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
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)
Hydrogen maser
Videos
A hydrogen maser, also known as hydrogen frequency standard, is a specific type of maser that uses the intrinsic properties of the hydrogen atom to serve as a precision frequency reference.
Maser
…amplifying medium in a resonant cavity, feedback is created that can produce coherent radiation. Atomic beam masers Ammonia maser Free electron maser Hydrogen maser Gas masers Rubidium maser…
An exposed hydrogen maser
A passive hydrogen maser used as a clock in Galileo satellite navigation system
A hydrogen maser used by BeiDou-3