Advanced multichannel laser systems with phase conjugation and interchannel phase locking by laser-gain-hologram long- and short-range coupling

Compact schemes of the phase-locked multichannel Nd:YAG laser system with the long- and shortrange coupling via the holographic gain gratings in the active elements are developed. The phase locking of various loop Nd:YAG lasers with an interference contrast of the laser channels of 0.50–0.87 and a single-mode lasing efficiency of up to 0.64% is experimentally demonstrated. The experimental results for the two- and three-channel laser systems are generalized on multichannel laser systems using the numerical simulation. It is demonstrated that the maximum number of the short-range-coupled laser channels can be increased owing to the leveling of the parameters of laser channels to a value that is greater than that the maximum number of the channels in the presence of the long-range coupling, which is limited by the damage threshold of the active element of the interchannel coupling.