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Proceedings Paper

Design progress for higher efficiency and brightness in 1 kW diode-laser bars
Author(s): M. M. Karow; D. Martin; P. Della Casa; G. Erbert; P. Crump
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Paper Abstract

We present 1 kW-emitting diode-laser bars optimized for higher conversion efficiency and smaller far-field angle Θ95% power content), as needed, e.g., for solid-state laser pumping (wavelength λ= 940 nm). First, we review the latest high-efficiency designs, targeting reduced series resistance Rs and less power saturation and then discuss developments for high brightness via tailored chip-internal heat distribution. Recent results include conversion efficiency η of 66% and far-field width Θ 95%= 8.8° at 1 kW (thermal resistance Rth ~ 0.02 K/W), as well as 64% efficiency and 10.8° divergence at Rth ~ 0.05 K/W, equivalent to CW operation with advanced packaging.

Paper Details

Date Published: 2 March 2020
PDF: 7 pages
Proc. SPIE 11262, High-Power Diode Laser Technology XVIII, 1126205 (2 March 2020); doi: 10.1117/12.2545918
Show Author Affiliations
M. M. Karow, Ferdinand-Braun-Institut (Germany)
D. Martin, Ferdinand-Braun-Institut (Germany)
P. Della Casa, Ferdinand-Braun-Institut (Germany)
G. Erbert, Ferdinand-Braun-Institut (Germany)
P. Crump, Ferdinand-Braun-Institut (Germany)

Published in SPIE Proceedings Vol. 11262:
High-Power Diode Laser Technology XVIII
Mark S. Zediker, Editor(s)

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