Broad-Area Laser Bars for 1 kW-Emission: Demonstrating increased efficiency and narrowed far field

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Matthias M Karow

Broad-Area Laser Bars for 1 kW-Emission

Demonstrating increased efficiency and narrowed far field

Matthias M Karow

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English

Cuvillier
20 July 2022

Electrician skills; Building construction & materials

Summary
Details

Industrial laser systems for material processing applications rely on the availability of highly efficient, high-brightness diode lasers. GaAs-based broad-area laser bars play a vital role in such applications as pump sources for high-beam-quality solid-state lasers and, increasingly, as direct processing tools. This work studies 940 nm-laser bars emitting 1 kW optical power at room temperature, identifying those physical mechanisms that are currently limiting electrical-to-optical conversion efficiency as well as lateral beam quality. In the process, several diagnostic studies on bars with varied lateral-longitudinal design were carried out. The effects of technological measures for performance optimization were analyzed, yielding a new benchmark in efficiency and lateral divergence. The studies into altered resonator lengths of 4 and 6 mm as well as fill factors between 69 and 87 % successfully reduce both the voltage dropping across the device and power saturation at high currents, enabling 66 % efficiency at the operation point. Concrete measures how to reach efficiencies >=70 % are presented thereafter, showing that doubling the efficiency value of the first 1 kW-demonstration in 2007 - amounting to 35 % - is in near reach. Investigation of the beam quality bases on a herein proposed and realized concept, in which the far field is resolved for each individual bar emitter. In this way, it is possible to determine how far-field profiles vary along the bar width and how much these variations affect the overall bar far-field. Further, such effects specific to bar structures can be separated into non-thermal and thermal influences. The effect of mechanical chip deformation (bar smile) as well as neighboring-emitter interaction has been investigated for the first time in active kW-class devices, yielding a lateral divergence as low as 8.8 Degrees at the operation point.

By: Matthias M Karow
Imprint: Cuvillier
Dimensions: Height: 210mm, Width: 148mm, Spine: 8mm
Weight: 177g
ISBN: 9783736976269
ISBN 10: 3736976267
Pages: 142
Publication Date: 20 July 2022
Audience: General/trade , ELT Advanced
Format: Paperback
Publisher's Status: Active