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Proceedings Paper

Measurement of molecular electronic ground state oxygen O2(3sigma) in COIL device
Author(s): Frank R. Duschek; Karin M. Gruenewald; Juergen Handke; Wolfgang O. Schall
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Paper Abstract

The improvement of the efficiency of singlet oxygen generators (SOG) in chemical oxygen iodine lasers (COIL) is still a key component for optimizing the performance of these lasers. Important parameters for the SOG operation are the utilization of chlorine and the singlet oxygen yield. In this work, the singlet oxygen yield is examined by two different methods: the absorption spectroscopy of ground state molecular oxygen O2(3Σ) based on a commercial diode laser system in conjunction with a multi-pass Herriott cell, and the measurement of spontaneous emission of the O2(3Σ)-O2(1Δ) transition in the near infrared (1.27 μm). A separate calibration cell has been build with geometry identical to the diagnostic duct of the DLR COIL for exact calibration of the absorption measurement. Results of simultaneously applied emission and absorption measurements are compared. This procedure allows the determination of the radiative lifetime of O2(1Δ) to a value of 3730 s.

Paper Details

Date Published: 23 March 2005
PDF: 4 pages
Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); doi: 10.1117/12.610973
Show Author Affiliations
Frank R. Duschek, DLR Institute of Technical Physics (Germany)
Karin M. Gruenewald, DLR Institute of Technical Physics (Germany)
Juergen Handke, DLR Institute of Technical Physics (Germany)
Wolfgang O. Schall, DLR Institute of Technical Physics (Germany)

Published in SPIE Proceedings Vol. 5777:
XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Jarmila Kodymova, Editor(s)

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