Abstract
The fabrication process of Thulium-Ytterbium doped optical fiber comprising different host glass through the Modified Chemical Vapor Deposition (MCVD) coupled with solution doping technique is presented. The material and optical performance of different fibers are compared with special emphasis on their lasing efficiency for 2 µm application.
Highlights
Ytterbium doped high-power fiber laser has reached the power level in kW range and research is aiming to enhance the power level further beside increasing long-term stability by optimizing fiber fabrication process with sophisticated instrumentation
The dopant distribution profiles obtained from electron probe microanalysis (EPMA) for Tm-Yb doped optical fiber (TY)-1, TY-2 and TY-3 are presented in Fig. 2a, Fig. 2b and Fig. 2c which exhibit uniform dopant distribution along the preform core
Comparison of scanning electron microscopic images for the core-clad interface for the above three fiber samples revealed that alumino-silicate based fibers (TY-1) exhibit perfect core-clad interface while star-like growth is visible in the case of germanoalumino-silicate fibers (TY-2) as shown in Fig. 2d and Fig. 2e
Summary
Ytterbium doped high-power fiber laser has reached the power level in kW range and research is aiming to enhance the power level further beside increasing long-term stability by optimizing fiber fabrication process (fiber design and host material) with sophisticated instrumentation. Tm ion in silica glass matrix exhibits several energy levels and among several possible transitions 3F4 to 3H6 transition is the most important for near infra-red (NIR) application which can be achieved through excitation at around 0.8 μm, 1.2 μm and 1.6 μm. Doping of Thulium-Ytterbium in an appropriate glass host enables to explore the possibility of pumping over the wavelength region from 0.91 to 0.98 μm for emission in the range of 2 μm. Proper selection of host glass composition, optimum dopant concentration, and appropriate Yb/Tm ratio are of paramount importance to achieve good lasing performance at NIR zone. The lasing performance of fiber samples and lifetimes are compared, and possible reason of the observed result is presented
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