... 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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• Grade Level: High School

... 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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... 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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... 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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... fibers experienced excessive optical loss, the loss of the light signal as it traveled the fiber, limiting transmission distances. The development of laser technology was the next important step in the establishment of the industry of fiber optics. Only the laser diode (LD) or its lower-power cousin, the light-emitting diode (LED), had the potential to generate large amounts of light ... 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 developme...

• Word Count: 1457
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• Grade Level: Undergraduate

... 2001) The healing process after the surgery is remarkably wonderful. Most facilitates have rapid healing and a increase in accuracy with each patient. The major advantages of laser surgery is that there's less postoperative discomfort, rapid visual rehabilitation, minimal corneal haze, decrease dependence on postoperative antibiotics and anti-inflammatory medications, and few problems with glare ... surgeon and patient as well as the excellent visual outcomes, rapid recovery, and patient comfort. Choosing the appropriate ophthalmologist is vital in a patient's decision to undergo laser s...

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• Grade Level: Undergraduate

... 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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... . 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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... the clothing of an individual are consistent in characteristics to known hair collected from the suspect and/or victim. Some of these characteristics include more obvious traits such as color, length, and morphological shape and also microscopic aspects of the cuticle, cortex and medulla, which are the three basic components of a hair. A hair cannot be linked specifically to an individual through ... usable fingerprints are present. The labs use classical fingerprint processes such as dusting powders, ninhydrin solutions and "Superglue" techniques. They also use the latest advances in d...

• Word Count: 1267
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• Grade Level: Undergraduate

... 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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... of rapid development fueled the enthusiasm that ushered in even greater discoveries during the 1980s and 1990s. Two techniques developed in the mid 1980's, electrospray ionization (ESI) and matrix assisted laser desorption/ionization (MALDI), have had a significant impact on the capabilities of mass spectrometry. ESI is the production of highly charged droplets that are treated with dry gas or heat to ... into use for biomolecule analysis in the 1980's. MALDI was developed by Tanaka et al. (Japan) as well as by Franz Hillenkamp and Michael Karas, both of Germany. MALDI uses a laser to d...

• Word Count: 2140
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• Grade Level: Undergraduate

... wave helium-neon lazar was developed. Researchers then soon found that rain, haze, clouds, and atmospheric turbulence limited the reliability of long-distance lazar links. By 1965, millimeter-wave and laser telecommunications clearly had major technical barriers to overcome. Millimeter waveguides had to be kept perfectly straight in order to maintain a low loss-of-signal. Optical waveguides were also proving to ... be a problem. Stewart Miller's group at Bell Telephone Laboratories was working on a system of gas lenses to focus laser beams along hollow waveguides for long-distance commu...

• Word Count: 1500
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• Grade Level: Undergraduate

... your buddies live a game of paintball. You are still pumped up on adrenaline, and eager for the next game. One may wonder, what is paintball? Paintball is a sport similar to laser tag but with live ammunition. Players are given a paintball gun, a protective mask, a gas source, and usually some spare paintballs. A paintball gun, also called a marker, uses a pressurized gas source to propel ... ...

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... your buddies live a game of paintball. You are still pumped up on adrenaline, and eager for the next game. One may wonder, what is paintball? Paintball is a sport similar to laser tag but with live ammunition. Players are given a paintball gun, a protective mask, a gas source, and usually some spare paintballs. A paintball gun, also called a marker, uses a pressurized gas source to propel ... ...

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• Grade Level: High School

... violet. The intensity or brightness of the light is defined by the flux. Wavelength in the visible range on the electromagnetic scale, we can attribute a color to it. That is, laser light with a single wavelength of 650 nanometers looks red. The circular wavelength scale outside the color wheel shows the wavelength connection between the linear and circular sequences. The purple region ... ...

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• Grade Level: Undergraduate

... your buddies live a game of paintball. You are still pumped up on adrenaline, and eager for the next game. One may wonder, what is paintball? Paintball is a sport similar to laser tag but with live ammunition. Players are given a paintball gun, a protective mask, a gas source, and usually some spare paintballs. A paintball gun, also called a marker, uses a pressurized gas source to propel ... ...

• Word Count: 2490
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... ) is a chemical compound composed of gallium and arsenic. It is an important semiconductor, and is used to make devices such as microwave frequency integrated circuits, infrared light-emitting diodes and laser diodes. The electronic properties of GaAs are superior to silicon's. It has a higher saturated electron velocity and higher electron mobility, allowing it to function at frequencies in excess of 250 ... ...

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• Grade Level: Undergraduate