Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) and Technical University of ...

A team at Harvard and Vienna University of Technology have invented a new tunable laser that uses a series of rings to smoothly emit many light wavelengths from a single chip. The laser could replace ...

Similar columns of light above Belgorod have been reported before—yellow columns stretching into the sky—and have been explained by local media as a meteorological phenomenon, an explanation ...

Lasers, LEDs and light sources are devices that create light. LEDs (light emitting diodes) convert an electrical current into light using spontaneous emission in optically active semiconductors.

Researchers at Columbia Engineering’s Lipson Nanophotonics Group have created visible lasers of very pure colors from near-ultraviolet to near-infrared that fit on a fingertip. The colors of the ...

High-performance visible-light lasers that fit on a fingertip. ScienceDaily. Retrieved May 7, 2025 from www.sciencedaily.com / releases / 2023 / 01 / 230104135615.htm.

Integrated laser platform: A single chip generates narrow linewidth and tuneable visible light covering all colours. (Courtesy: Myles Marshall/Columbia Engineering) Researchers in the US have created ...

On a laser I have, 900 mW input electrical power yields almost 50 mW in green light, so about 10% efficient. Not so bad for a laser. Darned good considering it includes a doubler.

A team of scientists has found that the narrow beam of a laser, under specific conditions, can cast a shadow — a counterintuitive finding that could open the doors for new applications of ...