13,822 research outputs found
Non-equilibrium dynamics in the dual-wavelength operation of Vertical external-cavity surface-emitting lasers
Microscopic many-body theory coupled to Maxwell's equation is used to
investigate dual-wavelength operation in vertical external-cavity
surface-emitting lasers. The intrinsically dynamic nature of coexisting
emission wavelengths in semiconductor lasers is associated with characteristic
non-equilibrium carrier dynamics which causes significant deformations of the
quasi-equilibrium gain and carrier inversion. Extended numerical simulations
are employed to efficiently investigate the parameter space to identify the
regime for two-wavelength operation. Using a frequency selective intracavity
etalon, two families of modes are stabilized with dynamical interchange of the
strongest emission peaks. For this operation mode, anti-correlated intensity
noise is observed in agreement with the experiment. A method using effective
frequency selective filtering is suggested for stabilization genuine
dual-wavelength output.Comment: 15 pages, 7 figure
Physics and Applications of Laser Diode Chaos
An overview of chaos in laser diodes is provided which surveys experimental
achievements in the area and explains the theory behind the phenomenon. The
fundamental physics underpinning this behaviour and also the opportunities for
harnessing laser diode chaos for potential applications are discussed. The
availability and ease of operation of laser diodes, in a wide range of
configurations, make them a convenient test-bed for exploring basic aspects of
nonlinear and chaotic dynamics. It also makes them attractive for practical
tasks, such as chaos-based secure communications and random number generation.
Avenues for future research and development of chaotic laser diodes are also
identified.Comment: Published in Nature Photonic
Stimulated plasmon polariton scattering
The plasmon and phonon polaritons of two-dimensional (2d) and van-der-Waals
materials have recently gained substantial interest. Unfortunately, they are
notoriously hard to observe in linear response because of their strong
confinement, low frequency and longitudinal mode symmetry. Here, we propose a
fundamentally new approach of harnessing nonlinear resonant scattering that we
call stimulated plasmon polariton scattering (SPPS) in analogy to the
opto-acoustic stimulated Brillouin scattering (SBS). We show that SPS allows to
excite, amplify and detect 2d plasmon and phonon polaritons all across the
THz-range while requiring only optical components in the near-IR or visible
range. We present a coupled-mode theory framework for SPS and based on this
find that SPS power gains exceed the very top gains observed in on-chip SBS by
at least an order of magnitude. This opens exciting new possibilities to
fundamental studies of 2d materials and will help closing the THz gap in
spectrocopy and information technology.Comment: 7 pages, 3 figure
Optical devices - Lasers. A compilation
Laser applications in communications, industrial fabrication, and computer systems, and laser beam generation and control - technology utilizatio
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