Progress in reliable single emitters and laser bars for efficient CW-operation in the near-infrared emission range

Martin Zorn; Ralf Huelsewede; Agnieszka Pietrzak; Jens Meusel; Jürgen Sebastian

doi:10.1117/12.2079001

13 March 2015 Progress in reliable single emitters and laser bars for efficient CW-operation in the near-infrared emission range

Martin Zorn, Ralf Huelsewede, Agnieszka Pietrzak, Jens Meusel, Jürgen Sebastian

Author Affiliations +

Proceedings Volume 9348, High-Power Diode Laser Technology and Applications XIII; 93480K (2015) https://doi.org/10.1117/12.2079001
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

Laser bars, laser arrays, and single emitters are highly-desired light sources e.g. for direct material processing, pump sources for solid state and fiber lasers or medical applications. These sources require high output powers with optimal efficiency together with good reliability resulting in a long lifetime of the device. Desired wavelengths range from 760 nm in esthetic skin treatment over 915 nm, 940 nm and 976 nm to 1030 nm for direct material processing and pumping applications. In this publication we present our latest developments for the different application-defined wavelengths in continuouswave operation mode. At 760nm laser bars with 30 % filling factor and 1.5 mm resonator length show optical output powers around 90-100 W using an optimized design. For longer wavelengths between 915 nm and 1030 nm laser bars with 4 mm resonator length and 50 % filling factor show reliable output powers above 200 W. The efficiency reached lies above 60% and the slow axis divergence (95% power content) is below 7°. Further developments of bars tailored for 940 nm emission wavelength reach output powers of 350 W. Reliable single emitters for effective fiber coupling having emitter widths of 90 μm and 195 μm are presented. They emit optical powers of 12 W and 24 W, respectively, at emission wavelengths of 915 nm, 940 nm and 976 nm. Moreover, reliability tests of 90 μm-single emitters at a power level of 12W currently show a life time over 3500 h.

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Martin Zorn, Ralf Huelsewede, Agnieszka Pietrzak, Jens Meusel, and Jürgen Sebastian "Progress in reliable single emitters and laser bars for efficient CW-operation in the near-infrared emission range", Proc. SPIE 9348, High-Power Diode Laser Technology and Applications XIII, 93480K (13 March 2015); https://doi.org/10.1117/12.2079001

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KEYWORDS

Resonators

Laser applications

Laser resonators

Semiconductor lasers

Laser processing

Fiber lasers

Fiber couplers

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