what is LASER?How it works?

Answer 1

Light Amplification by Stimulated Emission of Radiation

Answer 2

A LASER (from the acronym of Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam.

In analogy with optical lasers, a device which produces any particles or electromagnetic radiation in a coherent state is also called a "laser", usually with indication of type of particle as prefix (for example, atom laser.) In most cases, "laser" refers to a source of coherent photons, i.e. light or other electromagnetic radiation.

Laser light is typically near-monochromatic, i.e., consisting of a single wavelength or color, and emitted in a narrow beam. This contrasts with common light sources, such as the incandescent light bulb, which emit incoherent photons in almost all directions, usually over a wide spectrum of wavelengths.

Laser action is explained by the theories of quantum mechanics and thermodynamics. Many materials have been found to have the required characteristics to form the laser gain medium needed to power a laser, and these have led to the invention of many types of lasers with different characteristics suitable for different applications.

Answer 3

A LASER (from the acronym of Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in losing the capitalization in the process. The back-formed verb lase means "to produce laser light" or "to apply laser light to".[1]

In analogy with optical lasers, a device which produces any particles or electromagnetic radiation in a coherent state is also called a "laser", usually with indication of type of particle as prefix (for example, atom laser.) In most cases, "laser" refers to a source of coherent photons, i.e. light or other electromagnetic radiation.

Laser light is typically near-monochromatic, i.e., consisting of a single wavelength or color, and emitted in a narrow beam. This contrasts with common light sources, such as the incandescent light bulb, which emit incoherent photons in almost all directions, usually over a wide spectrum of wavelengths.

Laser action is explained by the theories of quantum mechanics and thermodynamics. Many materials have been found to have the required characteristics to form the laser gain medium needed to power a laser, and these have led to the invention of many types of lasers with different characteristics suitable for different applications.

The laser was proposed as a variation of the maser principle in the late 1950s, and the first laser was demonstrated in 1960. Since that time, laser manufacture has become a multi-billion dollar industry, and the laser has found applications in fields including science, the defense industry, industry, medicine, and consumer electronics.

Answer 4

Light Amplification by Stimulated Emission of Radiation...

It depends upon the type of laser you are talking about as to how it works.. In gas lasers (it works somewhat like this) they pump one gas up in voltage and a heavy gas causes a lighter gas to emit radiation.. they then bounce this light between two mirrors that are perfectly parallel.. one of the mirrors is about 80% mirrored (so it lets 20% of the light out of the laser tube) and the other is 100% mirrored...

In gem lasers (like ruby lasers) they cut a ruby rod with perfectly parallel ends and mirror them about the same as the above gas lasers.. and they surround the ruby with a strobe light that fires or pulses.. the light hitting the ruby with such intensity causes the ruby to lase or give off laser light...

laser light is of one frequency and is coherent or in phase...

there are now laser diodes which give off laser light but I'm not familiar with how they work at all.

Answer 5

LASER stands for Light amplification by Stimulated Emission of Radiations..

Answer 6

LASER: A medical instrument that produces a powerful beam of light and can produce intense heat when focused at close range. Lasers are often used in surgery to vaporize tissue.

Look on to this site to know what is Laser is

http://searchsmb.techtarget.com/sDefinition/0,,sid44_gci214527,00.html

Look on to this site how the Laser works?

http://www.llnl.gov/nif/library/aboutlasers/how.html

I hope it help u

Answer 7

LASER (Light Amplification by Stimulated Emission of Radiation) is a technique with which a concentrated Light is produced.

When i say "a concentrated", i mean....

When an electron absorbs energy, it reaches higher orbital. But it cant remain in that level forever. It falls back exerting energy (it utilizes/ wastes a minute energy though) in the forms of Heat and Light. When a bunch of electrons fall back in their original orbitals randomly....ordinary light is produced.

But when these electrons are stimulated/controlled and made to reach a common intermediate level and made to fall into their original orbital AT-A-TIME, LASER is produced. It is a kind of tunneling energy.

hope it helps you.

Answer 8

The word "laser" stands for "light amplification by stimulated emission of radiation." Lasers are possible because of the way light interacts with electrons. Electrons exist at specific energy levels or states characteristic of that particular atom or molecule. The energy levels can be imagined as rings or orbits around a nucleus. Electrons in outer rings are at higher energy levels than those in inner rings. Electrons can be bumped up to higher energy levels by the injection of energy-for example, by a flash of light. When an electron drops from an outer to an inner level, "excess" energy is given off as light. The wavelength or color of the emitted light is precisely related to the amount of energy released. Depending on the particular lasing material being used, specific wavelengths of light are absorbed (to energize or excite the electrons) and specific wavelengths are emitted (when the electrons fall back to their initial level).

The ruby laser was the first laser invented in 1960. Ruby is an aluminum oxide crystal in which some of the aluminum atoms have been replaced with chromium atoms. Chromium gives ruby its characteristic red color and is responsible for the lasing behavior of the crystal. Chromium atoms absorb green and blue light and emit or reflect only red light.

For a ruby laser, a crystal of ruby is formed into a cylinder. A fully reflecting mirror is placed on one end and a partially reflecting mirror on the other. A high-intensity lamp is spiraled around the ruby cylinder to provide a flash of white light that triggers the laser action. The green and blue wavelengths in the flash excite electrons in the chromium atoms to a higher energy level. Upon returning to their normal state, the electrons emit their characteristic ruby-red light. The mirrors reflect some of this light back and forth inside the ruby crystal, stimulating other excited chromium atoms to produce more red light, until the light pulse builds up to high power and drains the energy stored in the crystal.

The laser flash that escapes through the partially reflecting mirror lasts for only about 300 millionths of a second-but very intense. Early lasers could produce peak powers of some ten thousand watts. Modern lasers can produce pulses that are billions of times more powerful.

Another characteristic of laser light is that it is coherent. That is, the emitted light waves are in phase with one another and are so nearly parallel that they can travel for long distances without spreading. (In contrast, incoherent light from a light bulb diffuses in all directions.) Coherence means that laser light can be focused with great precision.

Many different materials can be used as lasers. Some, like the ruby laser, emit short pulses of laser light. Others, like helium-neon gas lasers or liquid dye lasers emit a continuous beam of light. Our ICF lasers, like the ruby laser, are solid-state, pulsed lasers.

Answer 9

Light
Amplified by the
Stimulated
Emission
Radiation