What is Laser?

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". The first laser was built in 1960 by Theodore H. Maiman at Hughes 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; 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.

Questions and answers on "Laser"

hi..female 22 years old...and I want to remove favors from face without surgery these can be done by laser or there is any way to be removed...

doctor1 MD

it is possible to remove it without surgery.
laser r there to remove hair permanent
u need to take average 8-10 session of laser
result depend...

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im 14 yrs old am i able for a laser treatment? hi im 14 years old and i wanted to know if i was elligible for a laser treatment for my upper lip.

doctor1 MD


Side Effects for Teenagers:

The side effects of laser hair removal have been lessened tremendously with the latest IPL technology. However,...

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Hi doctor I am 38 years and I have pigmentation on both of my cheeks for the last 2 - 3 years. what should do. will laser remedy solve my problem ?

doctor1 MD

Hi...Mr.Shaalu Bedi..,
welcome to HCM..,
Thanks for query..,
38 years old ...and pigmentation of both could be..,

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