Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2006-04-06
2008-11-04
Turner, Samuel A (Department: 2877)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
C356S519000
Reexamination Certificate
active
07446880
ABSTRACT:
A method and apparatus for performing refractive index, birefringence and optical activity measurements of a material such as a solid, liquid, gas or thin film. The apparatus has an optical ring-resonator with a closed optical path that constitutes a cavity. A sample is introduced into the optical path of the resonator such that the light in the resonator is transmitted through the sample and relative and/or absolute shifts of the resonance frequencies or changes of the characteristics of the transmission spectrum are observed. A change in the transfer characteristics of the resonant ring, such as a shift of the resonance frequency, is related to a sample's refractive index (refractive indices) and/or change thereof. A reflecting surface may be introduced in a ring resonator. The reflecting surface can be raster-scanned for the purpose of height-profiling surface features.
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Fischer Peer
Vollmer Frank
24IP Law Group USA
DeWitt Timothy R.
President and Fellows of Harvard College
Turner Samuel A
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