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US 7,256,940 B2Granted
Multi-layer thin-film broadband beam splitter with matched group delay dispersion
AssigneeMassachusetts Institute of Technology
InventorsFranz X. Kaertner, Jung-Won Kim
Life of this patent
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Abstract
A beam splitter includes a substrate. A thin film layer stack is formed on the substrate to achieve the same group delay dispersion (GDD) for both reflection and transmission from any input port and output port of said beam splitter.
Claims14
A beam splitter comprising:
- a substrate;
- and
- a thin film stack that is formed on said substrate to achieve the same group delay dispersion (GDD) for both reflection and transmission from any input port and to any output port of said beam splitter, said GDD is equal to the group delay dispersion of said substrate when the group delay dispersion (GDD) for reflection from the thin film stack is matched with the GDD for a single pass in the substrate, said thin film stack comprising a multilayer structure.
A method forming a beam splitter comprising:
- providing a substrate;
- forming a thin film stack on said substrate to achieve the same group delay dispersion (GDD) for both reflection and transmission from any input port and to any output port of said beam splitter, said GDD is equal to the group delay dispersion of said substrate when the group delay dispersion (GDD) for reflection from the thin film stack is matched with the GDD for a single pass in the substrate, said thin film stack comprising a multilayer structure.
Dependencies are inferred from the claim text.