Design ohne Titel (66)
Design ohne Titel (65)

Example for Laser Development

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Mechanical model

In the first step the laser device geometry is defined either directly

in Comsol or by importing it from a CAD file. It might be useful to

reduce the simulation volume with respect to symmetry planes

in order to save up computer resources and to speed up the process.


Meshing

In the next step the mesh is chosen properly depending on the

geometry of its components and the physical phenomena involved.

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Pump light propagation and absorption

Subsequently, the pump laser source needs to be implemented

in the simulation. Ray tracing can be used to propagate the pump

light and determine its absorption in the laser crystal.

Gain profile

As a result of the absorbed pump light the gain profile within

the laser crystal is determined.

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Laser light propagation and emission

In the following step, the laser light propagation inside of the laser cavity

as well as the laser beam emission is simulated by means of ray tracing.

Temperature distribution

Finally, the FEM based calculation of the  temperature distribution

resulting from heat generation and dissipation is performed.

In order to account for the influence of an inhomogeneous

temperature distribution inside of the laser crystal (thermal lensing)

on the pump and laser light, the simulation steps are repeated

in multiple iterations.

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