A.A. Umnikov

Optical amplification in 1430-1495 nm range and laser action in Bi-doped fibers.

An emission band with a maximum at 1430 nm and a FWHM of 100 nm was observed in a Bi-doped fiber under core-pumping in the 1340- 1370 nm wavelength range. Net gain in 1430-1490 nm and laser action in 1443-1459 nm wavelength range in the Bi-doped aluminosilicate fiber have been demonstrated for the first time to our knowledge.

Yb3+-doped double-clad fibers and lasers

We present results of the research and development of double-clad Yb3+-doped fibers for high-power fiber lasers. The quality of the fabricated fibers and optimization of reflecting Bragg gratings allowed us to demonstrate fiber lasers with a quantum efficiency close to 90%. These fiber lasers were used in Raman converters emitting at various wavelengths.

Al-free core composition bismuth-doped optical fibre with luminescence band at 1300 nm

Fabrication technique and spectroscopic study of MCVD Bi-Na-doped phosphosilicate glass core optical fibres are discussed. The fibres reveal a broadband luminescence with the maximum in 1300 nm range.