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Proceedings Paper

Three-dimensional computation of laser cavity eigenmodes by the use of finite element analysis (FEA)
Author(s): Konrad Altmann; Christoph Pflaum; David Seider
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Paper Abstract

A new method for computing eigenmodes of a laser resonator by the use of finite element analysis (FEA) is presented. For this purpose, the scalar wave equation [Δ + k2]E(x,y,z) = 0 is transformed into a solvable 3D eigenvalue problem by separating out the propagation factor exp(-ikz) from the phasor amplitude E(x,y,z) of the time-harmonic electrical field. For standing wave resonators, the beam inside the cavity is represented by a two-wave ansatz. For cavities with parabolic optical elements the new approach has successfully been verified by the use of the Gaussian mode algorithm. For a DPSSL with a thermally lensing crystal inside the cavity the expected deviation between Gaussian approximation and numerical solution could be demonstrated clearly.

Paper Details

Date Published: 1 June 2004
PDF: 12 pages
Proc. SPIE 5333, Laser Resonators and Beam Control VII, (1 June 2004); doi: 10.1117/12.532578
Show Author Affiliations
Konrad Altmann, LAS-CAD GmbH (Germany)
Christoph Pflaum, Univ. Erlangen (Germany)
David Seider, Univ. Wuerzburg (Germany)

Published in SPIE Proceedings Vol. 5333:
Laser Resonators and Beam Control VII
Alexis V. Kudryashov, Editor(s)

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