The phase locking control of the multichannel holographic neodymium laser system with the help of a passive Q-switch

摘要

The phase locking of laser generators requires compensation of the distortions of laser emission and the difference in the lengths of resonators. In [1–3], we suggested to phase the diffraction coupled loop laser resonators [4, 5] that provide the self compensation of the lengths and optical distortions with the phase configuration (PC) on the holographic gain gratings and experimentally produced the phased two channel and three channel holographic YAG : Nd laser systems with long range and shortrange coupling. The laser system with long range coupling (each channel with each one) provides a high interference contrast of emission of laser channels up to 0.9 [2]. However, it has limitations for an increase in the number of laser channels because of their optical coupling in one common active element. On the contrary, in the scheme with short range coupling (coupling of neighboring channels), unlimited scaling of the number of laser channels can be realized since each pair of neighboring channels has its own coupling active element. However, the interference contrast of the two channel YAG : Nd laser system operating by such scheme in a free running mode was no higher than 0.6 [3].