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Origin of laser
Words nearby laser
Example sentences from the Web for laser
You can use powerful lasers to measure the distance of these objects, like radar or sonar.
This Raman spectroscopy shines laser light on a sample, then measures how the light bounces off.
SHERLOC, or Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals, will take similar measurements using an ultraviolet laser.NASA’s Perseverance rover will seek signs of past life on Mars|Lisa Grossman|July 28, 2020|Science News
In one incident, a man is accused of aiming a laser pointer at a police helicopter.Years Into Smart Streetlights Program, Council Will Write Surveillance Rules|Jesse Marx|July 9, 2020|Voice of San Diego
Carbon, oxygen, nitrogen and other more complex substances must be available for life to both evolve and build radio transmitters or lasers to send signals through space.Self-destructive civilizations may doom our search for alien intelligence|Tom Siegfried|July 6, 2020|Science News
Initially, it will be able to carry 1,000-pound satellite-guided bombs or 500-pound laser-guided weapons.New U.S. Stealth Jet Can’t Fire Its Gun Until 2019|Dave Majumdar|December 31, 2014|DAILY BEAST
Where these laser-like missiles are falling out of the sky onto a city and you have to stop each of them from hitting the targets?Coffee Talk with Ethan Hawke: On ‘Boyhood,’ Jennifer Lawrence, and Bill Clinton’s Urinal Exchange|Marlow Stern|December 27, 2014|DAILY BEAST
“The laser-wielding robot is a real threat,” Hetflaisz says.
Obama is widely believed to tap an ex-physicist who cuts military waste like a laser to become the next secretary of defense.Ashton Carter, the Wonk Who Would Lead the Pentagon|Shane Harris, Tim Mak|December 2, 2014|DAILY BEAST
Green laser pointers shined in the faces of men in uniforms looking down from the roof of the National Palace.
Then, as though finding an error, he halted its operation and swung the laser-head back away from the work piece.
Casually, without even looking at the Security man, he had somehow centered the laser directly on him.
The theory behind the heat projector was simply an extension of the laser theory, plus a few refinements.
Or, I should say, the thing that is supposed to look like a laser component.
It looked like a keychain laser-pointer, or maybe a novelty light-saber.Makers|Cory Doctorow
British Dictionary definitions for laser (1 of 2)
Word Origin for laser
British Dictionary definitions for laser (2 of 2)
Medical definitions for laser
Scientific definitions for laser
A Closer Look
A laser emits a thin, intense beam of nearly monochromatic visible or infrared light that can travel long distances without diffusing. Most light beams consist of many waves traveling in roughly the same direction, but the phases and polarizations of each individual wave (or photon) are randomly distributed. In laser light, the waves are all precisely in step, or in phase, with each other, and have the same polarization. Such light is called coherent. All of the photons that make up a laser beam are in the same quantum state. Lasers produce coherent light through a process called stimulated emission. The laser contains a chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into higher orbits with higher energy states. When one of these electrons jumps down to a lower energy state (which can happen spontaneously), it gives off its extra energy as a photon with a specific frequency. But this photon, upon encountering another atom with an excited electron, will stimulate that electron to jump down as well, emitting another photon with the same frequency as the first and in phase with it. This effect cascades through the chamber, constantly stimulating other atoms to emit yet more coherent photons. Mirrors at both ends of the chamber cause the light to bounce back and forth in the chamber, sweeping across the entire medium. If a sufficient number of atoms in the medium are maintained by some external energy source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of coherent photons develops. One of the mirrors is partially transparent, allowing the laser beam to exit from that end of the chamber. Lasers have many industrial, military, and scientific uses, including welding, target detection, microscopic photography, fiber optics, surgery, and optical instrumentation for surveying.
Cultural definitions for laser
A device that produces a very narrow, highly concentrated beam of light. Lasers have a variety of uses in such areas as surgery, welding and metal cutting, and sound and video recording and reproduction. The name is an acronym for light amplification by stimulated emission of radiation.