Finite difference beam propagation model for tapered waveguide with intracavity lens

A. M. Rashed, K. A. Williams, R. V. Penty, I. H. White

Research output: Contribution to journalConference articlepeer-review

1 Citation (SciVal)


A finite difference beam propagation model is used in conjunction with laser rate equation simulations to study the inclusion of an intracavity lens in a high-power tapered ridge waveguide laser diode emitting at 980 nm. A parabolic lens is introduced in the top of the ridge near the front facet via a change in the waveguide effective refractive index profile. The inclusion of the lens has led to 13% reduction in the threshold current and an improved power slope efficiency from 0.4 W/A up to 0.8 W/A. The lens has caused near field broadening of 2 μm at full width half maximum power, indicating more efficient use of the cavity. The far filed has narrowed by 1° indicating higher brightness. The model uses a mesh for each of its points the standard carrier rate equation is solved across the active layer. The two dimensional wave equation is solved for the two counter propagating fields using a finite difference algorithm. The results of the model show good agreement with experiment.

Original languageEnglish
Pages (from-to)602-609
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Jan 2001
EventPhysics and Simulation of Optoelectronic Devices IX - San Jose, CA, USA United States
Duration: 22 Jan 200126 Jan 2001


  • Finite difference beam propagation method
  • High power laser diode
  • Tapered waveguide
  • Waveguide lens

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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