Guide-star-free imaging through turbid media is achieved by computational back-projection and averaging of as few as 25 holographically measured scattered fields under a random unknown illumination.

Deep-ultraviolet micro-light-emitting diodes based on aluminium gallium nitride are fabricated for maskless photolithography. The peak wavelength is 270 nm, and the 3 μm device achieved a peak external quantum efficiency of 5.7% and a maximum brightness of 396 W cm^–2.

Both laser stabilization and isolation are demonstrated simultaneously by using Kerr nonlinearity in a high-Q silicon nitride ring resonator to self-injection lock a distributed-feedback laser, bringing on-chip lasers closer to real-world fully integrated applications.

Polarization-entangled photon pairs are generated from two perpendicularly aligned two-dimensional crystals of NbOCl₂. The polarization-entangled state is measured with a fidelity up to 86%. The measured count rate normalized to pump power and interaction length is 472 Hz mW^−1 mm^−1.

Researchers demonstrate nonlinear Compton scattering in a strong laser field, in which a laser-accelerated multi-GeV electron scatters off hundreds of laser photons and converts them into a single gamma-ray photon with several-hundred-MeV energy.

A scalable quantum processor based on the discrete-time quantum walk of time-bin-entangled photon pairs on synthetic temporal photonic lattices is realized on a fibre-coupled loop system. Key fundamental quantum operations are demonstrated.

The mitigation of climate change requires major transformations in the ways we generate energy and operate technologies that release carbon dioxide. Photonic concepts and novel light-driven technologies provide many potential solutions, transforming our current modes of energy use into more effective and sustainable ones.

Nathalie Picqué, the new director at the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) in Berlin, Germany, tells us all we need to know about frequency combs and dual-comb spectroscopy, and shares with us some golden tips on becoming a successful scientist.

Joseph Izatt’s work advanced the science of imaging in biophotonics and brought optical coherence tomography imaging to the eye care of infants and children and, as live feedback for the surgeon, to ophthalmic microsurgery.

Following first lasing at LCLS-II — a coherent X-ray laser source driven by a 700-m superconducting linear accelerator — several upgrades are already in the works. Nature Photonics spoke to LCLS director Mike Dunne about LCLS-II commissioning hurdles as well as future plans.

Global proliferation of free-electron laser X-ray sources has improved accessibility. Now the race is on for high repetition rates, attosecond pulses, and full coherence.

We had all been wondering “where is Costas?” and now we learned that we shall not see him again. We have lost a good friend and leader in the photonics community.