Terahertz White Cell for Part-Per-Million Gas Spectroscopy
Abstract
The purpose of this study was to develop a long path terahertz time-domain spectrometer for use in part-per-million level gas spectroscopy. Limitations to long propagation lengths are considered and first order, TEM00 mode, Gaussian beam theory is employed as a method of determining an optimal configuration for use at terahertz frequencies. Corrections to the first order theory are undertaken by considering the multimode nature of the beam and expanding in terms of Laguerre-Gauss beam modes. Measurements of methyl chloride and water vapor demonstrate the usefulness of the system for part-per-million detection.
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- OSU Theses [15752]