Mamyshev oscillators (MOs) have attracted significant attention given their potential in
yielding ultrafast lasers with high peak power. Based on step‐like saturable absorbers and …

Gain medium‐doped active optical fibers for optical amplification and long‐range
transmission have triggered a lot of researches. Traditional rare‐earth ion‐doped active …

We study the time reflection and time refraction of waves caused by a spatial interface with a
medium undergoing a sudden temporal change in permittivity. We show that monochromatic …

We propose superluminal solitons residing in the momentum gap (k gap) of nonlinear
photonic time crystals. These gap solitons are structured as plane waves in space while …

Though much of the interest in fluorescence in the past has been on measuring spectral
qualities such as wavelength and intensity, there are two other highly useful intrinsic …

Recently, Floquet systems have attracted a great deal of interest as they offer the
unprecedented ability to engineer topological states through the tuning of an external time …

We report ultrafast optical measurements of the Dirac line-node semimetal ZrSiS and the
Weyl semimetal NbAs, using mid-infrared pump photons from 86 meV to 500 meV to directly …

Nonlinear optical effect of spontaneous parametric down-conversion (SPDC) is widely used
to produce entangled photon pairs for quantum information research and applications. We …

We propose and demonstrate numerically a measurement scheme for complete
reconstruction of the 2D quantum wave function of a Bose-Einstein condensate, amplitude …

Materiais ópticos com propriedades variando ao longo do tempo são introduzidos no artigo,
com foco especial nos cristais fotônicos temporais. Inicialmente, são exploradas as …