Intra-cavity total reflection for high sensitivity measurement o

Details Intra-cavity total reflection for high sensitivity measurement o Intra-cavity total reflection for high sensitivity measurement o

1997-10-31

1999-08-24

Kim, Robert H.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356439, G01N 2100

Patent

active

059431369

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.

REFERENCES:
patent: 5437840 (1995-08-01), King et al.
patent: 5528040 (1996-06-01), Lehmann

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