62-dB-gain multiple-pass slab geometry Nd:YAG amplifier

Abstract
We have achieved 62 dB of gain in a four-pass 4 mm × 4 mm × 10 cm flash-lamp-pumped Nd:YAG slab laser amplifier. The zigzag-slab geometry permits the overlap of several beams in a small gain volume and thus provides efficient high-gain unsaturated amplification.