392 research outputs found
Acoustic guiding and subwavelength imaging with sharp bending by sonic crystal
A sharp bending scheme for the self-collimation of acoustic waves is proposed
by simply truncating the sonic crystals. An all-angle and wide-band
90{\deg}-bending wave guide is demonstrated with nearly perfect transmissions
for Gaussian beams at a wide range of incident angles. A 90{\deg}-bended
imaging for a point source with a subwavelength resolution of 0 0.37{\lambda}
is also realized by the proposed structure. These results will find
applicability in the manipulation of acoustic waves by sonic crystals.Comment: 8 pages, 5 figure
Striking nonlinear dynamics of mode-locked fibre lasers
We report on the real-time observation of various remarkable nonlinear phenomena in mode-locked fibre lasers. These include the build-up of dissipative solitons and soliton molecules, collision-induced soliton explosions, and the excitation and dynamics of breathing dissipative solitons and breather molecular complexes. Numerical simulations of the laser model support our experimental findings
Excitation of breather solitons in a mode-locked fibre laser
We report on the generation and study of breathing dissipative solitons in a mode-locked fibre laser. Breathers exist in the laser cavity under the pump threshold of stationary mode locking. For the first time to our knowledge, breathing soliton molecules are also observed. Numerical simulations of the laser model support our experimental findings
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