Related topics: light · laser beam · atoms · wavelength · nature photonics

Commercial US spaceship hours from attempted Moon landing

A Houston-based company is set Thursday to land America's first spaceship on the Moon in more than 50 years, part of a new fleet of NASA-funded, uncrewed, commercial robots meant to pave the way for astronaut missions this ...

Junk DNA in birds may hold key to safe, efficient gene therapy

The recent approval of a CRISPR-Cas9 therapy for sickle cell disease demonstrates that gene editing tools can do a superb job of knocking out genes to cure hereditary disease. But it's still not possible to insert whole genes ...

Japanese space debris inspection probe launched

A Japanese firm said Monday it had successfully launched a spacecraft tasked with inspecting potentially dangerous man-made junk floating around the Earth.

Research team discovers two-dimensional waveguides

The U.S. Naval Research Laboratory (NRL), in collaboration with Kansas State University, has discovered slab waveguides based on the two-dimensional material hexagonal boron nitride. This milestone has been reported in the ...

How NASA uses simple technology to track lunar missions

NASA is using a simple but effective technology called Laser Retroreflective Arrays (LRAs) to determine the locations of lunar landers more accurately. They will be attached to most of the landers from United States companies ...

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Laser

A laser is a device that emits light (electromagnetic radiation) through a process called stimulated emission. The term laser is an acronym for light amplification by stimulated emission of radiation. Laser light is usually spatially coherent, which means that the light either is emitted in a narrow, low-divergence beam, or can be converted into one with the help of optical components such as lenses. Typically, lasers are thought of as emitting light with a narrow wavelength spectrum ("monochromatic" light). This is not true of all lasers, however: some emit light with a broad spectrum, while others emit light at multiple distinct wavelengths simultaneously. The coherence of typical laser emission is distinctive. Most other light sources emit incoherent light, which has a phase that varies randomly with time and position.

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