Chip Design

The Chip Design group deals with the design of semiconductor devices as soon as optical beam forming systems and mountings with a special focus on:

  • Development and maintenance of software tools
  • Education and training
  • Performance of simulations and analysis of experimental results
  • Lateral far-field profiles of broad area lasers
    [+] Calculated, spectrally resolved lateral far-field profiles of gain-guided (l.) and index-guided broad area lasers
  • Three-dimensional simulation of beam shaping
    [+] Three-dimensional simulation of beam shaping using WinABCD

Simulation of diode lasers, amplifiers and modulators

Simulated and measured characteristics
Simulated and measured characteristics

Tasks

  • Vertical layer structures and lateral waveguiding
  • Coupling strength and reflectivity of Bragg gratings
  • Thermal lensing
  • CW and pulsed electro-optical characteristics
  • Dynamical behavior and spectral characteristics
  • Modulation efficiency

Tools

  • kp8, QIP, DFB, CME, FIT, CAMFR
    In-house developments or public domain, reduced models, fast
  • WIAS-TeSCA, -LDSL, -BALaser
    Semi-commercial, accurate models, sophisticated numerics
  • LASTIP, FIMMWAVE/FIMMPROP
    Commercial, complex models, user-friendly

Simulation of beam shaping optics

Two-dimensional simulation of beam shaping
Two-dimensional simulation of beam shaping using WinABCD

Tasks

  • Beam collimation
  • Fiber coupling
  • Beam forming in MOPA, ECDL and SHG systems
  • Design of tailored micro lenses based on measured beam propagation parameter or Wigner distributions

Tools

  • WINABCD 2D und 3D paraxial approximations, propagation of (local) second order beam parameters, user-friendly and fast - the 3D version will soon be marketed and distributed as “BeamXpert Designer” by an FBH spin-off (in the course of formation).
  • ZEMAX-EENon-sequential raytracing, modeling of beams as Schell-Gaussian ray bundles, quantitative analysis of aberrations
  • Wigner distribution

    Model for general partially coherent beams, non-interferometric measurement  (similar as M2-measurement)