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Design of a diode-pumped multipass amplifier for the LMJ front end

We present the design of a diode-pumped Neodymium glass amplifier delivering one Joule output pulses with a 1 Hz to 10 Hz repetition rate, good stability due to diode pumping and good beam properties due to the uniformity of energy deposition. The amplifier architecture is simple and rugged. We show that, when an amplifier with an amplification section of about 1 cm3 is considered, 5 J useful stored energy yields an output pulse with a more than 1 J energy and with low spatial and temporal distortions.