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Proceedings Paper

Methods for slow axis beam quality improvement of high power broad area diode lasers
Author(s): Haiyan An; Yihan Xiong; Ching-Long John Jiang; Berthold Schmidt; Georg Treusch
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Paper Abstract

For high brightness direct diode laser systems, it is of fundamental importance to improve the slow axis beam quality of the incorporated laser diodes regardless what beam combining technology is applied. To further advance our products in terms of increased brightness at a high power level, we must optimize the slow axis beam quality despite the far field blooming at high current levels. The later is caused predominantly by the built-in index step in combination with the thermal lens effect. Most of the methods for beam quality improvements reported in publications sacrifice the device efficiency and reliable output power. In order to improve the beam quality as well as maintain the efficiency and reliable output power, we investigated methods of influencing local heat generation to reduce the thermal gradient across the slow axis direction, optimizing the built-in index step and discriminating high order modes. Based on our findings, we have combined different methods in our new device design. Subsequently, the beam parameter product (BPP) of a 10% fill factor bar has improved by approximately 30% at 7 W/emitter without efficiency penalty. This technology has enabled fiber coupled high brightness multi-kilowatt direct diode laser systems. In this paper, we will elaborate on the methods used as well as the results achieved.

Paper Details

Date Published: 7 March 2014
PDF: 8 pages
Proc. SPIE 8965, High-Power Diode Laser Technology and Applications XII, 89650U (7 March 2014); doi: 10.1117/12.2040986
Show Author Affiliations
Haiyan An, TRUMPF Photonics (United States)
Yihan Xiong, TRUMPF Photonics (United States)
Ching-Long John Jiang, TRUMPF Photonics (United States)
Berthold Schmidt, TRUMPF Laser Marking Systems AG (Switzerland)
Georg Treusch, TRUMPF Photonics (United States)

Published in SPIE Proceedings Vol. 8965:
High-Power Diode Laser Technology and Applications XII
Mark S. Zediker, Editor(s)

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