Abstract

Luminescence emission and excitation spectra of bismuth-doped silica optical fibers free of other dopants have been obtained to construct an emission-excitation map in a wide wavelength range of 4001600nm. The main low-lying energy levels of the bismuth active centers in such fibers have been determined. For the first time (to our knowledge), optical gain and lasing have been obtained in such fibers. A gain of 8dB has been achieved with a pump power of 340mW, and a cw fiber laser emitting at 1460nm with an output power of 40mW and an efficiency of 3% has been created.

© 2011 Optical Society of America

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