Design progress for higher efficiency and brightness in 1 kW diode-laser bars

M. M. Karow; D. Martin; P. Della Casa; G. Erbert; P. Crump

doi:10.1117/12.2545918

2 March 2020 Design progress for higher efficiency and brightness in 1 kW diode-laser bars

M. M. Karow, D. Martin, P. Della Casa, G. Erbert, P. Crump

Proceedings Volume 11262, High-Power Diode Laser Technology XVIII; 1126205 (2020) https://doi.org/10.1117/12.2545918
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

We present 1 kW-emitting diode-laser bars optimized for higher conversion efficiency and smaller far-field angle Θ_95% 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 R_s 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 R_th ~ 0.02 K/W), as well as 64% efficiency and 10.8° divergence at R_th ~ 0.05 K/W, equivalent to CW operation with advanced packaging.

Citation Download Citation

M. M. Karow, D. Martin, P. Della Casa, G. Erbert, and P. Crump "Design progress for higher efficiency and brightness in 1 kW diode-laser bars", Proc. SPIE 11262, High-Power Diode Laser Technology XVIII, 1126205 (2 March 2020); https://doi.org/10.1117/12.2545918

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