Output power enhancement of an amine-based all gas-phase iodine laser by addition of methane gas

Taizo Masuda; Tomonari Nakamura; Masamori Endo

doi:10.1117/12.880234

15 November 2010 Output power enhancement of an amine-based all gas-phase iodine laser by addition of methane gas

Taizo Masuda, Tomonari Nakamura, Masamori Endo

Proceedings Volume 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 77510T (2010) https://doi.org/10.1117/12.880234
Event: 18th International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2010, Sofia, Bulgaria

Abstract

Output power enhancement of an all gas-phase iodine laser (AGIL) by addition of hydrocarbon gases is studied. It is expected because hydrocarbon gases might scavenge Cl atoms, which are strong quencher of the upper state of the laser medium, I(²P_1/2). In AGILs, suppression of the Cl atom concentration is the key to improving the efficiency of laser operation because Cl atoms are inherently generated by the self-annihilation of the energy donor, NCl(a¹Δ). We found that the addition of CH₄ gave the best results because of its high scavenging rate constant and inertness to I(²P_1/2). An enhancement of 10% was observed in the output power when CH₄ was added at a flow rate twice that of NCl₃. On the other hand, when C₂H₄ or C₂H₂ were added at the same flow rate as that of CH₄, the output power reduced despite their fast removal rate of Cl atoms. The reason for the reduced output power was that the unsaturated bonds scavenged not only the Cl atoms but also the H atoms, resulting in a low density of H atoms, and this decelerated the production of NCl(a¹Δ). The observed laser characteristics could be reasonably explained by numerical model calculations.

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Taizo Masuda, Tomonari Nakamura, and Masamori Endo "Output power enhancement of an amine-based all gas-phase iodine laser by addition of methane gas", Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 77510T (15 November 2010); https://doi.org/10.1117/12.880234

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KEYWORDS

Chemical species

Chlorine

iodine lasers

Iodine

Gases

Hydrogen

Chemical lasers

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