Infrared NO(v=2 1) laser pumped by energy transfer from Br(2P1/2)

Ray O. Johnson; Glen P. Perram; Won B. Roh; Michael R. Hawks

doi:10.1117/12.204962

31 March 1995 Infrared NO(v=2 1) laser pumped by energy transfer from Br(2P1/2)

Ray O. Johnson, Glen P. Perram, Won B. Roh, Michael R. Hawks

Proceedings Volume 2502, Gas Flow and Chemical Lasers: Tenth International Symposium; (1995) https://doi.org/10.1117/12.204962
Event: Gas Flow and Chemical Lasers: Tenth International Symposium, 1994, Friedrichshafen, Germany

Abstract

Pulsed photodissociation of iodine monobromide at 532 nm provides a high yield of spin-orbit excited atomic bromine. Near resonant electronic-to-vibrational energy transfer from Br(²P_1/2) to NO(v equals 2) is rapid, k equals 2.4 X 10^-12 cm³/molecule-s, and selective, with a branching ratio of NO(v equals 2) of 0.89 +/- 0.21. An NO(v equals 2 yields 1) laser operating at 5.4 microns was demonstrated at NO pressures from 0.1 - 1.4 Torr. Temporal profiles were obtained as a function of IBr and No pressures and photolysis energy to analyze laser gain, threshold, and efficiency. The threshold photolysis pump energy was 25 mJ/pulse. Lasing pulses were delayed by 150 ns from photodissociation and persisted for 100 - 200 ns. Device efficiency is limited by NO V yields V relaxation, and the maximum observed NO laser energy was 0.01 mJ for 85 mJ photolysis energy. Comparison to similar Br(²P_1/2 yields ²P_3/2) and Br(²P_1/2)/CO₂(101 - yields 100) is provided.

Citation Download Citation

Ray O. Johnson, Glen P. Perram, Won B. Roh, and Michael R. Hawks "Infrared NO(v=2 1) laser pumped by energy transfer from Br(2P1/2)", Proc. SPIE 2502, Gas Flow and Chemical Lasers: Tenth International Symposium, (31 March 1995); https://doi.org/10.1117/12.204962

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