Optical waveguides – Miscellaneous
Reexamination Certificate
2006-04-14
2008-05-27
Font, Frank G. (Department: 2883)
Optical waveguides
Miscellaneous
C385S012000, C356S300000, C356S402000, C356S432000, C359S278000, C359S325000, C359S326000
Reexamination Certificate
active
07379652
ABSTRACT:
Techniques for detecting optical spectral properties of a target are described. The technique includes providing an optical carrier which has an optical frequency bandwidth which is narrow compared to the width of the narrowest spectral feature of the target to be determined. This optical carrier is then electro-optically modulated with an RF frequency chirp, creating an optical chirp probe beam with a frequency chirped optical spectrum having upper and lower frequency chirped sidebands that have amplitudes sufficient to be detected at a detector. The sidebands are frequency bands arranged symmetrically around the optical carrier frequency. The attributes of a sideband include a start frequency, bandwidth and chirp rate. A probe beam is generated with the sidebands and directed onto a target having a physical property with optical frequency dependence. An optical response signal resulting from an interaction between the probe beam and the target is detected. The optical frequency dependence of the physical property of the target is determined based on the optical response signal and the attributes of the sidebands.
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Gary C. Bjorklund, Frequency-modulation Spectroscopy: A New Method for Measuring Weak Absorptions and Dispersions, Optics Letters, Jan. 1, 1980, pp. 15-17, vol. 5, No. 1, Publisher: Optical Society of America, Published in: Washington, DC USA.
Babbitt William R.
Chang Tiejun
Cole Zachary
Merkel Kristian D.
Reibel Randy R.
Evans & Molinelli PLLC
Font Frank G.
Lam Hung
Molinelli Eugene
Montana State University
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