| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系研究所 === 105 === Because of the eye-safe properties and strong water absorption, 2 m mode-locked fiber laser sources are of big interest in applications of medicine, environmental sensing and materials processing. In this paper,we report on the investigation of mode-locked fiber lasers utilizing a Tm3+-doped nano-engineered yttrium–alumina(YA) silica glass fiber and semiconductor saturable absorber mirrors(SESAMs). The gain fiber, produced by Dr. M. C. Paul’s group in India, presents several benefits, especially the high efficiency and low loss. The pump source is a 1567-nm lab-made double-cladding-pumped Er3+ doped fiber laser. We study the mode-locked laser operation, laser slope efficiency, and output spectra under different reflectivities. Two types of cavity reflector are used. One in the fiber Bragg grating and the other is the fiber loop mirror. We successfully demonstrate the potential of the novel Tm3+-doped yttrium–alumina–silica fiber to produce a self-starting passively mode-locked fiber laser.
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