Definitions for Lasers
lasers

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1. lasers

   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" is an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow.A laser differs from other sources of light in that it emits light which is coherent. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers and lidar (light detection and ranging). Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum. Alternatively, temporal coherence can be used to produce ultrashort pulses of light with a broad spectrum but durations as short as a femtosecond. Lasers are used in optical disc drives, laser printers, barcode scanners, DNA sequencing instruments, fiber-optic and free-space optical communication, semiconducting chip manufacturing (photolithography), laser surgery and skin treatments, cutting and welding materials, military and law enforcement devices for marking targets and measuring range and speed, and in laser lighting displays for entertainment. Semiconductor lasers in the blue to near-UV have also been used in place of light-emitting diodes (LEDs) to excite fluorescence as a white light source. This permits a much smaller emitting area due to the much greater radiance of a laser and avoids the droop suffered by LEDs; such devices are already used in some car headlamps.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Lasers

   An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.

How to pronounce Lasers?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

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   Fred

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   Tessa

   South African

How to say Lasers in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of Lasers in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of Lasers in Pythagorean Numerology is: 2

Examples of Lasers in a Sentence

1. skyla:

   invention the plasma gun I'd like to see that invention. its a plasma gun that shoot's out beams of white lasers or something.

2. Keoki Jackson:

   Fiber-optics lasers are revolutionizing direct energy systems, we are investing in every component of the system – from the optics and beam control to the laser itself – to drive size, weight, and power efficiencies.

3. Tom Painter:

   The scanning LIDAR is a fancy laser pointer, essentially, that sprays out laser pulses – about 500,000 pulses per second – flying along at 23,000 feet, and measures how long it takes for the laser pulse to go out, hit the surface and come back, and we can use that information to then know the surface of the snow. Every square foot of mountain snow is touched by our lasers.

4. Dr Jaffe:

   Unfortunately, too, from a public relations standpoint, both microwaves and lasers have negative connotations for most people because they associate microwaves with the oven in their kitchen and lasers with science fiction space battles.

5. Ken Cuccinellisaid:

   Later that night, Kelly was arrested by police and taken to jail. Police officers have frequently encountered dangerous lasers during protests across the country. ADepartment of Homeland Security report on the Portland protests mentions lasers being targeted at police or aircraft at least eight times. CLICK HERE TO GET THE FOX NEWS APP Acting Deputy Secretary of the Department of Homeland Security, Ken Cuccinellisaid that multiple federal officers weretemporarily blinded by lasers during Portland protests. Weve had a number of officers who have days-long blindness. So far theyve all kind of come back, if you will, you also get whats called flash blindness, think of it as the old Kodak cameras where youd get that blue spot and you cant quite see your entire field of vision for a period of time.

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References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Lasers