CFD assisted simulation of temperature distribution and laser power in pulsed and CW pumped static gas DPALs

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

15 Scopus citations

Abstract

An analysis of radiation, kinetic and fluid dynamic processes in diode pumped alkali lasers (DPALs) is reported. The analysis is based on a three-dimensional, time-dependent computational fluid dynamics (3D CFD) model. The CFD code which solves the gas conservation equations includes effects of natural convection and temperature diffusion of the species in the DPAL mixture. The gas flow conservation equations are coupled to the equations for DPAL kinetics and to the Beer-Lambert equations for pump and laser beams propagation. The DPAL kinetic processes in the Cs/CH4 (K/He) gas mixtures considered involve the three low energy levels, (1) n2S1/2, (2) n2P3/2 and (3) n2P1/2 (where n=4,6 for K and Cs, respectively), three excited alkali states and two alkali ionic states. Using the CFD model, the gas flow pattern and spatial distributions of the pump and laser intensities in the resonator were calculated for end-pumped CW and pulsed Cs and K DPALs. The DPAL power and medium temperature were calculated as a function of pump power and pump pulse duration. The CFD model results were compared to experimental results of Cs and K DPALs.

Original languageEnglish
Title of host publicationTechnologies for Optical Countermeasures XII; and High-Power Lasers 2015
Subtitle of host publicationTechnology and Systems
EditorsWilly L. Bohn, David H. Titterton, Mark A. Richardson, Robert J. Grasso, Harro Ackermann
PublisherSPIE
ISBN (Electronic)9781628418606
DOIs
StatePublished - 1 Jan 2015
EventTechnologies for Optical Countermeasures XII; and High-Power Lasers 2015: Technology and Systems - Toulouse, France
Duration: 21 Sep 201524 Sep 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9650
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceTechnologies for Optical Countermeasures XII; and High-Power Lasers 2015: Technology and Systems
Country/TerritoryFrance
CityToulouse
Period21/09/1524/09/15

Keywords

  • Atomic gas lasers
  • Buoyancy
  • Diode pumped lasers
  • Laser theory
  • Thermal effects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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