Abstract
Herein, we report on the possibility of ultrashort laser pulse generation in the broadband spectral range using a saturable absorber based on free-standing metallic carbon nanotube thin film. Erbium, thulium, and holmium-doped all-fiber lasers were mode-locked with a single saturable absorber containing a 300 nm thick material layer. Subpicosecond pulses were generated at 1559, 1938, and 2082 nm. Our work validates the broadband operation of metallic carbon nanotube-based saturable absorbers and highlights the suitable performance of nanomatematerial for ultrafast photonic applications.
Highlights
Carbon nanotubes, the one-dimensional form of graphite, maintain substantial popularity among the scientific community
Thulium, and holmium-doped fiber lasers were mode-locked with a single saturable absorber with a 300 nm thick mSWCNT layer, yielding sub-800 fs pulse generation in three wavelength regions: 1.5, 1.9, and 2.1 μm, respectively
Acetone was replaced by the 50% solution of isopropyl alcohol in water and each metallic carbon nanotube film was transferred to a fiber connector or a flat substrate and dried under a nitrogen stream
Summary
The one-dimensional form of graphite, maintain substantial popularity among the scientific community. A large number of diverse ultrafast laser setups based on carbon nanotube saturable absorbers present the material as a nearly universal mode locker To date, they have been applied to fiber lasers operating in a broad range of wavelengths: From visible [25], through the entire near-infrared [26,27,28], to ∼3 μm generated from ZBLAN fiber lasers [29,30]. We extend our previous findings by demonstrating that the saturable absorption outside the M11 transition is broadband and supports ultrashort laser pulse generation in a >500 nm wide spectral range For this purpose, a fully fiberized saturable absorber based on m-SWCNT thin film was fabricated. Thulium, and holmium-doped fiber lasers were mode-locked with a single saturable absorber with a 300 nm thick mSWCNT layer, yielding sub-800 fs pulse generation in three wavelength regions: 1.5, 1.9, and 2.1 μm, respectively
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