Population Density Measurements of the Excited States of an Optically Excited Argon Discharge Using Emission and Absorption Spectroscopy
Technical Report,01 Oct 2014,24 Mar 2016
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH WRIGHT-PATTERSON AFB United States
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The populations of the excited argon 2s23p54s s5 only and 3s23p54p configurations in a 10 W radio frequency discharge has been studied using optical emission and diode laser absorption spectroscopy. by optically bleaching the s5- p9 transition with a narrow band laser pump of about 10 Wcm2 at 811nm, the p9 population was increased by about a factor of 2 at a pressure of 5 Torr. At higher pressure, collisional mixing to adjacent p-states limited the laser-increased p9 population to less than 10 percent. All other laser-induced p-state populations were minimally affected at low pressure and increased by about a factor of 4 at higher pressure. The low pressure absorption line shapes exhibited an inhomogeneous hole with band-integrated absorbance that scaled linearly with pump power. The s5 population was greater than 71011 cm-3 at a pressure of 5 Torr, and about 57 percent of this population was moved to the p9 state at 828 mW, or about 10 Wcm2. Implications for development of a higher power optically pumped rare gas laser are discussed.
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