Related topics: laser

Gravitational wave, Venus missions get European green light

The European Space Agency gave the green light to two missions on Thursday, one to detect ripples in spacetime called gravitational waves and another to probe the secrets of Earth's closest neighboring planet Venus.

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.

How could laser-driven lightsails remain stable?

It's a long way to the nearest star, which means conventional rockets won't get us there. The fuel requirements would make our ship prohibitively heavy. So an alternative is to travel light. Literally. Rather than carrying ...

Beam me up: Using lasers to detect moth migrations

The year is 1941. The British military is installing new-age radar systems to detect German aircraft bound for Great Britain, intent on destruction. Fast forward to 2024. Researchers at North Carolina State University are ...

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.

This text uses material from Wikipedia, licensed under CC BY-SA