whats the use of laser?

Answer 1

More information can be had from the source:
When lasers were invented in 1960, they were called "a solution looking for a problem". Since then, they have become ubiquitous, finding utility in thousands of highly varied applications in every section of modern society, including consumer electronics, information technology, science, medicine, industry, law enforcement, entertainment, and the military.

The first application of lasers visible in the daily lives of the general population was the supermarket barcode scanner, introduced in 1974. The laserdisc player, introduced in 1978, was the first successful consumer product to include a laser, but the compact disc player was the first laser-equipped device to become truly common in consumers' homes, beginning in 1982, followed shortly by laser printers.

In 2004, excluding diode lasers, approximately 131,000 lasers were sold world-wide, with a value of US$2.19 billion In the same year, approximately 733 million diode lasers, valued at $3.20 billion, were sold
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Answer 2

Laser finds various applications. When lasers were invented in 1960, they were called "a solution looking for a problem". Since then, they have become ubiquitous, finding utility in thousands of highly varied applications in every section of modern society, including consumer electronics, information technology, science, medicine, industry, law enforcement, entertainment, and the military.

The first application of lasers visible in the daily lives of the general population was the supermarket barcode scanner, introduced in 1974. The laserdisc player, introduced in 1978, was the first successful consumer product to include a laser, but the compact disc player was the first laser-equipped device to become truly common in consumers' homes, beginning in 1982, followed shortly by laser printers.

In 2004, excluding diode lasers, approximately 131,000 lasers were sold world-wide, with a value of US$2.19 billion.[10] In the same year, approximately 733 million diode lasers, valued at $3.20 billion, were sold.

In recent years, some hobbyists have taken interests in lasers. Lasers used by hobbyists are generally of class IIIa or IIIb, although some have made their own class IV types. However, compared to other hobbyists, laser hobbyists are far less common, due to the cost and potential dangers involved.

Popping balloons, lighting matches, and doing laser shows appear to be popular among laser enthusiasts. Laser show enthusiasts often use Electronica music, such as techno and trance.

Due to the cost of lasers, some hobbyists use cheaper means to obtain lasers, such as extracting diodes from DVD burners.

Answer 3

All lasers emit a beam of visible light. It sounds like what you are really asking for is something where you can see the beam from the side. You CAN'T do that without particulate matter (fog, smoke, dust) in the air. Think about it. If you are able to see a laser beam from the side, it means that some light photons are leaving the beam and traveling to your eye. (Because you can't see something unless photons enter your eye.) But that can only happen if the photon changed direction after it got emitted from the laser. That is, you're holding the laser at position A and pointing it toward B. Photons stream out from A and start moving in the direction toward B. If you are standing at some third position, C, then NONE of the photons will enter your eye (i.e. you won't see the beam) UNLESS some photons BOUNCE OFF of something in the air, change direction, and start heading toward "C". "Beam visibility" (from the side) implies "beam interruption" (by particulate matter in the air). There is no way around it.

Answer 4

Laser is a high intensity electromagnetic pulse that has applications is all fields. For example, laser is used in CD/DVD drives to read and to write data. It is used to cut holes in diamonds. It is used to make holograms. It is being implemented in the field of astronomy to find out the exact istance between the earth and the moon.

Answer 5

Fiber optic communication, interferometry (measuring distances), alignment (like a gun sight), laser pointers, blowing up rebel planets, light shows, optical scanners (like at the checkout counter or in DVD's), heating things (welding, machining, inertial confinement fusion), triggering systems (alarms, garage door safety trips), and (my dog's favorite) chasing the spot.

Answer 6

Couple of nice lifts from Wikipedia there.

Drill multiple tiny holes in sheet metal for jet engine use, simultaneous cutting and welding of plastic sheets and synthetic cloth, also, believe it or not, for cutting out pizza bases from rolled out dough. Eye surgery to "weld" detached retinas back to the rear of the eye, reshaping of corneas to treat myopia, presbyopia and astigmatism, treatment of skin cancer after injection of dyes to the cancer. Chemical equipment like Raman spectroscopes. Surveyors measure distances and police measure vehicle speed. Measure distance of the Moon from reflectors left there by Apollo astronauts.

So, basically, they are useless..

Answer 7

laser is an high intesity beam. which is used in all fields.

Answer 8

You have one in the cd/dvd drive in your computer.