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Monday, January 23, 2023

This Week in Physics — Air Waveguide from “Donut” Laser Beams

 

This Week in Physics Magazine — January 23, 2023

Viewpoint

Air Waveguide from "Donut" Laser Beams

Ya Cheng – January 23, 2023

A waveguide sculpted in air with lasers transmits light over a distance of nearly 50 meters, which is 60 times farther than previous air-waveguide schemes.

Research News

A Laser-Based "Lightning Rod"

January 23, 2023

Experiments on a Swiss mountain demonstrate that a high-powered laser can influence the trajectory of lightning strikes—a step toward laser-based lightning protection.

Focus

Sound Waves Mimic Gravity

January 20, 2023

A recently discovered acoustic effect allows a hot gas to simulate the gravity-induced convection within a star or giant planet.

Research News

Massive Star Formation Displays Self-Control

January 19, 2023

New observations of a stellar nursery highlight a self-regulation mechanism that appears to resolve discrepancies between simulated and observed efficiencies of star formation.

synopsis

No-Show for Cosmic-Ray-Boosted, Lightweight Dark Matter

January 18, 2023

Interactions with cosmic rays could make low-mass dark matter particles detectable by neutrino observatories. But an analysis of two decades' worth of data shows no signs of the particles.

synopsis

A Nonlinear Cavity Cools a Cantilever

January 17, 2023

Photons in a nonlinear cavity perform "negative" work on a mechanical oscillator, cooling it toward its ground state.

synopsis

A Salt-Based Laser Color Converter

January 19, 2023

Artificial salts that are liquid at room temperature can be used to efficiently tune the wavelength of a laser source.



 

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