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The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Laser
Videos
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser originated as an acronym for light amplifi
A telescope in the Very Large Telescope system producing four orange laser guide stars
A telescope in the Very Large Telescope system producing four orange laser guide stars
A laser can produce a very narrow beam of light of a single wavelength, in this case, green.
A laser can produce a very narrow beam of light of a single wavelength, in this case, green.
A helium–neon laser demonstration. The glow running through the center of the tube is an electric discharge. This glowing plasma is the gain medium fo
A helium–neon laser demonstration. The glow running through the center of the tube is an electric discharge. This glowing plasma is the gain medium for the laser. The laser produces a tiny, intense spot on the screen to the right. The center of the spot appears white because the image is overexposed there.
Red (660 & 635 nm), green (532 & 520 nm), and blue-violet (445 & 405 nm) lasers
Red (660 & 635 nm), green (532 & 520 nm), and blue-violet (445 & 405 nm) lasers
Maser
Videos
A maser is a device that produces coherent electromagnetic waves through amplification by stimulated emission. The term is an acronym for microwave amplification by stimulated emission of radiation. N
Laser
…greatest inventions of the 20th century. The first device using amplification by stimulated emission operated at microwave frequencies, and was called a maser, for "microwave amplification by stimulated emission of radiation". When similar optical devices were developed they were first called optical masers…
The first prototype ammonia maser in front of its inventor Charles H. Townes. The ammonia nozzle is at left in the box, the four brass rods at center
The first prototype ammonia maser in front of its inventor Charles H. Townes. The ammonia nozzle is at left in the box, the four brass rods at center are the quadrupole state selector, and the resonant cavity is at right. The 24 GHz microwaves exit through the vertical waveguide Townes is adjusting. At bottom are the vacuum pumps.
Aurorae on the north pole of Jupiter generate cyclotron masers (Hubble)
Aurorae on the north pole of Jupiter generate cyclotron masers (Hubble)