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lasers in engineering

Unlike conventional bulbs, which have no mid-energy state(Metastable state). They go from their ground state to the excited state and back again to ground state. The energy released from this is given out as light and not reflected back to the source in anyway. .
             Free radiating waves issued from an atom which have been stimulated to emit radiation are reflected back using reflected surfaces. Light wave-energy is thus reflected back to the source stimulating more atoms into emitting more special radiation.
             Maiman's laser with a rod of ruby, the rod is fashioned from any type of gem stone, the bulk of rod acts merely as the host material. E.g. Ruby, the active material in this case being chromium ions. Ruby composition Cr3+:Al2 O3. when the material corundum possesses no chromium, its sapphire.
             The Ruby laser is classed as a crystalline solid laser because the host is a grown crystal of ruby. Quite an important laser is one using neodymium ions as active ions and non-crystalline(amorphous) glass as the best material. Use of glass bypasses the cumbersome crystal growing thus higher peak power.
             There are also gas lasers, a gas tube filled with a special gas mixture. High voltage applied across two electrodes near the ends cause electrical discharge and thus the gas glows.
             The difference between gas and ruby lasers is that most gas lasers operate continuously. The glow discharge applied by the voltage continually places a large population of atoms in the metastable state, although atoms falling back to a lower level are elevated back up again by the glow-discharge phenomenon.
             There are also semiconductor-lasers. Semiconductor materials are neither good conductors of electricity nor perfect insulators. Direct current flows through material by connecting power source to electrodes affixed to opposite surfaces, atoms within the material are therefore excited to a higher energy state, falling back to a lower state gives off light or other types of electromagnetic radiation.


Essays Related to lasers in engineering

1. Engineering

The study of engineering started many years ago. ... (Parsons, Engineers and Engineering in the Renaissance, 176). ... The history of engineering is the record of human ingenuity (Kirby, Engineering in History, 42) May fields of engineering have developed since the 1750's. ... Some scientific and technological breakthroughs have been artificial hearts, airplanes, computers, lasers, nuclear energy, plastics, space travel, and television. ... They should be willing to work within deadlines for completing projects (McHugh, Careers in Engineering and Engineering Technology, 79). ...

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2. Technology and Chemical Engineering

"They combine the science of chemistry with the discipline of engineering in order to manufacture materials and products essential to society.... Also, in 1887 a series of lectures grew interest in chemical engineering. Over the years the idea of the a branch of engineering concerned with the design and operation of industrial chemical plants continued to be that "an idea". ... You will also need a strong background in process design, production engineering, research and development, safety, marketing sales, and environmental waste management. ... Jay Olshansky perfectly sums t...

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3. Issues in the Field of Mechanical Engineering

Mechanical engineering is one of the largest and oldest fields in the engineering field. Mechanics, mathematics, engineering sciences, design manufacturing, etc. form the foundation of mechanical engineering. ... For example, laser glasses for areas where lasers are used , Safety glasses to prevent chemical liquids or acids from getting in your eyes, earplugs to protect your ears from loud noises , Hard hats for extra protection , and steel-toe boots to protect your feet from any object that can pierce the sole of your shoe. ... Engineering work usually varies from week to week. ... Overall, m...

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4. Human Genome Project

Lasers are used in the detection of DNA in many aspects of the project; a very important use is in sorting chromosomes by flow cytometry. Lasers are also used in confocal fluorescence laser microscopy to excite fluorescently tagged molecules in genome mapping, in addition to other mapping uses. In diagnostic applications, lasers are used with fluorescent probes attached to DNA to light up chromosomes and to create patterns on DNA chips. ... Genetic engineering seems in this respect to offer the brightest hope for parents. ... One significant element is the assertion that genetic engineerin...

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5. The Human Genome

Lasers are used in the detection of DNA in many aspects of the project; a very important use is in sorting chromosomes by flow cytometry. Lasers are also used in confocal fluorescence laser microscopy to excite fluorescently tagged molecules in genome mapping, in addition to other mapping uses. In diagnostic applications, lasers are used with fluorescent probes attached to DNA to light up chromosomes and to create patterns on DNA chips. ... Genetic engineering seems in this respect to offer the brightest hope for parents. ... One significant element is the assertion that genetic engineering ...

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6. Human Genome Project

Lasers are used in the detection of DNA in many aspects of the project; a very important use is in sorting chromosomes by flow cytometry. Lasers are also used in confocal fluorescence laser microscopy to excite fluorescently tagged molecules in genome mapping, in addition to other mapping uses. In diagnostic applications, lasers are used with fluorescent probes attached to DNA to light up chromosomes and to create patterns on DNA chips. ... Genetic engineering seems in this respect to offer the brightest hope for parents. ... One significant element is the assertion that genetic engineering ...

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7. Fiber Optics

In 1957, Gordon Gould popularized the idea of using lasers when, as a graduate student at Columbia University, he described the laser as an intense light source. Shortly after, Charles Townes and Arthur Schawlow at Bell Laboratories supported the laser in scientific circles. Lasers went through several generations including the development of the ruby laser and the helium-neon laser in 1960. Semiconductor lasers were first realized in 1962; these lasers are the type most widely used in fiber optics today. ... The Avocent Digital Desktops (formerly 2C Computing) engineering, support, market...

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8. Nanofiber

The synthesis of nano structure was also accomplished by combining thermal evaporation of SiO powders and laser ablation of Ge target. ... Laser-supported, dipole-assisted self-assembly results in blue-light guiding nanostructures, namely single-crystalline nanofibers of hexaphenyl molecules. ... Fabrication of region below 100 nm can't be done by simple engineering extensions of conventional photolithography, although sophisticated enhancement may play a big role. ...

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9. Nanofiber

The synthesis of nano structure was also accomplished by combining thermal evaporation of SiO powders and laser ablation of Ge target. ... Laser-supported, dipole-assisted self-assembly results in blue-light guiding nanostructures, namely single-crystalline nanofibers of hexaphenyl molecules. ... Fabrication of region below 100 nm can't be done by simple engineering extensions of conventional photolithography, although sophisticated enhancement may play a big role. ...

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