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Computer-controlled Fabry-Perot interferometer for Brillouin spectroscopy.

A Asenbaum

    Applied Optics
    |March 9, 2010
    PubMed
    Summary
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    This study presents a new system for analyzing weak scattered light spectra using a Fabry-Perot interferometer. It compensates for laser frequency drifts and maintains mirror alignment for improved spectral measurements.

    Area of Science:

    • Spectroscopy
    • Optical Physics
    • Interferometry

    Background:

    • Acquiring adequate signal-to-noise ratio (SNR) for weak scattered light spectra with a Fabry-Perot interferometer requires long measurement times.
    • Laser frequency drifts and interferometer instabilities (mechanical, thermal) disrupt precise plate adjustments, affecting measurement accuracy.

    Purpose of the Study:

    • To develop a system that compensates for laser frequency drifts and maintains Fabry-Perot interferometer alignment over extended periods.
    • To enable accurate recording of weak intensity scattered light spectra by addressing common sources of error.

    Main Methods:

    • Utilized a piezoelectrically scanned Fabry-Perot interferometer.
    • Implemented a computer-controlled multichannel analyzer.
    • Employed the elastically scattered line (Rayleigh line) as a real-time reference for drift compensation and alignment stabilization.

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    Main Results:

    • The developed system effectively compensates for laser frequency drifts.
    • Parallel alignment of the interferometer mirrors is maintained over long measurement durations.
    • This approach facilitates improved SNR in weak scattered light spectral recordings.

    Conclusions:

    • The integration of a piezoelectrically scanned Fabry-Perot interferometer with a computer-controlled analyzer using Rayleigh line referencing offers a robust solution.
    • This method overcomes the limitations of long measuring times and instability issues in scattered light spectroscopy.