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We have improved on the characteristics of a diode-pumped, 1064-nm amplifier. The system can deliver 400 mJ @ 100 Hz with very limited wavefront distortion due to thermal effects. It follows that the amplifier can be powered on and reach full energy in a few seconds. The amplifier stable long thermal lens ensures that optical elements used downpath (potentially non-linear crystals for frequency conversion, or a telescope) are at no risk of laser damage, even during the short warm-up time. Additionally, the amplifying system can be operated at any repetition rate up to 100 Hz, and at any energy level, without having to adjust the hardware. The ease of operation, and number of shots saved on the diode lifetime can be a critical advantage in space. The amplifier pumping design enables duplication of the pump source with only 3% increase of the system mass: the doubling of the stacks does not require any additional optical component, nor any moving part. With solar radiation, the diode stacks are among the weakest link of the system, so this unique property is valuable for space applications. The laser amplifier was set-up and characterized as a laboratory breadboard, and a CAD version of a robust system was drawn and analyzed. We will review the properties of this compact amplifying system. Due to its uniform output beam distribution, it is very well suited for non-linear frequency conversion, and for long-range space applications. Additional presentation content can be accessed on the supplemental content page.
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