Discharge Pumped Iodine Monofluoride Laser: Operating Parameters and Collisional Kinetics
Dlabal, Michael Lawrence
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https://hdl.handle.net/2142/66261
Description
Title
Discharge Pumped Iodine Monofluoride Laser: Operating Parameters and Collisional Kinetics
Author(s)
Dlabal, Michael Lawrence
Issue Date
1981
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Optics
Language
eng
Abstract
Lasing has been observed at five different wavelengths ranging from 472 to 497 nm from discharge pumped iodine monofluoride (IF). At the optimum output coupling 4 mJ was measured in a 30 ns FWHM pulse with a peak power of 140 kW. The merits and deficiencies of both HI and CF(,3)I as iodine donors are discussed. Measurements show the small signal gain to be (GREATERTHEQ) 1% cm('-1) from (TURN) 478 to 497 nm, while much of the absorption is due to excited state of He. Limited line tunability is also demonstrated by using an internally mounted Littrow prism. Quenching measurements of the upper and lower laser level show the lower level to be removed more rapidly, thereby avoiding bottlenecking. In addition, the upper level spontaneous emission lifetime is measured to be 17.2 (+OR-) 4.0 ns. Finally studies of the formation kinetics of the upper laser level of IF have shown I*(('4)P) atoms to be an immediate precursor, while the F*(('4)P) atoms are unimportant.
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