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Methods of Cavity-Enhanced Laser Absorption Spectroscopy Using Microresonator Whispering-Gallery Modes

  • A. T. Rosenberger
Chapter
Part of the Integrated Analytical Systems book series (ANASYS)

Abstract

Theoretical analysis of, and experimental results using, chemical sensing techniques based on microcavity-enhanced optical absorption are presented. Two methods are described in detail, and several extensions and enhancements of these methods are discussed briefly. Both techniques involve novel applications of tunable diode laser absorption spectroscopy in which cavity enhancement is provided by a dielectric microresonator (<1 mm in diameter) with whispering-gallery modes (WGMs) excited by tapered-fiber coupling. The evanescent component of a WGM allows for interaction with the analyte. The first method is used for the detection of trace gases in the ambient air by measuring the coupling-fiber throughput as the laser scans in frequency. Centimeter effective absorption path lengths are measured, in agreement with theory. The second method employs the observation of thermal bistability to enable measurement of absorption due to a coating applied to, or molecules adsorbed on, the microresonator's surface. Absorption by the water layer on a fused-silica surface agrees with theory, and results for thermal accommodation coefficients and thin-film absorption are also presented.

Keywords

Free Spectral Range Accommodation Coefficient Tunable Diode Laser Coupling Loss Coupling Fiber 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The following former and current students have made significant contributions to this work: Jeromy Rezac, George Farca, Siyka Shopova, Elijah Dale, and Deepak Ganta. Also contributing were these students and colleagues: Chuck Blackledge, Razvan Stoian, Michael Humphrey, Sarah Bates, Seth Koterba, Jiangquan Zhang, Brian Strecker, Donna Bandy, Bret Flanders, Lee Elizondo, Sitong Yuan, and Mike Lucas. This work was supported by the National Science Foundation under award numbers 0329924 and 0601362, by the Oklahoma Center for the Advancement of Science and Technology under award numbers AR022–052 and AR072–066, by the Oklahoma State Regents for Higher Education, and by ICx Nomadics, Inc.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • A. T. Rosenberger
    • 1
  1. 1.Department of PhysicsOklahoma State UniversityStillwaterUSA

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