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

Observing changes in the chirality of molecules in real time

Some molecules can exist in two mirror-image forms, similar to our hands. Although such so-called enantiomers have almost identical physical properties, they are not the same. The fact that they behave to each other like ...

Few-cycle pulses break the 300 W barrier

A team led by researchers from the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI), Laser-Laboratorium Göttingen (LLG) and Active Fiber Systems (AFS) has generated multi-millijoule 3-cycle pulses ...

A milestone in ultrashort-pulse laser oscillators

With the demonstration of a sub-picosecond thin-disk laser oscillator delivering a record-high 350-watt average output power, physicists at ETH Zurich set a new benchmark and pave the path toward even more powerful lasers.

Turbulence creates ice in clouds

Vertical air motions increase ice formation in mixed-phase clouds. This correlation was predicted theoretically for a long time, but can now be observed for the first time in nature. This research was published by a team ...

Photosynthesis seen in a new light by rapid X-ray pulses

The ability to transform sunlight into energy is one of Nature's more remarkable feats. Scientists understand the basic process of photosynthesis, but many crucial details remain elusive, occurring at dimensions and fleeting ...

New printer creates extremely realistic colorful holograms

Researchers have developed a new printer that produces digital 3-D holograms with an unprecedented level of detail and realistic color. The new printer could be used to make high-resolution color recreations of objects or ...

page 1 from 23

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