Modeling of K and Rb DPALs

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Abstract

A comprehensive three-dimensional modeling of static K diode pumped alkali laser (DPAL) and flowing-gas K and Rb DPALs is carried out. The cases of He/CH4 and pure He buffer gases are investigated and the output power and optical efficiency calculated for various pump powers, mole fractions of methane, buffer gas pressures and flow velocities. The model considers the processes of excitation of high levels of K and Rb, ionization, ion-electron recombination and heating of electrons which affect the diffusion coefficient of K and Rb ions. It explains the experimentally observed sharp increase in power in static K DPAL caused by the addition of a few percent of methane to He buffer gas and its decrease with further increase in the methane percentage [B.V. Zhdanov et al, Opt. Exp. 25, 30793 (2017)]. The predictions of the model for different He/CH4 mixtures are presented and verified by comparing them with experimental results for K flowing-gas DPAL [A. J. Wallerstein, Ph.D. dissertation (Air Force Institute of Technology, 2018)] and with the calculated results obtained using a simplified three-level model based on one-dimensional gas dynamics approach reported by A. Gavrielides et al [J. Opt. Soc. Am. B 35, 2202 (2018)].

Original languageEnglish
Title of host publicationTechnologies for Optical Countermeasures XVIII and High-Power Lasers
Subtitle of host publicationTechnology and Systems, Platforms, Effects V
EditorsD. H. Titterton, R. J. Grasso, M. A. Richardson, W. L. Bohn, H. Ackermann
PublisherSPIE
ISBN (Electronic)9781510645783
DOIs
StatePublished - 1 Jan 2021
EventTechnologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V 2021 - Virtual, Online, Spain
Duration: 13 Sep 202117 Sep 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11867
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceTechnologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V 2021
Country/TerritorySpain
CityVirtual, Online
Period13/09/2117/09/21

Keywords

  • Atomic gas lasers
  • diode-pumped lasers

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