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Proceedings Paper

3D ray tracing model for laser beams influenced by thermal lensing in solid-state gain media
Author(s): Phillip Lino Rall; Ramon Springer; Christoph Pflaum
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Paper Abstract

A ray tracing model for thermal effects solid-state single-pass amplifiers is presented, which is able to simulate thermal lensing, depolarization and beam quality degradation. The ray tracing algorithm is based on alternatively evaluating the axial and radial gradient and thereby finding the trajectory in thermally influenced media. This enables to find the focal length distribution of the system. Additionally, to the position of the rays, its phase is also determined, which enables to reconstruct the wavefront of the beam after passing through the crystal. This wavefront is used for a Zernike polynomial analysis to determine spherical aberration, which is linked to the beam quality of the passing beam. Furthermode the total depolarization is obtained by finding the change of polarization for each ray separately. The simulation for thermal lensing is compared with a single-pass Nd:YVO4 system, the beam degradation is compared with a Nd:YVO4-MOAP system. Both show good agreement with the simulation data, as long as the gain of the system is homogeneous.

Paper Details

Date Published: 29 May 2018
PDF: 13 pages
Proc. SPIE 10694, Computational Optics II, 106940S (29 May 2018); doi: 10.1117/12.2311840
Show Author Affiliations
Phillip Lino Rall, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Erlangen Graduate School in Advanced Optical Technologies (Germany)
Ramon Springer, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Erlangen Graduate School in Advanced Optical Technologies (Germany)
Christoph Pflaum, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)

Published in SPIE Proceedings Vol. 10694:
Computational Optics II
Daniel G. Smith; Frank Wyrowski; Andreas Erdmann, Editor(s)

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