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12 May 2008 Collisional quenching and radiation trapping kinetics for Rb(5p) in the presence of ethane
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Proceedings Volume 7005, High-Power Laser Ablation VII; 700522 (2008)
Event: High-Power Laser Ablation 2008, 2008, Taos, New Mexico, United States
Optically pumped alkali vapor lasers have been constructed using excitation of the D2 line (2P3/2-2S1/2) followed by lasing on the D1 line (2P1/2-2S1/2). Collisional relaxation is used to transfer population from 2P3/2 to the 2P1/2 level. The collision partner used for this step must have a large cross section for inducing transfer between the 2PJ levels, combined with a very small cross section for electronic quenching of the form M(2PJ)+Q→M(2S1/2)+Q (where M is an alkali metal and Q is the energy transfer agent). Ethane has proved to be an effective energy transfer agent for optically pumped Rb and Cs lasers. However, modeling of data for the Rb/C2H6 laser with the literature value for the quenching rate constant was unsuccessful. We have reexamined the quenching of Rb(2PJ) by C2H6 using time-resolved fluorescence techniques. Radiation trapping was significant under the conditions of our measurements, and an analysis of the interplay between the kinetics of trapping and quenching was carried out. It was found that quenching of Rb(2PJ) by C2H6 was very inefficient. The upper bound established for the quenching cross section was two orders of magnitude lower than that indicated by the previous determination.
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David A. Hostutler, Gordon D. Hager, and Michael C. Heaven "Collisional quenching and radiation trapping kinetics for Rb(5p) in the presence of ethane", Proc. SPIE 7005, High-Power Laser Ablation VII, 700522 (12 May 2008);

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