... glasses or contact lenses are uncomfortable and inconvenient while sailing. In the recent years medical technology has offered a great alternative for people like him, laser surgery. It uses a florescent beam to shave the cornea into a shape that better focuses light. Using local anesthesia the surgeon shaves a thin ... drive without glasses the next day. The surgery is not without risks but the most important, blindness, is virtually nonexistent. More than 1 million laser surgeries have been performed worldwide and none of them has resulted in blindness. The possibility of serious compl...

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... . While they are all dedicated to the same task, reading a bar code, each scanner type offers both advantages and disadvantages, and none is clearly superior in all cases. Hand held laser scanners are the most expensive of the scanning devices, but offer the largest depth of field making them an appropriate choice for a wide variety of non-contact applications. Hand held ... laser scanners use a laser diode to create a scan line by projecting a beam of energy off a rotating prism or oscillating mirror. The beam is reflected out the scanner window onto the bar code, where ... of light is...

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... use, electronic transmission, relaying of television signals, and the need for communication in space all contributed to the emphasis placed on laser technology toward communications. The initial attraction to lasers for communications came from the fact that the amount of coherent information that an electromagnetic ... cornea within, using laser. For example Nearsightedness or myopia occurs when light rays entering the eye are focused in front of the retina instead of directly on it. Myopia is usually a result of the curvature of the cornea being too strong or the length of the eyebal...

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... is therefore equal to 1 joul per second. These units are important in discussing the maximum energy the laser is capable of generating. From the top, if the pulse has the rather long length of one second, energy in the pulse of one joule would be equivalent to a max power of ... one watt. when laser pulses are repetitive, the average power output of a laser(watts) is discussed. This being the product of ... and other applications. Aircraft builders also see the use of lasers systems. Distance and length Co2 lasers are used for optical radar transmitter. Also laser range finders for air...

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... is the job of the tracking system. The tracking system, as it plays the CD, has to continually move the laser outward. As the laser moves outward from the center of the disc, the bumps move past the laser faster -- this happens because the linear, or tangential, speed of the bumps is equal to the radius times the ... speed at which the disc is revolving (rpm). Therefore, as the laser moves outward, the spindle motor must slow the speed of the CD. That way, the bumps travel past the laser at a constant speed, and the data comes off the disc at a constant rate. A CD can store ... more da...

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... be used to make procedures easier to perform and to shorten the length of the procedure and easier on the patient in terms of recovery time. Many private companies are using lasers to correct vision problems. Lasik (laser-In-Situ Keratomileusis) is the most common technique for correcting the near ... for cutting many of the human organs instead of a scalpel because they can make a more precise cut in the tissue around affected area. The laser will not damage the tissue surrounding the cut. Dentists use lasers to burn out diseased parts of teeth. This is a lot quicker and less ... more su...

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... which lasers were thought to have application. Increasing telephone use, electronic transmission, relaying of television signals, and the need for communication in space all contributed to the emphasis placed on laser technology toward communications. The initial attraction to lasers for communications came from the fact that the amount of coherent information that an electromagnetic wave can carry if proportional to its ... Keratomileusis. This literally means, to shape the cornea within, using laser. For example Nearsightedness or myopia occurs when light rays entering the eye are foc...

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... series of pits and flat areas. Reading these pits or flats denote 0's or 1's, the building blocks of binary language which the computer uses. A thin laser beam reads the pits or the flats while the disk is spinning. Light reflects from the flat surfaces, not the pits. So a photo detector reads ... not the only thing that does into creating a usable CD-ROM. Next, the clear disc is given a reflective coating so that it will reflect the laser light the drive shines on it. Silver is used as a basis in this coating because it spreads out evenly, coating all pits and landing uniformly. ... do...

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... fibre, which is used to transmit one signal per fibre. This type is mostly used in telephones and cable TV. It has small cores and transmits infrared laser light. The second type, called multi-mode fibre is used to transmit many signals per fibre and can therefore be used in computer networks and local area ... fibre optics work? A real fibre optic cable is made out of glass that is incredibly pure so that light can still make it through no matter what the length of the cable is. This glass is drawn into a very thin strand and is then coated in two layers of plastic. This coating is done...

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... microscopic bumps lying on a single spiralling track. The track on a CD is 0.5 microns wide and almost 3.5 miles long. The spiral on a CD. To make the laser read the CDs they need to be reflective, this is achieved by adding a layer of aluminium over the disk. To finish the disk a layer of acrylic is sprayed over ... the disk then the label is added. When the CD is read by the laser the disk reflects the beam back, but depending on weather it hits a bump or not the beam will be reflected back in a different direction. If the beam ... . At 2x speed, it would take you about half an hour ...

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... ways. In this paper you will learn about the life of William D. Phillips, and his major achievements. You will learn how they cooled and trapped a laser's atoms, to make it possible to shoot one. William D. Phillips was born November 5th, 1948, in the town of Wilkes-Barre in the state of ... were "commercially"(4) available to own, eventually a few made their way to Phillip's lab. Because of Bills interest in lasers he decided to study the collisions of laser-excited atoms. Excitedly, he wrote up both experiments for his thesis, which he defended in 1976. After his write-ups, he continu...

