Category: Optics
Defective atomic lattice enables unidirectional reflection lasing
—
in OpticsWhat the study found The study reports a scheme for mode-tunable unidirectional reflection lasing using a coherent gain atomic system and a one-dimensional defective atomic lattice. The authors describe this as a single system that combines nonreciprocity and lasing oscillation. Why the authors say this matters The authors say the approach could improve the efficiency…
Mie void cavities show polaritonic spectra under resonant loading
—
in OpticsWhat the study found The study found that spherical Mie void cavities, including the inverse case of a void inside a resonant dispersive medium, can be analyzed for their resonant characteristics and polaritonic spectra. The authors report approximate analytical expressions for the Q-factors of these cavities and identify parameter ranges associated with weak and strong…
Mie scattering explains the bright central Poisson spot
—
in OpticsWhat the study found The study found that Mie scattering theory, which describes how waves scatter from spherical objects, offers a new explanation for the Poisson spot, also called the Arago or Fresnel spot. It also shows that the diffraction patterns from a sphere and from a circular disk can be understood as complementary outcomes…
PbPc fiber laser produced stable femtosecond pulses and near-infrared supercontinuum
—
in OpticsLead phthalocyanine saturable absorber enables stable femtosecond pulse generation in fiber laser and broadband near-infrared supercontinuum synthesis.
Yb:Ca3TaGa3Si2O14 laser achieved 50 fs mode-locked pulses
—
in OpticsFirst mode-locked laser using Yb:Ca3TaGa3Si2O14 crystal achieves 50 fs pulses with high efficiency, demonstrating potential for ultrafast solid-state laser systems.
Coherently driven B centres in hBN emit indistinguishable photons
—
in OpticsB centre defects in hexagonal boron nitride demonstrate high-visibility two-photon interference and coherent light emission when excited resonantly using a metal-dielectric cavity structure.
Pump power tunes wavelength in a Lyot filter
—
in OpticsInvestigation of pump-induced wavelength tuning mechanism in a Lyot filter using polarization-maintaining ytterbium and erbium-doped fibers, achieving single-frequency operation.
Inner cladding alters predicted TMI threshold in fiber amplifiers
—
in OpticsInvestigate transverse mode instability in high-power Yb-doped fiber amplifiers using a three-layer optical-thermal model with stimulated thermal Rayleigh scattering analysis.
Terahertz pulse behavior in negative-index metamaterials is intensity dependent
—
in OpticsStudy reveals terahertz laser pulses create bright solitons below and dark solitons above a critical frequency in negative index meta-materials, with intensity-dependent bandwidth.
