Figure | Structure and performances of heterostructure-saturable absorber and graphene-saturable absorber. (IMAGE)
Caption
Figure | Structure and performances of heterostructure-saturable absorber and graphene-saturable absorber. a, Schematic representation of the MoS2-BN-graphene-BN-MoS2 heterostructure embedded between optical fibre end facets. The heterostructure forms a nanocavity with a nonuniform optical field distribution. The input laser with random phases is modulated into phase-locked pulses with the interaction of the heterostructure-saturable absorber. b, Polarization-dependent mode-locking measurements in the all-fibre lasers. Output states of the fibre laser with graphene-saturable absorber (left) and heterostructure-saturable absorber (right) are plotted on Poincaré spheres, which are color-coded by the integral intensity of the primary pulse on the oscilloscope. Approximately 20% of the polarization states can maintain single pulse mode-locking for the graphene-saturable absorber, while the value for the heterostructure-saturable absorber is approximately 85%. c, Experimental real-time characterization of the entire buildup and evolution processes of double solitons for the graphene-saturable absorber (left) and of a single soliton for the heterostructure-saturable absorber (right). During the relaxation oscillation stage of heterostructure-saturable absorber, the competing background pulses are significantly suppressed and no pulse splitting is observed throughout the entire test.
Credit
Jiahui Shao et al.
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CC BY