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US 2019/0195615 A1Published application
Cascade fourier domain optical coherence tomography
AssigneeUniversity of Rochester
InventorsDi Xu, Jannick Rolland-Thompson
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Abstract
A cascaded interferometric system for Fourier domain optical coherence tomography (OCT) in which the output of one sub-system interferometer is directed through a second sub-system interferometer for performing the Fourier transform in hardware.
Claims21
A cascade Fourier domain optical coherent tomography interferometer system comprising:
- a first sub-system interferometer arranged for scanning a sample relative to a reference surface with a broadband source beam for generating a first level output beam based on interference between a portion of the source beam returning from the sample and another portion of the source beam returning from the reference surface;
- a second sub-system interferometer that splits the first level output beam from the first sub-system interferometer into two further beam portions and varies relative optical path lengths of the two further beam portions over time before recombining the two further beam portions into a second level output beam that is directed to a detector;
- and
- a processor arranged for converting detected values of the second level output beam associated with the variations in relative optical path lengths of the two further beam portions into a measurement of the sample.
1 more element
A method of measuring a sample with a cascade Fourier domain optical coherent tomography interferometer system comprising steps of:
- scanning a sample relative to a reference surface with a broadband source beam with a first sub-system interferometer;
- generating a first level output beam based on interference between a portion of the source beam returning from the sample and another portion of the source beam returning from the reference surface;
- splitting the first level output beam from the first sub-system interferometer with a second sub-system interferometer into two further beam portions;
- varying relative optical path lengths of the two further beam portions over time with the second sub-system interferometer before recombining the two further beam portions into a second level output beam that is directed to a detector;
- and
- converting detected values of the second level output beam associated with the variations in relative optical path lengths of the two further beam portions into a measurement of the sample.
3 more elements
Dependencies are inferred from the claim text.