations
19 Claims
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1. An optical device, comprising:
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a dichromatic mirror comprised of; a vitreous substrate having a front surface and a rear surface; and a coating provided on the vitreous substrate comprised of a three-layer stack including a semiconductor layer composed of a semiconductor material having a refractive index of more than 3.0, a layer composed of a material having an intermediate refractive index in the range 1.9 to 2.8, and a layer composed of a material having a low refractive index in the range 1.2 to 2.0, wherein the refractive indices of the materials of intermediate and low refractive index differ by at least 0.2, and wherein the dichromatic mirror has a luminous transmittance of at least 20% and a luminous reflectivity of at least 40%; and radiation detecting means positioned on the side of the rear surface of the vitreous substrate. - View Dependent Claims (2, 3)
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4. An optical device, comprising:
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a dichromatic mirror comprised of; a vitreous substrate having a front surface and a rear surface; and a coating provided on the vitreous substrate comprised of a three-layer stack provided in direct contact with the vitreous substrate and including a semiconductor layer composed of a semiconductor material having a high refractive index, and two other layers composed of respective materials which are different from one another and from the semiconductor layer, one of the two other layers having a refractive index of intermediate value relative to that of the semiconductor material, and another of the two other layers having a refractive index of low value relative to that of the semiconductor material, wherein the dichromatic mirror has a luminous transmittance of at least 20% and a luminous reflectivity of at least 40%; and radiation detecting means positioned on the side of the rear surface of the vitreous substrate. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification