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Related Experiment Video

Updated: Jun 7, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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Astigmatic mirror multipass absorption cells for long-path-length spectroscopy.

J B McManus, P L Kebabian, M S Zahniser

    Applied Optics
    |November 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an astigmatic multipass absorption cell for long path lengths in small volumes. Mirror rotation allows for precise optical path adjustments, enhancing spectroscopy applications.

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    Area of Science:

    • Optics and Spectroscopy
    • Physical Chemistry

    Background:

    • Long path length absorption cells are crucial for sensitive gas analysis.
    • Traditional designs often require large volumes or highly precise components.

    Purpose of the Study:

    • To design and validate a novel multipass absorption cell with enhanced adjustability and compactness.
    • To enable long optical path lengths within small, manageable volumes for spectroscopic applications.

    Main Methods:

    • Development of an astigmatic variant of the off-axis resonator (Herriott) configuration.
    • Utilizing mirror axis rotation to achieve effective adjustability in mirror radii and compensate for manufacturing errors.
    • Analysis of beam trajectories to map accessible reentrant patterns and path lengths based on mirror rotation and separation.

    Main Results:

    • Demonstrated compensation for mirror radius errors using mirror rotation, enabling desired reentrant patterns with less precise optics.
    • Achieved a variety of path lengths and reentrant patterns with a fixed set of astigmatic mirrors.
    • Successfully designed and tested prototype cells: a 100-m path length in 3 L and a 36-m path length in 0.3 L.

    Conclusions:

    • The astigmatic multipass absorption cell with mirror rotation offers a versatile and effective solution for achieving long optical paths in small volumes.
    • The developed techniques are validated by prototype testing and show promise for applications like fast-flow atmospheric sampling.