High-power system based on a pulse-periodic YAG:Nd3+ laser with an unstable telescopic resonator and a two-stage amplifier

A description is given of a high-power YAG:Nd³⁺ laser system including a master oscillator with an unstable telescopic resonator, polarization coupling-out of radiation, and a two-stage amplifier. The energy, time, spectral, and spatial characteristics of the master oscillator and of the system as a whole were investigated. The system was capable of generating radiation pulses of 10 Hz repetition frequency with a divergence close to the diffraction limit and an output power in excess of 70 MW.