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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Laser Physics

    Background:

    • Multipass absorption cells are crucial for sensitive gas detection.
    • Large-numerical-aperture cells face challenges with accumulated aberrations from off-axis reflections.
    • Previous designs have not significantly advanced large-numerical-aperture multipass cell performance.

    Purpose of the Study:

    • To modify Chernin's multipass cell design for improved performance.
    • To reduce system volume and eliminate alignment difficulties.
    • To develop a generalized design routine for user-specific requirements.

    Main Methods:

    • Modified Chernin's four-objective multipass matrix cell using slicer mirrors.
    • Employed automatic modeling tools (Pyzdde) integrated with Zemax.
    • Defined boundary conditions for parameter selection and performed tolerance analysis.

    Main Results:

    • Achieved a high path-to-volume ratio (PVR) of 67.5 m/L.
    • Obtained low wavefront errors with a peak-to-valley value of 0.92 μm.
    • Demonstrated a design with 108 passes in a 300 mm base length.

    Conclusions:

    • The modified design effectively overcomes aberrations in large-numerical-aperture multipass cells.
    • The proposed design routine facilitates easy achievement of high PVR and low-aberration beams.
    • This advancement offers potential for improved response time and detection sensitivity in optical absorption applications.