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


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