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Abstract
Ultrafast fiber lasers with broad bandwidth and short pulse duration have a variety of applications, such as ultrafast time-resolved spectroscopy and supercontinuum generation. We report a simple and compact all-fiber thulium-doped femtosecond laser mode-locked by carbon nanotubes. The oscillator operates in slightly normal cavity dispersion at 0.055 ps2, and delivers 152 fs pulses with 52.8 nm bandwidth and 0.19 nJ pulse energy. This is the shortest pulse duration and the widest spectral width demonstrated from Tm-doped all-fiber lasers based on 1 or 2 dimensional nanomaterials, underscoring their growing potential as versatile saturable absorber materials.
Highlights
NPE3 and SESAMs7 are the two most widely studied mechanisms for mode-locking Tm-doped fiber lasers, they still suffer from some fundamental drawbacks
A new generation of saturable absorber (SA) based on 1D or 2D nanomaterials have come into prominence[23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38]
A section of germanium-silicate (GeO2/SiO2) fiber was used to control the intracavity dispersion, 450 fs pulses with 15.8 nm bandwidth were directly achieved in a CNTs/NALM hybrid mode-locked Tm-doped fiber laser[19]
Summary
NPE3 and SESAMs7 are the two most widely studied mechanisms for mode-locking Tm-doped fiber lasers, they still suffer from some fundamental drawbacks. Fiber lasers mode-locked by CNTs have been widely demonstrated in the 1 41–43, 1.5 23,44–46 and 2 μm[25,30,47,48,49] region. Because of the large negative dispersion of SMF fiber at 2 μm, CNT-mode-locked Tm-doped fiber oscillators typically emit picosecond pulses[25,29,47].
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