lasers
Laser stands for Light Amplification by the Stimulated Emission of Radiation. Lasers work by producing an intense beam of bright light that travels in one direction. The laser has the unique ability to produce one specific color or wavelength of light, which can be varied in its intensity and pulse duration. The newest laser systems have become remarkably precise and selective, allowing treatment results and safety levels not previously available. All lasers contain an energized substance that can increase the intensity of light that passes through it. This substance is called the amplifying medium and it can be a solid, a liquid or a gas. Einstein can be considered as the father of the laser. 80 years ago he postulated photons and stimulated emission and won the Nobel Prize for related research on the photoelectric effect. This section discusses the historical evolution from microwave lasers to optical lasers and finally to x-ray lasers and lasers discovered in space. Some theorists were on the right track, especially Planck, who proposed that nature acted by using "quanta" of energy. But it was the young, unknown Albert Einstein who explained everything and started the field of quantum mech
The laser has been used in the medical field as well. This revolutionary technology actually vaporizes the undesired skin tissue, one layer at a time, revealing fresh skin underneath. The CO2 laser's highly focused aim enables the dermatological surgeon to gently remove the skin's surface with a low risk of scarring and complications in properly selected patients. The laser beam can gently vaporize and remove wrinkles, scars and blemishes, seal blood vessels or cut skin tissue. Lasers can also be used in defense. For example the use of the laser attatched onto a satellite would enable us to destroy incoming or airborne missiles before they reach their target. Even though our government wasted millions of taxpayers money on the laser defense systems, they could waste more on developing new and improved satellites, or maybe even working ones too. An alternate technique for boost-phase interception requires that space interceptors be constantly over the enemy territory. Keeping a sufficient number of interceptors continuously ready for action and over the enemy territory is costly, although not impossible. Advances in technology -- lasers, neutral particle beams, non-nuclear "smart" weapons -- make it possible to attack missiles as they rise. In order to increase the intensity of the light, we would need to energize the amplifying medium, or in other terms, pumping. There are several ways of pumping an amplifying medium. When the amplifying medium is a solid, pumping is usually achieved by irradiating it with intense light. This light is absorbed by atoms or ions within the medium and raises them into higher energy states. Often, the pumping light comes from xenon-filled flash tubes that are positioned alongside the amplifying medium. Passing a high voltage elec
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Approximate Word count = 1196
Approximate Pages = 5 (250 words per page double spaced)
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