A A Umnikov

Bismuth-doped-glass optical fibers—a new active medium for lasers and amplifiers

Optical fibers with bismuth-doped silicate and germanate glass cores were fabricated by the modified chemical vapor deposition technique (solution and vapor-phase Bi incorporation). The fibers revealed an efficient luminescence with a maximum in the 1050-1200 nm spectral range, FWHM up to 200 nm, and a lifetime of the order of 1 ms.

Absorption, Gain, and Laser Action in Bismuth-Doped Aluminosilicate Optical Fibers

In this study, bismuth-doped fiber lasers operating at the wavelength of 1179 nm with an optical efficiency of up to 28% are realized. The fiber gain upon 1-¿m pumping declines, while the unsaturable absorption increases with increasing the small-signal absorption. We conclude that up-conversion and excited-state absorption are responsible for limiting the efficiency of such lasers.

Efficient Yb fiber laser at 980 nm pumped by the high-brightness semiconductor source

Summary form only given. The present work deals with the fabrication of a special active fibers and Yb-doped fiber laser pumped by Superfocus to get an efficient high power oscillation in the vicinity of 980 nm. To build the fiber laser we have used the fiber with an all-silica inner cladding with NA of 0.22 and 25 /spl mu/m diameter and a core with a 6 /spl mu/m diameter. The laser cavity was formed by two gratings with reflection of 99% and 70% for input and output coupler respectively. To minimize the intracavity losses, Bragg gratings were written in the H/sub 2/-loaded active fiber without any splices inside the laser cavity.

Bi-doped silica fibers - a new active medium for tunable fiber lasers and broadband fiber amplifiers

Spectroscopic study of MCVD Bi-doped silica-based optical fibers revealed a broadband long-lived luminescence with the maximum in 1050-1200 nm range that makes such fibers promising for fiber lasers and amplifiers for the second telecommunication window

Photosensitive Yb-doped double-clad fiber for fiber lasers

Photosensitive at 244 nm double-clad Yb-doped germanosilicate fibers have been developed. Fiber lasers based on these fibers exhibited 65% differential efficiency and 100 mW threshold at both 910 and 980 pump wavelengths.

Bi-doped silica fiber laser

A new type of fiber laser - Bi-doped silica fiber laser has been proposed and realized for the first time. The laser generation was observed in the spectral region of 1150-1300 nm. The fibers were fabricated by MCVD technique.

Bismuth-doped optical fibres - spectroscopic study and interpretation of spectra

Absorption and luminescence spectra of MCVD Bi-doped aluminosilicate core optical fibres were studied at 300 and 77 K. It was theoretically shown that spectroscopic features can be assigned to Bi5+ and Bi1+ ions.

High photosensitivity of Al2O3-doped fibers to 193 nm and 157 nm excimer laser irradiation

Significant photosensitivity of aluminosilicate fibers (with and without Er codoping) was observed. Effect of photosensitization was demonstrated for the first time for such fibers. Potential to write gratings directly in Er-doped aluminosilicate fibers was demonstrated.

Absorption and luminescence properties of Cr{sup 4+}-doped silica fibres

The absorption and luminescence spectra of silica fibres doped with chromium and various dopants are studied. Fibres doped with aluminium and gallium exhibit a broad (300 nm) luminescence band of Cr{sup 4+} ions at 1100 nm at room temperature. The quantum yield of luminescence is estimated to be 10{sup -4}-10{sup -5}. (optical fibres)