Abstract

The feasibility of direct laser diode pumping of Bi-doped fiber lasers at the wavelengths of 915 and $975\mathrm{nm}$ was examined by measuring excited state absorption in Bi-doped silicate fibers for the wavelength range of $900–1250\mathrm{nm}$. When the Bi-doped fibers were pumped at $1047\mathrm{nm}$ a strong excited state absorption was found at 915 and $975\mathrm{nm}$, whereas no significant excited state absorption was observed in the $1080\mathrm{nm}$ pumping band nor in the emission band, $\sim 1160\mathrm{nm}$, of Bi-doped fiber lasers.

© 2009 Optical Society of America

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