Velocity dependence of the performance of flowing-gas K DPAL with He and He/CH4 buffer gases: 3D CFD modeling and comparison with experimental results

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Abstract

Accurate 3D computational fluid dynamics (CFD) modeling of flowing-gas K DPAL is presented, taking into account ionization and ion–electron recombination processes, ambipolar diffusion of K ions, and electron heating. Whereas in a static K DPAL with He buffer gas, the neutral K atoms in the lasing medium are depleted by these processes, the depletion can be mitigated by application of gas flow. The lowest gas velocity necessary for effective operation of a laser with He buffer is ∼500 m/s, and is much higher than previously estimated [Opt. Express 25, 30793 (2017)]. The predictions of the model for different He/CH4 mixtures are presented and verified by comparing them with experimental results obtained at the Air Force Institute of Technology [“Kinetics of higher lying potassium states after excitation of the D2 transition in the presence of helium,” dissertation (Air Force Institute of Technology, 2018)].

Original languageEnglish
Pages (from-to)2209-2214
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume37
Issue number8
DOIs
StatePublished - 1 Aug 2020

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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