SPECTRAL PROPERTIES OF DYNAMIC POPULATION GRATINGS IN YTTERBIUM DOPED FIBERS
R.V. Drobyshev, I.A. Lobach, S.I. Kablukov
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Dynamic gratings, Ytterbium, self-sweeping
Abstract
In this work, spectral and phase properties of dynamic population gratings in various samples of ytterbium fibers are studied at various powers of recording and pumping radiation. It turned out that, despite differences between the samples, power dependences have a similar character, which is determined by the gain in the fiber and the saturation power in it. It is shown that the phase of the dynamic grating takes on a constant value, changing it only at the instant of the transition from the absorption grating to the gain grating. Significant influence of the phase component in dynamic population gratings in ytterbium doped fibers is experimentally shown.
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