The resolution of conventional optical elements and systems has long been perceived to
satisfy the classic Rayleigh criterion. Paramount efforts have been made to develop different …

Super-resolution optical microscopy, which gives access to finer details of objects, is highly
desired for fields of nanomaterial, nanobiology, nanophotonics, etc. Many efforts, including …

Light with helical phase wavefront carries orbital angular momentum, a unique feature
widening the horizon of optical imaging applicability. Here, we take particular interest in the …

The resolution of conventional optical equipment is always restricted by the diffraction limit,
and improving on this was previously considered improbable. Optical super-resolution …

Fluorescence microscopy has long been a valuable tool for biological and medical imaging.
Control of optical parameters such as the amplitude, phase, polarization, and propagation …

Although fiber-optical two-photon endoscopy has been recognized as a potential high-
resolution diagnostic and therapeutic procedure in vivo, its resolution is limited by the optical …

We compare different beam combinations for stimulated emission depletion microscopy. The
four considered copolarized, mutually symmetric, but complementary write erase beam …

We experimentally demonstrate a random distributed feedback fiber laser generating
cylindrical vector beams via a mode-selective coupler and a fiber ring resonator with 50-m …

Stimulated emission depletion (STED) fluorescence microscopy squeezes an excited spot
well below the wavelength scale using a doughnut-shaped depletion beam. To generate a …

We report on the experimental demonstration of improved lateral resolution in stimulated
emission depletion (STED) microscopy using an annular depletion beam configuration. A …