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Simultaneous spin and orbital angular momentum conservation enables control over the divergence and polarization of EUV vortex beams, paving the way to ultrafast studies of chiral systems using high-harmonic beams with designer spin and orbital angular momentum.
Five wire lasers are phase-locked by a strong coupling and form a coupled cavity. The lasing frequency is around 3.8 THz and is continuously tunable by 10 GHz. A continuous-wave output power of 50–90 mW and beam divergence of ∼10° are achieved.
Rather than requiring millions of pixels, it is possible to make a camera that only needs one pixel. This Review details the working principle, advantages, technical considerations and future potential of single-pixel imaging.
The absolute phase difference of the harmonic emission of Ar, Ne and He atoms is measured by XUV interferometry with temporal resolution of 6 as. This measurement provides a direct insight into the quantum properties of the photoelectron wavefunctions.
A collection of hot rubidium atoms is shown to exhibit non-reciprocal optical transmission due to the interplay between thermal motion and electromagnetically induced transparency.
Applications for optical fibre sensors have evolved beyond physical measurements in the defence, oil, gas and civil engineering sectors to tackle new opportunities in chemical detection.
Optical fibre technology transformed telecommunications, leading to the global broadband Internet, and beyond. Charles Kuen Kao is the father of optical fibre communications whose vision changed the world.
This Review discusses emerging applications of photonic quantum sensing. The theoretical and experimental developments of quantum reading of classical data, quantum illumination of targets, and optical resolution beyond the Rayleigh limit are described.
A second harmonic with a conversion efficiency of 0.049% W−1, originating from surface nonlinearity and bulk multipole response in a silica whispering-gallery microcavity, is observed with a continuous-wave pump power below 1 mW.
A broadband-light storage technique using the Autler–Townes effect is demonstrated in a system of cold Rb atoms. It overcomes both inherent and technical limitations of the established schemes for high-speed and long-lived optical quantum memories.
A quantum walker on a hexagonal glued array of optical waveguides is made inside a glass substrate. The optimal hitting time increases linearly with the layer depth, giving a quadratic speed-up over the hitting performance by classical random walks.