PLaSK User Manual

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<gain solver="FreeCarrierCyl">

Corresponding Python class: gain.freecarrier.FreeCarrierCyl.

Quantum-well gain using free-carrier approximation for cylindrical geometry.

This solver does not use any mesh by default and the the full gain calculation is performed in each requested point. However, if there is a mesh specified then the gain is computed only in the mesh points and interpolated in-between.

  • name (required) – Solver name.

Geometry for use by this solver.

  • ref (required) – Name of a Cylindrical geometry defined in the <geometry> section.

Optional Ordered, Regular mesh used by this solver.

  • ref (required) – Name of a Ordered, Regular mesh defined in the <grids> section.

Some important gain parameters.

  • lifetime – Average carriers lifetime. This parameter is used for gain spectrum broadening. (float [ps], default 0.1 ps)
  • matrix-elem – Value of the squared matrix element in gain computations. If it is not set it is estimated automatically. (float [eV×m0])
  • strained – Boolean attribute indicating if the solver should consider strain in the active region. If set to yes then there must a layer with the role “substrate” in the geometry. The strain is computed by comparing the atomic lattice constants of the substrate and the quantum wells. (bool, default is ‘no’)
  • T0 – Reference temperature. This is the temperature used for initial computation of the energy levels. (float [K], default 300 K)