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The laser works by the same principle as the maser, but produces higher-frequency coherent radiation at visible wavelengths. The maser was the precursor to the laser, inspiring theoretical work by Townes and Arthur Leonard Schawlow that led to the invention of the laser in 1960 by Theodore Maiman. When the coherent optical oscillator was first ...
An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum.
Charles Hard Townes (July 28, 1915 – January 27, 2015) was an American physicist. [4] [5] Townes worked on the theory and application of the maser, for which he obtained the fundamental patent, and other work in quantum electronics associated with both maser and laser devices.
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. Overview [ edit ]
Richard Masur (born November 20, 1948) is an American character actor who has appeared in more than 40 films. From 1995 to 1999, he served two terms as president of the Screen Actors Guild (SAG).
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". [11] When similar optical devices were developed they were first called optical masers, until "microwave" was replaced by "light" in the acronym, to become laser.
In 1984, water maser emission was discovered in NGC 4258 and NGC 1068 that was of comparable strength to the hydroxyl maser in Arp 220, and are as such considered water megamasers. [12] Over the next decade, megamasers were also discovered for formaldehyde (H 2 CO) and methine (CH). Galactic formaldehyde masers are relatively rare, and more ...
The gyrotron is a type of free-electron maser that generates high-frequency electromagnetic radiation by stimulated cyclotron resonance of electrons moving through a strong magnetic field. [4] [5] It can produce high power at millimeter wavelengths because, as a fast-wave device, its dimensions can be much larger than the wavelength of the ...