Introduction to laser

Introduction of lasers:
"Laser light" redirects here. For the song, see LaserLight. For laser light show, see laser lighting display. For other uses, see Laser (disambiguation).
United States Air Force laser experiment
Red (660 & 635 nm), green (532 & 520 nm) and blue-violet (445 & 405 nm) lasers
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".[1][2] 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 coherently. 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. Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light. Temporal coherence can be used to produce pulses of light as short as a femtosecond.
Among their many applications, lasers are used in optical disk drives, laser printers, and barcode scanners; DNA sequencing instruments, fiber-optic and free-space optical communication; laser surgery and skin treatments; cutting and welding materials; military and law enforcement devices for marking targets and measuring range and speed; and laser lighting displays in entertainment.
Contents [hide]
1 Fundamentals
1.1 Terminology
2 Design
3 Laser physics
3.1 Stimulated emission
3.2 Gain medium and cavity
3.3 The light emitted
3.4 Quantum vs. classical emission processes
4 Continuous and pulsed modes of operation
4.1 Continuous wave operation
4.2 Pulsed operation
4.2.1 Q-switching
4.2.2 Mode-locking
4.2.3 Pulsed pumping
5 History
5.1 Foundations
5.2 Maser
5.3 Laser
5.4 Recent innovations
6 Types and operating principles
6.1 Gas lasers
6.1.1 Chemical lasers
6.1.2 Excimer lasers
6.2 Solid-state lasers
6.3 Fiber lasers
The word laser was coined as an acronym for Light Amplification by the Stimulated Emission of Radiation. The special nature of laser light has made laser technology a vital tool in nearly every aspect of everyday life including communications, entertainment,
manufacturing, and medicine.
Introduction to lasers
as we all know laser technology was developing day to day we must know the advantages and disadvantages of them and know the common useful developments of laser
U CAN KNOW MORE ABOUT LASERS AT:
www.explainthatstuff.com/lasers.html
spaceplace.nasa.gov/laser/en/
lasers.llnl.gov/education/how_lasers_work
science.howstuffworks.com/laser.htm
whatis.techtarget.com/definition/laser
www.rp-photonics.com/lasers.html
phet.colorado.edu/en/simulation/lasers
www.slideshare.net/Abybenz700/introduction-to-lasers
en.wikipedia.org/wiki/Laser
link.springer.com/book/10.1007%2F978-3-540-38954-5
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[@venkatesanselvaraj1725]

after watching so many videos.. ur explanation was crystal and clear.. kudos.. budddyyyy

[@basirasir4848]

Super sir ...Your Explanation of L-Light A-Amplification S-Stimulated E-Emission R-Radiation.

[@mzzaka_009]

Very nice and extremely informative video. Sir, you cleared my basic concept of LASER.

[@vikasdwivedi5502]

Ur concept is clear and way of explanation is great

[@mzzaka_009]

It is very easy to understand about LASER by this video.

[@sandhyaraninandala2192]

Excellent

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Thanks a lot sir Because of you i could understand the basic principle of laser...............

[@aishwaryakulkarni5823]

Has to be th3 best explanation ever on lasers ! Tysm

[@lalji1676]

Q1 When electrons , protons , neutrons Quarks , gasses and liquids dont have sex when they are exited , then why do humans have sex when they are exited ?

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Mind blowing and super exppaination sr

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[@pardeep.ksharma9136]

Very nice and informative. Nicely described. Thanku

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Wonderful teaching sir

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good job explaining!

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[@Aniaha-]

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Super explained

[@mzzaka_009]

Nicely Explained Sir... 👍

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[@pankajpushplearntoworld8883]

thqs for the knowledge

[@rachakondakishan67]

Excellent bro....

[@073_navyawilson2]

Thank you sir. It helped me

[@shanacp3738]

Nice explanation.thanks sir

[@nitindhiman5216]

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[@The_Gods_Beloved]

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sehr schöne erklärung

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Good work!

[@eTution]

thanks

[@-NAGARAJUV]

superb

[@Queen_shreyaanvee]

If u kindly explain about agron ion laser

[@irfansyed2191]

thx

[@ujjalghosh437]

But.Why dont the electron go to next excited state (E3) when we supply energy to (E2) in case of stimulated emission? Why does it come to the level (E1)?

[@attaurrahman6529]

very nice

[@sambitkumarparaseth3402]

I also have the same doubt

[@aisharawat9102]

Maybe its not sufficient ..I guess

[@nagboard]

Because of the same frequency of the photons I guess

[@world3077]

Because every electron like to be stable ... So the lower energy levels or states are more stable than the excited state or levels

[@KhushiSingh-ji8rw]

thnks sir very much...............................................................

[@subashsubashsubash]

Good work sir

[@eTution]

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[@RaNa-fh9yh]

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v nice

[@eTution]

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best

[@nancyjangra3055]

V nice.. It give basic knowledge of laser

[@chandu4764]

Sir .. laser is also is monochromatic light . But while you are teaching you are saying that " ordinary light or monochromatic light " at once and laser at once.. what is means is you are differentiating laser and monochromatic light but both are same no ?

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[@eTution]

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