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Proceedings Paper

Novel high-brightness fiber coupled diode laser device
Author(s): Matthias Haag; Bernd Köhler; Jens Biesenbach; Thomas Brand
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Paper Abstract

High brightness becomes more and more important in diode laser applications for fiber laser pumping and materials processing. For OEM customers fiber coupled devices have great advantages over direct beam modules: the fiber exit is a standardized interface, beam guiding is easy with nearly unlimited flexibility. In addition to the transport function the fiber serves as homogenizer: the beam profile of the laser radiation emitted from a fiber is symmetrical with highly repeatable beam quality and pointing stability. However, efficient fiber coupling requires an adaption of the slow-axis beam quality to the fiber requirements. Diode laser systems based on standard 10mm bars usually employ beam transformation systems to rearrange the highly asymmetrical beam of the laser bar or laser stack. These beam transformation systems (prism arrays, lens arrays, fiber bundles etc.) are expensive and become inefficient with increasing complexity. This is especially true for high power devices with small fiber diameters. On the other hand, systems based on single emitters are claimed to have good potential in cost reduction. Brightness of the inevitable fiber bundles, though, is limited due to inherent fill-factor losses. At DILAS a novel diode laser device has been developed combining the advantages of diode bars and single emitters: high brightness at high reliability with single emitter cost structure. Heart of the device is a specially tailored laser bar (T-Bar), which epitaxial and lateral structure was designed such that only standard fast- and slow-axis collimator lenses are required to couple the beam into a 200&mgr;m fiber. Up to 30 of these T-Bars of one wavelength can be combined to reach a total of > 500W ex fiber in the first step. Going to a power level of today's single emitter diodes even 1kW ex 200&mgr;m fiber can be expected.

Paper Details

Date Published: 7 February 2007
PDF: 8 pages
Proc. SPIE 6456, High-Power Diode Laser Technology and Applications V, 64560T (7 February 2007); doi: 10.1117/12.700941
Show Author Affiliations
Matthias Haag, Dilas Diodenlaser GmbH (Germany)
Bernd Köhler, Dilas Diodenlaser GmbH (Germany)
Jens Biesenbach, Dilas Diodenlaser GmbH (Germany)
Thomas Brand, Dilas Diodenlaser GmbH (Germany)


Published in SPIE Proceedings Vol. 6456:
High-Power Diode Laser Technology and Applications V
Mark S. Zediker, Editor(s)

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