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... When this happens a small amount of light is created in a quarts tube filled with typically argon gas. The argon gas is what gives a laser its red color in a laser pointer. This tiny sparks makes light, which is in the form of ions. Ions make up all light in the universe. These ions scatter ... to the two sides of the quarts tube. Next the ion enters in an atom of the argon gas, which is the start of the actual laser existence. When the ion enters the atom it picks up a second ion and exits the atom traveling in perfect sink wavelength making an increased strength ... like the second i...

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... is time to burn the CD, also known as to copy onto the CD. When you burn a CD what is actually happening is there is a laser inside of the machine that will copy the music. The laser starts at the beginning of the blank CD and moves at the same pace in a spinning motion around the entire disk until all of the ... tracks are recorded. This laser also known as the "write laser" alters the surface of the CD where as the "read laser" does not. The write laser is much more powerful than the read laser, because it has to alter the disk by "burning", as the write laser does not it only has to ...

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... . The metals that are most often welded are the super alloys, the refractory metals, the reactive metals, and the stainless steels. Many combinations of dissimilar metals can also be welded. Laser Welding: Laser beam welding (LBW) is a welding process which produces coalescence of materials with the heat obtained from the application of a concentrated coherent light beam impinging upon the surfaces to be ... joined. The focused laser beam has the highest energy concentration of any known source of energy. The laser beam is a source of electromagnetic energy or light that can be projected...

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... photography" in which an image is captured not as an image focused on film, but as an interference pattern at the film. Coherent light from a laser is reflected from an object and combined at the film with light from a reference beam. This recorded interference pattern actually contains much more information that a ... the process was essential as movements of the equipment by as much as a quarter of the wavelength of laser light used could completely spoil the image. The image also had to be viewed in laser light. In 1962 a Russian scientist, Dr Uri N. Denisyuk developed a new hologra...

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... transfer bone, tissue, fat and muscle with this procedure. This surgery would be used on a relentlessly disfigured or injured person. There are several different types of flaps used for surgery. Laser surgery is performed on patients who have growths. This type of surgery provides minimal bleeding, bruising and scarring and will diminish the growth ... . Laser surgery can be used on infants with red birthmarks. The laser lightens the birthmark to where it isn't very noticeable. Laser surgery is used with the removal of warts. Here the laser cuts the tissue and seals the blood vessel at o...

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... is called the reference beam. The signal beam is made to reflect off an object and hit a photographic film. Here, it meets the reference beam, which travels directly from the laser. The two beams interfere and a dark and light pattern is produced on the photographic film. Hence, a hologram is created. To display the hologram image, the reference beam is made to ... data stored/read in this form? Holographic computer storage works on a similar principle to the way a hologram is created. The two beams of light are made using a blue-green argon laser. The storage medium in this case is a p...

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... a cylinder. The spherical arm replaces up and down movements along the two axes with a rocking motion of the arm. The spherical arm's work envelope is a partial sphere which has various length radii. The last and most used design is the jointed-arm. The arm has a trunk, shoulder, upper arm, forearm, and wrist. All joints on the arm can rotate, creating six ... nuclear missile attack, hundreds of nuclear battle stations would be put in orbit. When the station detects a missile launch, it move a hollow tube towards the missile. Then the station launches a laser beam that hits the missile ...

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... in the field of solid-state masers for Bell Labs in 1956 after conceiving the idea of the maser in 1951. In 1957 he began working with Arthur Schawlow on a laser project that would operate at wavelengths a thousand times shorter than the maser. He worked with a colleague at the Massachusetts Institute of Technology, Ali Javan, experimenting with some equipment that tested ... invention has made great impact in radar, communications, astronomy, navigation, surgery, atomic clocks and industry. For all his hard work and achievement, Townes received a patent for his invention of the laser i...

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... the music that is played there is House, Techno (most common), breakbeat, Trance, Tribal, and Progressive. The visual effects and a lot at the raves. Most of them use laser shows, others use laser that goes with the beat, and of course the classic strobe light. Then there is another room called the "cool down room" where you can buy water and energy ... ...

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... make power, but the military use it also in weapons. The army also use other inventions like infra-red-photography or the laser technology for their machinations. But these technologies are also need for the civil use. For example with a laser it is able to make fast and efficient surgeries. One of the most important inventions is the computer. He is a part ... ...

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... room and what seems like a wire to go with every inch of your screen. After a few hours of reading directions and connecting all the wires, cables, antennas, and laser beams (okay, maybe not laser beams) you're ready to watch a movie in the comfort of your home at an affordable cost that you can pause, rewind, stop, play, and have amazing theater ... ...

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... to use lasers for surgery. Lasers are based on the physical principle of light, and are devices for the creation and amplification of a narrow, intense beam of coherent light. New laser microsurgery can actually alter the shape of the cornea in the eye so the patient's eyesight can return to normal, and he/she will no longer need those bothersome glasses ... ...

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... to use lasers for surgery. Lasers are based on the physical principle of light, and are devices for the creation and amplification of a narrow, intense beam of coherent light. New laser microsurgery can actually alter the shape of the cornea in the eye so the patient's eyesight can return to normal, and he/she will no longer need those bothersome glasses ... ...

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RHETORIC AND ETHICS The debate that I watched was defiantly something that could touch on an ethical issue. They were proposing a research strategy to make a laser that would be able to shoot missals out of the air if we were to go to war anytime soon. The thing is, is war even ethical? I cannot answer that ... ...

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