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Title: Intra-Cavity Total Reflection For High Sensitivity Measurement Of Optical Properties

Abstract

An optical cavity resonator device is provided for conducting sensitive murement of optical absorption by matter in any state with diffraction-limited spatial resolution through utilization of total internal reflection within a high-Q (high quality, low loss) optical cavity. Intracavity total reflection generates an evanescent wave that decays exponentially in space at a point external to the cavity, thereby providing a localized region where absorbing materials can be sensitively probed through alteration of the Q-factor of the otherwise isolated cavity. When a laser pulse is injected into the cavity and passes through the evanescent state, an amplitude loss resulting from absorption is incurred that reduces the lifetime of the pulse in the cavity. By monitoring the decay of the injected pulse, the absorption coefficient of manner within the evanescent wave region is accurately obtained from the decay time measurement.

Inventors:
 [1]
  1. (Gaithersburg, MD)
Publication Date:
Research Org.:
DEPARTMENT OF COMMERCE
OSTI Identifier:
879560
Patent Number(s):
US 5986768
Application Number:
09/188415
Assignee:
The United States of America, as represented by the Secretary of Commerce (Washington, DC) OSTI
DOE Contract Number:  
AI07-97ER62518
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Pipino, Andrew Charles Rule. Intra-Cavity Total Reflection For High Sensitivity Measurement Of Optical Properties. United States: N. p., 1999. Web.
Pipino, Andrew Charles Rule. Intra-Cavity Total Reflection For High Sensitivity Measurement Of Optical Properties. United States.
Pipino, Andrew Charles Rule. Tue . "Intra-Cavity Total Reflection For High Sensitivity Measurement Of Optical Properties". United States. https://www.osti.gov/servlets/purl/879560.
@article{osti_879560,
title = {Intra-Cavity Total Reflection For High Sensitivity Measurement Of Optical Properties},
author = {Pipino, Andrew Charles Rule},
abstractNote = {An optical cavity resonator device is provided for conducting sensitive murement of optical absorption by matter in any state with diffraction-limited spatial resolution through utilization of total internal reflection within a high-Q (high quality, low loss) optical cavity. Intracavity total reflection generates an evanescent wave that decays exponentially in space at a point external to the cavity, thereby providing a localized region where absorbing materials can be sensitively probed through alteration of the Q-factor of the otherwise isolated cavity. When a laser pulse is injected into the cavity and passes through the evanescent state, an amplitude loss resulting from absorption is incurred that reduces the lifetime of the pulse in the cavity. By monitoring the decay of the injected pulse, the absorption coefficient of manner within the evanescent wave region is accurately obtained from the decay time measurement.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {11}
}

Patent:

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