Development of kJ channel for Nd-glass laser systems with 70 ns' pulse SBS compressor

An optical scheme for a kJ channel of a neodymium glass laser system with SBS-compressor for a 70' ns pulse has been described. The use of a pump pulse of long duration - 70 ns - makes it possible to operate a near-steadySBS mode in compressed gasses. An experimental study of the SBS oscillator-compressor stage with pump focusing and a two-pass pattern has been carried out and a 70 ns', 8 J' pump pulse has been compressed down to 1 ns.