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When modulated with a radio frequency signal, they will indeed carry information. As in fibre-optic cables. The modulation may be of the several commonly used types, amplitude, frequency, phase ... modulation.
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When do you use laser beams?
Laser light is used whenever it is important that all of the light rays are in phase with each other (when the beam is coherent)Coherence in a light beam helps it travel large distances without spreading significantly. Thus, it is used for laser pointers, so you can point across the room and still make a 3mm dot on the wall.Coherence in the beam also allows information to be retrieved by interferometry. Splitting the laser beam, sending one half to a target and letting the other go straight, then recombining the two can give extremely accurate measurements of distance from the receiver to the target.A variation of this procedure is used to produce holograms.Answer:Lasers are often used in communications since it is possible to send a signal through many miles of glass fiber (over 180 miles) without having signal amplifiers or repeaters. Lasers can also send signals through the air or through space but this is not generally used since laser beams travel in straight lines and cannot follow the curvature of the earth without using a glass fiber. It is also difficult to aim a communications laser accurately at a distant moving target while radio waves illuminate a much larger area. Lasers are also used for cutting, drilling etching and otherwise processing a wide variety of materials including metals and plastics. Lasers can be focused to very fine points allowing small holes or cuts to be made in nearly any material. Lasers are also used in medicine to remove tissue (laser eye surgery) and destroy tattoos or skin blemishes.As mentioned above lasers can be used to precisely measure long distances by splitting the beam and bouncing one portion off a reflector on a distant target then comparing the phase of the returning beam to the reference beam. Interferometry is so successful that the definition of the fundamental distance unit, the meter, is given as wavelengths of light instead of he distance between scratches on a metal bar.Lasers are used by the military to designate spots where a missile can home in to destroy a target or to help aim small arms using laser dot sights. Laser range finding is used to target tank fire as well. Several laser systems are being developed to shoot down missiles, mortar and artillery rounds and working prototypes of some systems exist. However as of 2010 there are no fielded laser weapons that use the laser beam itself to destroy a target.Lasers are also key to information storage in the form of CD, DVD and Bluray technology. The ability to sharply focus the laser is used to read and write small dots on a spinning disc of plastic with metal foil layers.Lasers are also used for performance and entertainment (laser pointers and laser light shows)To summarize lasers are commonly used for communications, data storage, measurement, weapons targeting, machining operations, medical applications and entertainment.
What is a carrier reinsertion oscillator?
A carrier reinsertion oscillator is an electronic circuit used in a radio receiver that is designed to receive single side band carried suppressed radio transmissions. As suggested by the name, in a single side band carried suppressed signal, the carrier signal is suppressed (not transmitted) to save power and/or bandwidth. Before the single side band carried suppressed signal can be decoded to extract the original audio signal, the carrier must first be reinserted. This must be done accurately, otherwise the recovered audio signal will be unintelligible.
Why we use the carrier frequency?
The carrier frequency, as the name implies, "carries" the actual signal to be transmitted. Exactly how this is done depends on the technology being used. At the other end, the receiver subtracts out (don't take that too literally; again, it depends on the technology used) the carrier frequency, and what's left is the desired signal.
Why low pass filters are required in demodulation process?
Demodulation takes place to extract the low-frequency signal from the high-frequency carrier, using a nonlinear process that produces components at the signal frequency. The LP filter is used to eliminate the high-frequency carrier component from the signal so that it does not cause problems at a later stage in the amplification of the signal.
How is magnesium welded with out it being ignited?
Some methods are used: - electron beam welding - laser beam welding - gas wolfram arc welding - gas metal arc welding - resistence welding - brazing
What is a laser modulator used for?
A laser modulator is used to change modulate a beam of light (or laser). The easiest way that they modulate the laser, or light beam, is by changing the rate at which the laser is emitted from the source.
What is caution laser beam?
"Caution Laser Beam" is a phrase used on warning signs and labels to alert users and passersby that a laser beam may be present.
Why. LASER beam is used for carrying out surgery why?
a laser beem is used for carrying out surgery because it
What a laser beam is used in shopping?
The scanner that reads the barcodes uses a laser.
The term laser is a?
The word laser is a noun. It can be used in a sentence such as, "He pointed the laser at the screen when making a presentation." Laser can also be used as an adjective, such as in laser gun or laser beam.
What geometric term is used for a laser beam?
Ray
In Brother Laser printers, are actual laser rays used for printing?
A beam of light is scanned across the printer's photoreceptor. The harmless light beam is what the word laser is referring to.
What would happen if you used the slt beam for a yag laser posterior capsulotomy instead of the yag beam?
what would happen if you used slt laser settings for yag settings for a posterior capsulotomy
What is a lazar used in hospitals?
laser is a beam to cure certain infections.
Laser beam technology is used for?
A laser is a device which produces an intense beam by stimulated emission of photons. This technology is used in repairing detached retinas, barcodes, making holograms and drilling holes in metals.
Could Light be used as carrier for intelligence signal?
Absolutely
What tight beam of light now commonly used in eye surgery?
Laser
