Optimization and parametric analysis of circular multi-pass cells for enhanced optical absorption path-length
JAPANESE JOURNAL OF APPLIED PHYSICS, vol.65, no.15, 2026 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 65 Issue: 15
- Publication Date: 2026
- Doi Number: 10.35848/1347-4065/ae942b
- Journal Name: JAPANESE JOURNAL OF APPLIED PHYSICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC
- Open Archive Collection: AVESIS Open Access Collection
- Çanakkale Onsekiz Mart University Affiliated: Yes
Abstract
This study optimizes the geometric parameters of a circular multi-pass cell (CMPC) to maximize optical absorption path-length using a Taguchi L27 orthogonal array. Three control factors-inner cell radius (R), number of vertices (p), and star polygon density (q)-were evaluated through Signal-to-Noise ratio and ANOVA. Results identify cell radius as the dominant factor, contributing 85.64% to the total variance, followed by p (7.06%) and q (4.49%). A significant interaction between R and p (P = 0.045) indicates a synergistic effect on beam trajectory. A linear regression model was developed and validated through methane direct absorption spectroscopy at 1651 nm. The experimental path-length deviated by less than 0.5% from the 88.3 m theoretical prediction. These findings provide a robust framework for optimizing CMPC designs in high-sensitivity trace gas detection by precisely quantifying the complex relationships among geometric parameters.