Cladding-pumped ytterbium-doped fiber lasers belong presently among the most attractive high-power laser sources for wavelengths around 1060 nm. While the most typical configuration of the fiber laser cavity is linear Fabry-Perot arrangement with fiber Bragg gratings (FBGs), for some applications the ring cavity is preferable as it offers higher stability when unidirectional operation is enforced with fiber optic isolator . Indeed, Yb doped fiber lasers are prone to the so-called sustained self pulsing that in the case of highly Yb-doped fiber (YDF) may lead to relatively stable self-Q-switched operation . Occurrence of this phenomenon complicates investigation of laser configurations that use other Q-switching mechanism possibly allowing for more stable operation, other repetition rate and peak power, et
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