Single longitudinal mode fiber laser with integration of gallium-erbium co-doped fiber (original) (raw)
Single longitudinal mode (SLM) lasers have gained much attention because of its ability to generate narrow linewidth output with low phase noise necessary for applications in optical communication and sensing. The generation of SLM in fiber laser is highly desirable due to its excellent performance and coupling simplicity. The issue however, is the complexity imposed by the inherently long cavity length and doped fiber gain medium, which lead to small free spectral range (FSR) and broad gain bandwidth. The experimental work presented in this thesis demonstrates SLM operation using Ga- EDF as gain medium together with several mode filtration techniques in the laser setup. High Erbium ion concentration in the fiber leads to high gain coefficient allowing short gain medium length to be used hence reducing the cavity length and widening the FSR. Ring cavity configuration employing optimum Ga-EDF length of 2 m was employed as the base structure. In order to suppress and filter the multi ...
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