A short piece of specialty optical fiber acts as the backbone of various fiber-based devices such as high-power laser, amplifier, sensor, etc. suitable for various applications like communication, medical diagnosis, industrial as well as advance basic research. The performance of this specialty optical fiber will depend on the selection of materials, fabrication process technology used, and suitable optimization of various process steps. Accordingly the fabrication of a good quality silica-based specialty fiber doped with suitable dopants in a reliable and repeatable manner is a key challenge from a technological viewpoint and will be briefly discussed.
Transition metal (TM) doping in silica core optical fiber is one of the research area which has been studied for long time
and Chromium (Cr) doping specially attracts a lot of research interest due to their broad emission band covering U, C
and L band with many potential application such as saturable absorber or broadband amplifier etc. This paper present
fabrication of Cr doped nano-phase separated silica fiber within yttria-alumina-silica core glass through conventional
Modified Chemical Vapor Deposition (MCVD) process coupled with solution doping technique along with different
material and optical characterization. For the first time scanning electron microscope (SEM) / energy dispersive X-ray
(EDX) analysis of porous soot sample and final preform has been utilized to investigate incorporation mechanism of Crions
with special emphasis on Cr-species evaporation at different stages of fabrication. We also report that optimized
annealing condition of our fabricated preform exhibited enhanced fluorescence emission and a broad band within 550-
800 nm wavelength region under pumping at 532 nm wavelength due to nano-phase restructuration.
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 while the thulium ions clustering should be avoided to prevent the cooperative upconversion and quenching processes. The fabricated fibers featured pump absorption up to 70dB/m at a pump wavelength of 1611nm. The single-frequency master oscillator with a resonator composed of a pair of fiber Bragg gratings and a thulium-doped fiber was demonstrated with predominantly single ended operation. We achieved a slope efficiency of 22\% and a threshold of 22mW at a lasing wavelength of 1944nm.
Silica-based thulium-doped fiber devices operating around 810 nm would extend the spectral range covered by highpower
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 enhanced 3H4lifetime up to 58 μs as measured in our highly alumina-codoped fibers. We present optimization of the thulium-doped
fiber and laser cavity parameters and also potential applications of the developed host material in amplifiers and
broadband sources.
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