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Proceedings Paper

Measurement and compensation of wavefront deformations and focal shifts in high-power laser optics
Author(s): K. Mann; B. Schäfer; M. Stubenvoll; K. Hentschel; M. Zenz
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Paper Abstract

We demonstrate the feasibility of passive compensation of the thermal lens effect in fused silica optics, placing suitable optical materials with negative dn/dT in the beam path of a high power near IR fiber laser. Following a brief overview of the involved mechanisms, photo-thermal absorption measurements with a Hartmann-Shack sensor are described, from which coefficients for surface/coating and bulk absorption in various materials are determined. Based on comprehensive knowledge of the 2D wavefront deformations resulting from absorption, passive compensation of thermally induced aberrations in complex optical systems is possible, as illustrated for an F-Theta objective. By means of caustic measurements during high-power operation we are able to demonstrate a 60% reduction of the focal shift in F-Theta lenses through passive compensation.

Paper Details

Date Published: 23 November 2015
PDF: 12 pages
Proc. SPIE 9632, Laser-Induced Damage in Optical Materials: 2015, 96321D (23 November 2015); doi: 10.1117/12.2196160
Show Author Affiliations
K. Mann, Laser-Lab. Göttingen e.V. (Germany)
B. Schäfer, Laser-Lab. Göttingen e.V. (Germany)
M. Stubenvoll, Laser-Lab. Göttingen e.V. (Germany)
K. Hentschel, Sill Optics GmbH and Co. KG (Germany)
M. Zenz, Sill Optics GmbH and Co. KG (Germany)

Published in SPIE Proceedings Vol. 9632:
Laser-Induced Damage in Optical Materials: 2015
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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