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This paper summarizes our recent progress in 2 micron fiber lasers using Tm and Tm-Ho-co-doped multi-component glass fibers. Single frequency fiber lasers with linewidth less than 3kHz, Q-switched single frequency fiber lasers with kilowatt peak power, and mode-locked fiber lasers near 2 micron wavelength were demonstrated using these newly developed fibers.
A cladding-pumped dual core ytterbium fiber laser is designed and fabricated to measure phase error tolerance in passive coherent beam combining. We show quantitative measurements on the effects of longitudinal modes on phase error tolerance.
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