Abstract
We propose a method for high-power Gaussian beam amplification of an active-ion-doped inversestep- index fiber. Our method is to induce a strong thermal parabolic index distribution on a fiber core cross section. We show that a single Gaussian beam can be guided by the thermally induced parabolic index formed on an inverse-step-index fiber cross section while maintaining a very low propagation loss coefficient. To prove this numerically, we use the parameters of a laser glass with a high thermo-optic coefficient. Thus, we numerically demonstrate kilowatt-level Gaussian beam amplification of an inverse-step-index fiber amplifier by thermally inducing a high refractive index with a parabolic shape.
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