Spatially resolved sub-Doppler overtone gain measurements on a small-scale supersonic HF laser

Charles F. Wisniewski; Kevin B. Hewett; Gerald C. Manke II; C. Randall Truman; Gordon D. Hager

doi:10.1117/12.537755

11 May 2004 Spatially resolved sub-Doppler overtone gain measurements on a small-scale supersonic HF laser

Charles F. Wisniewski, Kevin B. Hewett, Gerald C. Manke II, C. Randall Truman, Gordon D. Hager

Proceedings Volume 5334, Gas and Chemical Lasers, and Applications III; (2004) https://doi.org/10.1117/12.537755
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

The small signal gain of a small-scale HF overtone laser was measured using a sub-Doppler tunable diode laser system. Measurements of reactant concentration, flow velocity and gain length were also made. The spatially resolved, two-dimensional small signal gain and temperature maps that were generated show a highly inhomogeneous gain medium indicating the dominant role played by mixing of the H2 and F streams in HF laser performance. The measured gain and temperature data were analyzed with the aid of a two-dimensional computational fluid dynamics model. The results show that reactant mixing mechanisms have a large effect on the gain averaged over a vertical profile while kinetic rate mechanisms, including reaction rate constants and reactant concentration, have a greater effect on the maximum system gain.

Citation Download Citation

Charles F. Wisniewski, Kevin B. Hewett, Gerald C. Manke II, C. Randall Truman, and Gordon D. Hager "Spatially resolved sub-Doppler overtone gain measurements on a small-scale supersonic HF laser", Proc. SPIE 5334, Gas and Chemical Lasers, and Applications III, (11 May 2004); https://doi.org/10.1117/12.537755

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