Interference Cancellation for Hollow-Core Fiber Reference Cells

Jeremias Seppä, Mikko Merimaa, Mikko Merimaa, Albert Manninen, Marco Triches, Jan Hald, Antti Lassila

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    Abstract

    Doppler-free saturated absorption spectroscopy of gases in hollow-core fiber (HCF)-based cells can be used for realizing new compact, robust, and portable frequency standards. In this paper, methods for cancelling interferences resulting from the optical connections between standard fiber and HCF and other factors such as varying coupling to HCF modes are investigated. Laser power modulation with simultaneous detection of ac and dc signal is used to separate saturated absorption from interferences. In addition, a technique of two piezoelectric stack actuators stretching the fiber at different locations is described. The presented experimental results demonstrate that 99% interference attenuation is readily attainable with the techniques. Frequency comb-referenced measurement of saturated acetylene absorption features near 1.54 μm, with fiber length and power modulation, is presented. For comparison, measurements and results of the same acetylene fiber, using a system having pump and probe beams at mutually shifted frequencies, are also given.
    Original languageEnglish
    JournalI E E E Transactions on Instrumentation and Measurement
    Volume64
    Issue number4
    Number of pages5
    ISSN0018-9456
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Frequency measurement standards
    • Infrared spectra
    • Interference cancellation
    • Measurement techniques
    • Metrology
    • Optical fiber
    • Spectroscopy

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