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NET 436 optical Network

NET 436 optical Network. Lab 6. Laser. A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

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NET 436 optical Network

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  1. NET 436optical Network Lab 6 Networks and Communication Department

  2. Laser • A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. • The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".

  3. Design • A laser consists of a gain medium, a mechanism to energize it, and something to provide optical feedback.The gain medium is a material with properties that allow it to amplify light by way of stimulated emission. Light of a specific wavelength that passes through the gain medium is amplified (increases in power). • For the gain medium to amplify light, it needs to be supplied with energy in a process called pumping. The energy is typically supplied as an electrical current or as light at a different wavelength. Pump light may be provided by a flash lamp or by another laser. • The most common type of laser uses feedback from an optical cavity—a pair of mirrors on either end of the gain medium. Light bounces back and forth between the mirrors, passing through the gain medium and being amplified each time. Typically one of the two mirrors, the output coupler, is partially transparent. Some of the light escapes through this mirror. Depending on the design of the cavity (whether the mirrors are flat or curved), the light coming out of the laser may spread out or form a narrow beam. In analogy to electronic oscillators, this device is sometimes called a laser oscillator. Networks and Communication Department

  4. Components of a typical laser: 1. Gain medium 2. Laser pumping energy 3. High reflector 4. Output coupler 5. Laser beam Networks and Communication Department

  5. Uses • When lasers were invented in 1960, they were called "a solution looking for a problem". The lasers are uses in applications in every section of modern society, including consumer electronics, information technology, science, medicine, industry, law enforcement, entertainment, and the military. Fiber-optic communication using lasers is a key technology in modern communications, allowing services such as the Internet. • The first use of lasers in the daily lives of the general population was the supermarket barcode scanner, introduced in 1974. Networks and Communication Department

  6. Uses Some other uses are: • Medicine: Bloodless surgery, eye treatment • Industry: Cutting, welding, material heat treatment, marking parts • Military: Marking targets • Law enforcement: used for latent fingerprint detection in the forensic identification field • Product development/commercial: laser printers, optical discs (e.g. CDs and the like), barcode scanners • Laser lighting displays Networks and Communication Department

  7. Examples by power Networks and Communication Department

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