What are lasers? what are their application?

Question

What are lasers? what are their application?

Answer 1

LASER= Light Amplification by Stimulated Emmission of Radiation

MASER=Microwave Amplification by Stimulated Emmission of Radiation

All these technologies have applications in Medical, Engineering ,Defence and Agricultural fields.

Laser bombing was done by India during last Indo-Pak war. Laser is used for micro surgery, especially in corneal transplantation.

Answer 2

lasers actually stand for light amplification for stimulated emission radiation. They can be considered as a bunch of light beams travelling with similar or one can say same frequency and wavelength. This very characteristic increases the intensity of lasers..........

Lasers can penetrate surfaces so they are used for surgeries which involve removal of stone etc. They do not leave any body marks............. They are also used for measuring distances(speed=distance/time). . . if the speed and time are  known we can easily calculate the distance. . . They are also used for security purposes as is shown in a lot of movies dese days...................

Answer 3

A device which generates an extremely intense, small and nearly nondivergent beam of monochromatic radiation in the visible region, with all the waves in phase; capable of mobilizing immense heat and power when focused at close range, it is used as a tool in surgery, in diagnosis, and in physiological studies. Laser is an acronym for light amplification by stimulated emission of radiation.

Used also as a modern version of acupuncture and considered to be the biggest breakthrough in that technology for 5000 years. It provides a quick, painless and noninvasive method of point stimulation.

argon l. — used in ophthalmic surgery and in photodynamic surgery of the skin.

carbon dioxide l. — used in microsurgery and ophthalmic procedures.

low-energy l. therapy — used for wound healing and pain relief; includes visible red helium-neon lasers, invisible infrared gallium-arsenide lasers and gallium-aluminum-arsenid lasers.

l. therapy — in acupuncture the application of low intensity laser to acupuncture points.

All the best :)

Answer 4

The term "laser" is an acronym for Light Amplification by Stimulated Emission of Radiation. A typical laser emits light in a narrow, low-divergence monochromatic, beam with a well-defined wavelength. In this way, laser light is in contrast to a light source such as the incandescent light bulb, which emits light over a wide area and over a wide spectrum of wavelengths. In a laser or maser, the atoms or molecules are excited so that more of them are at higher energy levels than are at lower energy levels, a condition known as an inverted population.

The process of adding energy to produce an inverted population is called pumping. Once the atoms or molecules are in this excited state, they readily emit radiation.The physical size of a laser depends on the materials used for light emission, on its power output, and on whether the light is emitted in pulses or as a steady beam.

If a photon whose frequency corresponds to the energy difference between the excited state and the ground state strikes an excited atom, the atom is stimulated to emit a second photon of the same frequency, in phase with and in the same direction as the bombarding photon. The bombarding photon and the emitted photon may then each strike other excited atoms, stimulating further emissions of photons, all of the same frequency and all in phase. This produces a sudden burst of coherent radiation as all the atoms discharge in a rapid chain reaction. Often the laser is constructed so that the emitted light is reflected between opposite ends of a resonant cavity; an intense, highly focused light beam passes out through one end, which is only partially reflecting. If the atoms are pumped back to an excited state as soon as they are discharged, a steady beam of coherent light is produced.

The light beam produced by most lasers is pencil-sized, and maintains its size and direction over very large distances; this sharply focused beam of coherent light is suitable for a wide variety of applications.

Lasers have been used in industry for cutting and boring metals and other materials, and for inspecting optical equipment. In medicine, they have been used in surgical operations.

Lasers have been used in several kinds of scientific research. The field of holography is based on the fact that actual wave-front patterns, captured in a photographic image of an object illuminated with laser light, can be reconstructed to produce a three-dimensional image of the object. Lasers have also been used in plasma physics and chemistry.

Answer 5

can i just state any use of lasers?

i heard lasers are used in hospital for surgery, like

if u want to remove a dot from ur skin, u can do it with

a laser, or something like that.