Passively continuous-wave mode-locked Er~(3+)-doped ZBLAN fiber laser at 2.8 μm

摘要

An Er~(3+)-doped ZrF_4-BaF_2-LaF_3-AlF_3-NaF (ZBLAN) fiber laser was passively mode-locked by inserting a Fe~(2+):ZnSe crystal into the free space part of the cavity. Continuous-wave mode-locked pulses at 2.8 μm with a pulse duration of 19 ps estimated from the spectral bandwidth and an average power of 51 mW were generated when a collimated beam traversed the Fe~(2+):ZnSe crystal, while Q-switched mode-locked pulses were obtained when the Fe~(2+):ZnSe crystal was illuminated by the focused beam.