Long Path Absorption Cells For Millimeter Waves

Gary G. Gimmestad; Ronald A. Bohlander

doi:10.1117/12.959644

27 February 1981 Long Path Absorption Cells For Millimeter Waves

Gary G. Gimmestad, Ronald A. Bohlander

Proceedings Volume 0259, Millimeter Optics; (1981) https://doi.org/10.1117/12.959644
Event: 1980 Huntsville Technical Symposium, 1980, Huntsville, United States

Abstract

Gasses tend to have low absorption coefficients in the millimeter wavelength region; absorption cells with path lengths of hundreds of meters are needed for millimeter wave gas-phase spectroscopy. Three types of long-path cell are discussed here: tuned cavities, untuned cavities, and optical multiple-pass cells. The operating principles of each type are described, along with the advantages and limitations of each type when used in the millimeter wavelength region. Several examples of each type of cell are given. An optical analysis of a three-mirror optical multiple-pass cell is performed, for the purpose of optimizing this cell for millimeter wave spectroscopy, with the result that a cell with mirrors one meter in diameter can give a path length of 500 meters while conserving the power from a presently available black body source.

Citation Download Citation

Gary G. Gimmestad and Ronald A. Bohlander "Long Path Absorption Cells For Millimeter Waves", Proc. SPIE 0259, Millimeter Optics, (27 February 1981); https://doi.org/10.1117/12.959644

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