14,210 research outputs found
Large energy soliton erbium-doped fiber laser with a graphene-polymer composite mode locker
Due to its unique electronic property and the Pauli Blocking Principle,
atomic layer graphene possesses wavelength-independent ultrafast saturable
absorption, which can be exploited for the ultrafast photonics application.
Through chemical functionalization, a graphene-polymer nanocomposite membrane
was fabricated and firstly used to mode lock a fiber laser. Stable mode locked
solitons with 3 nJ pulse energy, 700 fs pulse width at the 1590 nm wavelength
have been directly generated from the laser. We show that graphene-polymer
nanocomposites could be an attractive saturable absorber for high power fiber
laser mode locking.Comment: Large energy soliton erbium-doped fiber laser with a graphene-polymer
composite mode locker. Applied Physics Letters, Accepte
Effects of Rashba spin-orbit coupling and a magnetic field on a polygonal quantum ring
Using standard quantum network method, we analytically investigate the effect
of Rashba spin-orbit coupling (RSOC) and a magnetic field on the spin transport
properties of a polygonal quantum ring. Using Landauer-Buttiker formula, we
have found that the polarization direction and phase of transmitted electrons
can be controlled by both the magnetic field and RSOC. A device to generate a
spin-polarized conductance in a polygon with an arbitrary number of sides is
discussed. This device would permit precise control of spin and selectively
provide spin filtering for either spin up or spin down simply by interchanging
the source and drain
Graphene mode locked, wavelength-tunable, dissipative soliton fiber laser
Atomic layer graphene possesses wavelength-insensitive ultrafast saturable
absorption, which can be exploited as a full-band mode locker. Taking advantage
of the wide band saturable absorption of the graphene, we demonstrate
experimentally that wide range (1570 nm - 1600nm) continuous wavelength tunable
dissipative solitons could be formed in an erbium doped fiber laser mode locked
with few layer graphene
Dual-wavelength domain wall solitons in a fiber ring laser
We report on the experimental observation of a new type of dark soliton in a
fiber laser made of all normal group velocity dispersion fibers. It was shown
that the soliton is formed due to the cross coupling between two different
wavelength laser beams and has the characteristic of separating the two
different wavelength laser emissions. Moreover, we show experimentally that the
dual-wavelength dark solitons have a much lower pump threshold than that of the
nonlinear Schr\"odinger equation dark solitons formed in the same laser.Comment: 19 page
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