Mode-locked fiber laser at 2.8 μm using a chemical-vapor-deposited WSe_2 saturable absorber mirror

摘要

We demonstrate a 2.8 mu m mid-infrared Er-doped ZBLAN mode-locked fiber laser by employing transition metal dichalcogenides (TMD) as a saturable absorber mirror (SAM) for the first time. The TMD-SAM with a large modulation depth of 24% was fabricated by transferring a chemical-vapor-deposited high-quality large-area few-layer WSe2 on a gold-coated mirror. Stable mode-locked pulses of 21 ps were obtained with a repetition rate of 42.43 MHz and an average output power up to 360 mW. (c) 2019 The Japan Society of Applied Physics