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Lasers And Their Applications - College Papers

Lasers And Their Applications


Laser is an acronym for light amplification by stimulated emission of radiation. In the last century many types of lasers have been used for many different applications from welding to surgery to military and even many uses in every day life by harnessing the principles of light and stimulated emission.
To understand how lasers work we must first understand the physics behind light waves. Light is emitted from a source and travels in straight lines and when it strikes an object is either absorbed, reflected, or refracted. Light behaves primarily like a wave and its this wave nature of light that allows lasers to work. Constructive interference is what amplifies light. Since light is ...

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is the process that the laser works on, which was first proposed by Albert Einstein in 1917. When a sufficient number of atoms, either gas solid or liquid, absorb energy so that they are in an excited state of higher energy stimulated emission can occur. Light of a specific wavelength can produce more light with the same phase and direction these light waves will be coherent. Stimulated emission amplifies the coherency of this radiation and gives the radiation a very narrow beam spread.
The combination of light amplification and stimulated emission creates a laser. Laser light is coherent because the atoms are stimulated to emit waves of light that are in phase creating constructive interference producing a powerful and intense laser light. The emitted light is monochromatic, meaning only one wavelength, and one directional. For a laser to work three components are needed. First a gain medium that can amplify light through it. Second an energy pump source to create a ...

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generate bursts of light over a short period of time. These short bursts are useful for studying physical phenomena over a extremely short time interval. The frequency of these lasers fall in the infrared spectrum, but can be multiplied to ultraviolet by multiplying the laser with potassium dihydrogen phosphate and X-ray wavelengths by aiming the beams at yttrium.




Gas lasers have a medium of pure gas, a mixture of gases or metal vapor enclosed in a glass or quartz tube with one fully reflective mirror and one partially reflective mirror (see illustration above). Gas lasers are pumped by ultraviolet light, electric current, chemical reactions, or electron beams. Some gas ...

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PAPER DETAILS
Added: 8/14/2007 05:04:30 AM
Category: Science & Nature
Type: Premium Paper
Words: 1998
Pages: 8

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