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Optical design and analysis of a two-spherical-mirror-based multipass cell.
Applied Optics
|April 1, 2020
Summary
A new optical design method for multipass cells (MPCs) creates compact, long-path-length systems. These optimized multipass cells are ideal for sensitive trace gas sensing applications.
Area of Science:
- Optical Engineering
- Spectroscopy
- Trace Gas Sensing
Background:
- Multipass cells (MPCs) enhance light-matter interaction for sensitive measurements.
- Traditional MPC designs can be bulky and complex.
Purpose of the Study:
- To present a systematic method for designing and analyzing two-spherical-mirror multipass cells (MPCs).
- To explore how varying design parameters influences pattern formation and performance.
- To demonstrate the suitability of these MPCs for trace gas sensing.
Main Methods:
- Systematic optical design and analysis of two-spherical-mirror MPCs.
- Parameter variation including mirror distance, incident point, and angles.
- Fabrication and analysis of three exemplary MPCs with distinct mirror patterns.
Main Results:
- Demonstrated ability to form various dense patterns (circles, triangles, petals) on mirrors.
- Comparative analysis of MPCs based on volume, optical path length (OPL), reflections, and spot stability.
- Identified superior characteristics including compactness, long effective OPL, and cost-effectiveness.
Conclusions:
- The presented systematic method enables efficient design of compact, high-performance MPCs.
- Optimized MPCs offer a long effective optical path length suitable for sensitive detection.
- These cost-effective MPCs are well-suited for trace gas sensing applications.
