KASIK , Ivan

We investigate performance of compact thu- lium-doped fiber laser at 810 nm in three diffe- rent hosts: ZBLAN, standard silica and silica modified by high alumina codoping. We found that efficient lasing at 810 nm in silica should be possible for short ranges of fiber parameters, especially when 3H lifetime is enhanced.

Silica-based thulium-doped fiber devices operating around 810 nm would extend the spectral range covered by high- power fiber devices. Using a comprehensive numerical model of the fiber we have shown that efficient lasing at 810 nm can be achieved for specific ranges of the laser cavity parameters in silica-based thulium-doped fibers with...

Thulium-doped fibers suitable for core-pumped single-frequency lasers were fabricated by the modified chemical vapor deposition (MCVD) method. Refractive index profile, doping profile and spectral absorption was measured. High doping concentration of thulium ions should be achieved to allow for high absorption of light at a pump wavelength...