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 a wave it has a frequency calculated by the equation: where f is the frequency c is the speed of light which is equal to 3.00 x 108 m/s and is the wave length of light. Also waves have crests, the high points of waves, and troughs, the low points. Constructive interference occurs when two waves of the same frequency meet at a crest or trough therefore combining to form a wave that has an amplitude equal to the sum of the individual amplitudes of the original waves. Stimulated emission is the process that th
e laser works on, which was first proposed by Albert Einstein in 1917. It's used for drilling and cutting gems like diamond by use of a laser drill or laser scriber, to construct and shape machine tools, precisely cut fabrics, synthesize new materials, and to attempt to induce controlled nuclear reactions. A server motor position an objective lense to a track on the disk the laser then directs a narrow beam of light on to the track along the track regions with pits scatter light in different directions. A lasers use is only restricted by the cost to run it and imagination of the user. In industry lasers are used for their intense heat and precision. Solid state lasers have a solid gain medium in which atoms are excited. Wether it is used to produce image or sound, construct a tool, or destroy a star ship the laser will always be a key tool in modern day civilization. The emitted light is monochromatic, meaning only one wavelength, and one directional. A compact disk is a plastic disk with a thin metallic layer. This would require advanced technologies some of which were only in the preliminary stage of research. These lasers are pumped by intense flash lamps in a pulse mode or by a gas laser in a continuous wave mode. Aside from the many uses of lasers that most people will never see, there are endless uses in our every day lives the most common today is the compact disks. Laser light can be used for high density information recording allowing it to record and transmit audio and optical information to a radio or monitor.
Common topics in this essay:
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Albert Einstein,
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Bibliography None,
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