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Exciting Breakthrough in 2D Lasers

An important step towards next-generation ultra-compact photonic and optoelectronic devices has been taken with the realization of a two-dimensional excitonic laser. Berkeley Lab researchers have embedded a monolayer of tungsten disulfide into a microdisk resonator to achieve bright excitonic lasing at visible light wavelengths.

World Record for Compact Particle Accelerator

Using one of the most powerful lasers in the world, Berkeley Lab researchers have accelerated subatomic particles to the highest energies ever recorded. They used an emerging class of compact particle accelerator that physicists believe can shrink traditional, miles-long accelerators to machines that can fit on a table.

Lord of the Microrings

Berkeley Lab researchers report a significant breakthrough in laser technology with the development of a unique microring laser cavity that can produce single-mode lasing on demand. This advance holds ramifications for a wide range of optoelectronic applications including metrology and interferometry, data storage and communications, and high-resolution spectroscopy.

APEX: Superior Beams at a Million Pulses per Second

APEX: Superior Beams at a Million Pulses per Second

Surprising Control over Photoelectrons from a Topological Insulator

Electrons flowing swiftly across the surface of topological insulators (TIs) are “spin polarized,” their spin and momentum locked. This new way to control electron distribution in spintronic devices makes TIs a hot topic in materials science. Now Berkeley Lab scientists have discovered more surprises: contrary to assumptions, the spin polarization of photoemitted electrons from a topological insulator is wholly determined in three dimensions by the polarization of the incident light beam.

A Clock Einstein Would Have Loved

A very special clock that can measure time on the basis of the mass of a single atomic or even subatomic particle holds promise not only for ultraprecise measurements of mass and time, but also for such exotic applications as testing Einstein’s general theory of relativity, or the effects of gravity on antimatter. “We have

New Insight into an Intriguing State of Magnetism

Magnonics is an exciting extension of spintronics, promising novel ways of computing and storing magnetic data. What determines a material’s magnetic state is how electron spins are arranged (not everyday spin, but quantized angular momentum). If most of the spins point in the same direction, the material is ferromagnetic, like a refrigerator magnet. If half

Measuring Table-Top Accelerators’ State-of-the-Art Beams

“Slicing through the electron beam” is the second installment of a two-part feature about new techniques to test beam quality in laser plasma accelerators, including the metric known as slice-energy spread. As Berkeley Lab accelerator scientists meet the challenges of measuring extraordinarily short pulses in a complex environment, the approaching advent of the one-meter-long, 10-billion-electron-volt Berkeley Lab Laser Accelerator (BELLA) brings the promise of “table-top accelerators” closer to realization.

State-of-the-Art Beams From Table-Top Accelerators

“Emittance” is the first subject in a two-part feature about novel methods devised by Berkeley Lab scientists to test the quality of hard-to-assess beams from laser plasma accelerators. These table-top accelerators propel electron pulses to high energies within a few centimeters, promising far less expensive future accelerators with far less environmental impact than today’s conventional machines.

Synchronized Lasers Measure How Light Changes Matter

How matter responds to light lies at the core of vision, photosynthesis, solar cells and light-emitting diodes, and many other fields of scientific and practical import. But until now, it hasn’t been possible to see just how light does it. Berkeley Lab scientists have used SLAC’s Linac Coherent Light for the first demonstration that x-ray and optical wave mixing reveals not only structure but evolving charge states on the atomic scale.