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Proceedings Paper

Advances in high power and high brightness laser bars with enhanced reliability
Author(s): Haiyan An; Ching-Long (John) Jiang; Yihan Xiong; Aloysius Inyang; Qiang Zhang; Alexander Lewin; Stephan Strohmaier; Georg Treusch
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Paper Abstract

The advances in laser-diode technology have enabled high efficiency direct diode base modules to emerge as a building block for industrial high power laser systems. Consequently, these systems have been implemented with advance robust, higher-brightness and reliable laser sources for material processing application. Here at the company, we use low-fill factor bars to build fiber-coupled and passively cooled modules, which form the foundation for “TruDiode,” the series of TRUMPF direct diode laser systems that can perform in the multi-kilowatt arena with high beam quality. However, higher reliable output power, additional efficiency and greater slow axis beam quality of the high power laser bars are necessary to further increase the brightness and reduce the cost of the systems. In order to improve the slow axis beam quality, we have optimized the bar epitaxial structures as well as the lateral design. The detailed near field and far field studies of the slow axis for each individual emitters on the bar provide us with information about the dependency of beam quality as a function of the drive current. Based on these study results for direct diode application, we have optimized the high brightness bar designs at 900-1070nm wavelengths. In addition, high power and high efficiency laser bars with high fill factors have been used to build the pump sources for thin disc laser systems at TRUMPF Photonics. For better system performances with lower costs, we have further optimized bar designs for this application. In this paper, we will give an overview of our recent advances in high power and brightness laser bars with enhanced reliability. We will exhibit beam quality study, polarization and reliability test results of our laser bars in the 900-1070nm wavelengths region for coarse wavelength multiplexing. Finally, we will also present the performance and reliability results of the 200W bar, which will be used for our next generation thin disk laser pump source.

Paper Details

Date Published: 26 February 2013
PDF: 10 pages
Proc. SPIE 8605, High-Power Diode Laser Technology and Applications XI, 86050U (26 February 2013); doi: 10.1117/12.2004979
Show Author Affiliations
Haiyan An, TRUMPF Photonics (United States)
Ching-Long (John) Jiang, TRUMPF Photonics (United States)
Yihan Xiong, TRUMPF Photonics (United States)
Aloysius Inyang, TRUMPF Photonics (United States)
Qiang Zhang, TRUMPF Photonics (United States)
Alexander Lewin, TRUMPF Photonics (United States)
Stephan Strohmaier, TRUMPF Photonics (United States)
Georg Treusch, TRUMPF Photonics (United States)

Published in SPIE Proceedings Vol. 8605:
High-Power Diode Laser Technology and Applications XI
Mark S. Zediker, Editor(s)

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