Scaleable multi format QCW pump stacks based on 200W laser diode bars and mini bars at 808nm and 940nm
Advanced solid state laser architectures place increasingly demanding requirements on high brightness, low cost QCW laser diode pump sources, with custom apertures both for side and end rod pumping configurations. To meet this need, a new series of scaleable pump sources at 808nm and 940nm was developed. The stacks, available in multiple output formats, allow for custom aperture filling by varying both the length and quantity of stacked laser bars. For these products, we developed next generation laser bars based on improved epitaxial wafer designs delivering power densities of 20W/mm of emission aperture. With >200W of peak QCW power available from a full length 1cm bar, we have demonstrated power scaling to over 2kW in 10 bar stacks with 55% wall plug efficiency. We also present the design and performance of several stack configurations using full length and reduced length (mini) bars that demonstrate the versatility of both the bar and packaging designs. We illustrate how the ROBUST HEAD packaging technology developed at SCD is capable of accommodating variable bar length, pitch and quantity for custom rod pumping geometries. The excellent all around performance of the stacks is supported by reliability data in line with the previously reported 20 Gshot space grade qualification of SCD's stacks.
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