Wide-band multilayer interference filter
First Claim
1. A wide-band multilayer interference filter in which the stopbands of higher order are partly suppressed, comprising a filter having a periodic arrangement of layers of the structure ABCDDCBA, where A,B,C,D indicate individual layers having each an optical thickness of one-fourth of the predetermined constructional wavelength and the mutually different refraction indices of said layers fulfill the following conditions:
- y2 - 2y. x2 - x + 1/x + 1 0 where x nA/nB y nB/nC and nA nD nB nC
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Abstract
A wide-band multilayer interference filter comprises a filter having a periodic arrangement of layers of the structure ABCDDCBA, where A,B,C,D indicate individual layers having each an optical thickness of one-fourth of the predetermined constructional wavelength and the mutually different refraction indices of said layers fulfill the following conditions:
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Citations
8 Claims
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1. A wide-band multilayer interference filter in which the stopbands of higher order are partly suppressed, comprising a filter having a periodic arrangement of layers of the structure ABCDDCBA, where A,B,C,D indicate individual layers having each an optical thickness of one-fourth of the predetermined constructional wavelength and the mutually different refraction indices of said layers fulfill the following conditions:
- y2 - 2y. x2 - x + 1/x + 1 0 where x nA/nB y nB/nC and nA nD nB nC
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2. A wide-band multilayer interference filter according to claim 1, wherein the stRuctural sequence ABCDDCBA in the layer system recurrs at least three times.
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3. A wide-band multilayer interference filter according to claim 1, wherein the refractive indices of the layers are:
- nA 1.46 nB 1.68 nC 2.04 nD 2.35
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4. A wide-band multilayer interference filter according to claim 1, wherein the refractive indices of the layers are:
- nA 1.38 nB 1.55 nC 1.83 nD 2.05
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5. A wide-band multilayer interference filter according to claim 1, wherein the refractive indices of the layers are:
- nA 1.80 nB 2.31 nC 3.28 nD 4.20.
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6. A wide-band multilayer interference filter according to claim 1, wherein the layers A are made of SiO2, the layers B are made of Al2O3, the layers C are made of ZrO2, the layers D are made of TiO2.
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7. A wide-band multilayer interference filter according to claim 1, wherein the layers A are made of MgF2, the layers B are made of ThF4, the layers C are made of La2O3, the layers D are made of ZrO2.
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8. A wide-band multilayer interference filter according to claim 1, wherein the layers A are made of SiO2, the layers B are made of ZnS, the layers C are made of Si, and the layers D are made of Ge.
Specification