Optical loop ring-down

Details Optical loop ring-down Optical loop ring-down

2005-01-11

2005-01-11

Kim, Ellen E. (Department: 2874)

Optical waveguides

With optical coupler

C385S012000

Reexamination Certificate

active

06842548

ABSTRACT:
The invention provides a method and apparatus for measuring one or more optical properties of a test medium, comprising providing an optical waveguide loop comprising a test medium, illuminating the optical waveguide loop with a plurality of light pulses, and detecting roundtrips of the light pulses at one or more locations along the loop, wherein the detected light pulses are indicative of one or more optical properties of the test medium. Preferably, ring-down time of said light pulses is determined. The invention provides measures of optical properties such as absorbance and refractive index of a test medium such as a gas, a liquid, and a solid material.

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