Relativity opens the door to a counterintuitive fact: A state can be stable to perturbations in
one frame of reference and unstable in another one. For this reason, the job of testing the …

That the speed of light in free space is constant is a cornerstone of modern physics.
However, light beams have finite transverse size, which leads to a modification of their wave …

We measured for the first time the influence of the Gouy effect on focused few-cycle laser
pulses. The carrier-envelope phase is shown to undergo a smooth variation over a few …

By use of dynamic subtraction it is feasible to adopt phase-sensitive detection with a CCD
camera to reduce long-term optical background drift. We report on a two-order improvement …

Einstein's theory of relativity establishes the speed of light in vacuum, c, as a fundamental
constant. However, the speed of light pulses can be altered significantly in dispersive …

That the speed of light in vacuum is constant is a cornerstone of modern physics. However,
recent experiments have shown that when the light field is confined in the transverse plane …

Recently, a series of theoretical and experimental papers on free-space propagation of
pulsed Laguerre-Gaussian and Bessel beams was published, which reached contradictory …

Recent measurements have highlighted that even in vacuum spatially shaped photons
travel slower than c, the speed of monochromatic plane waves. Here we investigate the …

We study the group velocity of pulsed light beams in vacuum. Gouy's phase associated with
the diffraction of transversally limited pulses can create a strong anomalous dispersion in …

" Thin-film microoptics" stands for novel types of microoptical components and systems
which combine the well-known features of miniaturized optical elements with the specific …