Optical sensor utilizing rare-earth-doped integrated-optic laser

Details Optical sensor utilizing rare-earth-doped integrated-optic laser Optical sensor utilizing rare-earth-doped integrated-optic laser

1995-05-30

1997-10-14

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

372 7, 385 12, 356328, G01N 2127

Patent

active

056777698

ABSTRACT:
An integrated-optic sensor includes a waveguide made from a substrate that is doped with rare-earth elements. A beam of light propagating along the waveguide excites these elements, causing them to emit light and thereby increase the total amount of light being propagated in the waveguide. The waveguide itself functions as a laser, so that any change in an optical property of an analyte material which forms a portion of the laser cavity can affect the operation of the laser. Consequently, the wavelength or power of light produced by the laser changes, in direct response to changes in the concentration of a material being sensed, and these changes are enhanced due to the inherent gain characteristics of the laser media.

REFERENCES:
patent: 4815843 (1989-03-01), Tiefenthaler et al.
patent: 5280172 (1994-01-01), Di Bin et al.
patent: 5317576 (1994-05-01), Leonberger et al.
patent: 5452084 (1995-09-01), Mitchell et al.

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