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A relativistic electron beam with 1.9 pC charge is accelerated by copropagating with a terahertz pulse through two dielectric-loaded waveguides. The accelerating gradient in a single dielectric-loaded waveguide is 85 MV m−1. The total energy gain is 204 keV.
Ultralow-noise erbium:fibre comb technology allows the generation of a comb spanning six octaves, from the ultraviolet (350 nm) to the mid-infrared (22,500 nm), with a resolving power of 1010 across 0.86 PHz of bandwidth.
An optical ultrasound sensor based on a CMOS-compatible split-rib waveguide is demonstrated, offering high sensitivity, broadband detection (measured 3–30 MHz), small size (20 μm) and scalability to a fine-pitch matrix.
The counterpart of superradiance, called superabsorption, has now been observed. Superabsorption rates are much higher than that of ordinary absorption and may enable weak-signal exploitation.
The use of a non-unitary metasurface enables a new degree of freedom, allowing for dynamical and continuous control over the output quantum state and the effective quantum interaction of two single photons at will.
Through a dense krypton gas jet in the presence of a broadband near-infrared pulse, spectral compression of broadband XUV radiation between 145 and 130 nm wavelengths into a narrow-bandwidth XUV pulse at 100.3 nm wavelength by four-wave mixing is demonstrated.