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Proceedings Paper

Faraday isolators for high average power fundamental mode radiation
Author(s): Kolja Nicklaus; Torsten Langer
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Paper Abstract

The basic principles of faraday isolation and thermal effects in the rod geometry under high power operation have been reviewed. The temperature dependency of the verdet-constant and the magnetization of NdFeB have been identified as the limiting factor of isolation ratio for an unchilled high power isolator device. The focal shift due to the isolator with rod-geometry is independent from beam diameter and strongly depending on beam quality. A highly compact isolator for unpolarized radiation up to 400 W fundamental mode for industrial application surrounding with minimal thermal lensing has been developed. At 400 W and 10-40 °C a transmission of 95-97 %, an isolation larger 20 dB, a thermal focus shift of less than 2 rayleigh ranges and a M2 smaller than 1.2 have been achieved.

Paper Details

Date Published: 17 February 2010
PDF: 10 pages
Proc. SPIE 7578, Solid State Lasers XIX: Technology and Devices, 75781U (17 February 2010); doi: 10.1117/12.842121
Show Author Affiliations
Kolja Nicklaus, JT Optical Engine GmbH + Co. KG (Germany)
Torsten Langer, JT Optical Engine GmbH + Co. KG (Germany)

Published in SPIE Proceedings Vol. 7578:
Solid State Lasers XIX: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh K. Shori, Editor(s)

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