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Three-dimensional finite-difference time-domain analysis of gas ionization

Rastegarfar, H ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1109/ISTEL.2008.4651292
  3. Publisher: 2008
  4. Abstract:
  5. The propagation of intense optical beams in a gas undergoing ionization is analyzed through a threedimensional finite-difference time-domain (3D-FDTD) scheme. The propagation dynamics include the effects of diffraction, nonlinear self-focusing, and ionization. For sufficiently intense optical beams the neutral gas undergoes ionization, generating a plasma which tends to defocus the beam. Balancing of diffraction, plasma defocusing, and nonlinear self-focusing may lead to self-guided results. In this paper, necessary relations have been introduced into the conventional FDTD formulation to account for the nonlinear behaviors. Furthermore, a concurrent utilization of computer memory and disk storage helps us in expanding the simulation domain to a considerable extent. Results of various simulation scenarios are offered using our FDTD code. Simulations indicate that gas ionization has considerable effects on the propagation characteristics of intense optical beams. ©2008 IEEE
  6. Keywords:
  7. 3D FDTD ; Computer memories ; Defocus ; Defocusing ; FDTD ; FDTD codes ; Finite difference time domain analysis ; Finite difference time domains ; Gaussian profile ; Intensity ; Neutral gas ; Nonlinear behavior ; Nonlinear self-focusing ; Optical beams ; Propagation characteristics ; Propagation dynamics ; Self-focusing ; Simulation domain ; Diffraction ; Finite difference time domain method ; Focusing ; Gaussian beams ; Laser beams ; Light refraction ; Plasmas ; Refractive index ; Refractometers ; Three dimensional ; Ionization of gases
  8. Source: 2008 International Symposium on Telecommunications, IST 2008, Tehran, 27 August 2008 through 28 August 2008 ; October , 2008 , Pages 157-162 ; 9781424427512 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/4651292