1018 nm dalga boyunda çalışan iterbiyum katkılı yüksek güçlü fiber lazer araştırılması ve geliştirilmesi

The development of ytterbium-doped fiber lasers (YDFL) operating around 1018 nm with two major pumping schemes are reported. The study on the developed all fiber lasers were characterized based on parameters such as pump source, active fiber type and output-coupling fiber Bragg gratings. Diode lasers operating at around 915 nm, and 976 nm were used as primary pump sources for the experiments. While several works had reported 1018 nm YDFLs using 976 nm pump sources, up until now, there were no reports of the use of 915 nm for 1018 nm YDFLs in the literature. Active fiber types, based on length and doping concentration of ytterbium ions were also considered. The choice of output coupling (OC) fiber Bragg gratings (FBG) were made based on laser model simulation and manufacturing feasibility. Simulations were also carried out for every tested set of implemented parameters so as to minimize undesired optical effects such as amplified stimulated emission (ASE) and inadequate pump absorption. For both pump sources, high power ytterbium-doped all-fiber lasers operating in the 1018 nm region with good efficiency and amplified stimulated emission (ASE) suppression were established. In addition, the broad absorption cross-section of ytterbium-doped glasses around 915 nm was exploited as tunable pump sources for the fiber laser systems demonstrated.