Assessment of high-power kW-class single-diode bars for use in highly efficient pulsed solid state laser systems

Antonio Lucianetti; Jan Pilar; Alina Pranovich; Martin Divoky; Tomas Mocek; K. Ertel; Helena Jelinkova; P. Crump; C. Frevert; R. Staske; Götz Erbert; Günther Traenkle

doi:10.1117/12.2077558

13 March 2015 Assessment of high-power kW-class single-diode bars for use in highly efficient pulsed solid state laser systems

Antonio Lucianetti, Jan Pilar, Alina Pranovich, Martin Divoky, Tomas Mocek, K. Ertel, Helena Jelinkova, P. Crump, C. Frevert, R. Staske, Götz Erbert, Günther Traenkle

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Proceedings Volume 9348, High-Power Diode Laser Technology and Applications XIII; 934811 (2015) https://doi.org/10.1117/12.2077558
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

In this work, we present measurements of efficiency-optimized 940 nm diode laser bars with long resonators that are constructed with robustly passivated output facets at the Ferdinand-Braun-Institut (FBH). The measurements were performed at room temperature on a test bench developed at HiLASE Centre, as a function of operating condition. The single-diode bars generated < 1.0 kW when tested with 1 ms pulses at 1-10Hz operating frequency, corresponding to < 1 J per pulse. The maximum electrical-to-optical efficiency was < 60 %, with operating efficiency at 1 kW of < 50%, limited by the ~ 200 μΩ resistance of the bar packaging. In addition, slow axis divergence at 1 kW was below 6° FWHM and spectral width at 1 kW was below 7 nm FWHM, as needed for pumping Yb-doped solid state amplifier crystals.

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Antonio Lucianetti, Jan Pilar, Alina Pranovich, Martin Divoky, Tomas Mocek, K. Ertel, Helena Jelinkova, P. Crump, C. Frevert, R. Staske, Götz Erbert, and Günther Traenkle "Assessment of high-power kW-class single-diode bars for use in highly efficient pulsed solid state laser systems", Proc. SPIE 9348, High-Power Diode Laser Technology and Applications XIII, 934811 (13 March 2015); https://doi.org/10.1117/12.2077558

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KEYWORDS

Semiconductor lasers

Diodes

Solid state lasers

High power lasers

Laser systems engineering

Diode pumped solid state lasers

Neodymium

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