Comparison of semi-analytical to CFD model calculations and to experimental results of subsonic flowing-gas and static DPALs

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Abstract

Comparison between a semi-analytical and two- and-three dimensional computational fluid dynamics (2D and 3D CFD) models is reported. The models take into account effects of temperature rise and losses of alkali atoms due to ionization and chemical reactions, resulting in a decrease of the slope efficiency and lasing power. Effects of natural convection in static DPALs are also taken into account. Both models are applied to Cs DPALs and the results are in good agreement with measurements in a static [B.V. Zhdanov, J. Sell and R.J. Knize, Electron. Lett. 44, 582 (2008)] and 1-kW flowing-gas [A.V. Bogachev et al., Quantum Electron. 42, 95 (2012)] DPALs. Comparison of the models applied to the flowing-gas DPAL shows that for low pump power both models predict very close values of the laser power; however, at higher pump power, corresponding to saturation of the absorption of the pump transition, the values of the laser power calculated using the 2D CFD model are much higher than those obtained using the semi-analytical model.

Original languageEnglish
Title of host publicationTechnologies for Optical Countermeasures XI; and High-Power Lasers 2014
Subtitle of host publicationTechnology and Systems
EditorsRobert J. Grasso, Mark A. Richardson, David H. Titterton, Willy L. Bohn, Harro Ackermann
PublisherSPIE
ISBN (Electronic)9781628413144
DOIs
StatePublished - 1 Jan 2014
EventTechnologies for Optical Countermeasures XI; and High-Power Lasers 2014: Technology and Systems - Amsterdam, Netherlands
Duration: 22 Sep 201425 Sep 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9251
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceTechnologies for Optical Countermeasures XI; and High-Power Lasers 2014: Technology and Systems
Country/TerritoryNetherlands
CityAmsterdam
Period22/09/1425/09/14

Keywords

  • Diode pumping
  • Gas flows
  • Gas lasers

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