Lasers


Length: 1130 words (3.2 double-spaced pages)
Rating: Excellent
Open Document
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Text Preview

More ↓

Continue reading...

Open Document


The laser is a device that produces a beam of light. The beam is produced by a process known as stimulated emission, and the word “laser'; is an acronym for the phrase “light amplification by stimulated emission of radiation.'; Lasers amplify light and produce coherent light beams. A light beam is coherent when its waves or photons are in step with one another.
Laser light can be made extremely intense, highly directional, and very pure in color.
BASIC PRINCIPLES
     Light can be characterized both by its frequency, or number of wave crests passing a given point per second, and by its wavelength. Different wavelengths of light are seen as different colors. Like radio waves, light can also carry information. The information in the beam varies in the frequency or shape of the light wave. Because light waves are of much higher
frequencies than radio waves, the have a higher information carrying capacity. In beams of light,individual photon waves are not moving along together because they are not being emitted at the same instant but instead in random short bursts. Such beams are called incoherent.
     The process for laser action, was first proposed by Albert Einstein in 1917. The working principles of lasers were outlined by the American physicists Arthur Leonard Schawlow and Charles Hard Townes in their 1958 patent application. The patent was granted but was later challenged by the American physicist and engineer Gordon Gould. In 1960 the American physicist Theodore Maiman observed the first laser action in solid ruby.
HOW A LASER WORKS
     A laser is made up of several basic components. One is called active medium, which consists of atoms of a gas, molecules in a liquid, ions in a crystal, or any of several other possibilities. Another component consists of some method of introducing energy into the active medium, such as a flash lamp. The third basic component is a pair of mirrors placed on either
side of the active meduim, one of which transmits part of the radiation that strikes it. Atoms initially in a lower state are raised to the upper state by energy from a flash lamp or some other pumping source. Some of these atoms emit light in random directions. Light traveling vertical to the mirrors stays within the active medium long enough to stimulate emission from other
atoms. Light traveling in other directions are soon lost. Some light reaching the output mirror is transmitted to form the laser beam, some is reflected back through the medium to continue the stimulated-emission process.

How to Cite this Page

MLA Citation:
"Lasers." 123HelpMe.com. 19 Aug 2017
    <http://www.123HelpMe.com/view.asp?id=74067>.
Title Length Color Rating  
Lasers And Their Uses Essay - Lasers and Their Uses We have all at some point in our lives used or seen someone use a laser. They are used in compact disc players for stereos or computers, laser surgery, laser printers, holography, cutting and borring metals, communication, bar-code scanners, etc. Over the past three decades' lasers have become a tool used daily by many people and they have become very useful in scientific research. As you can see lasers are a very useful and important tool which is why I have chosen this topic to write about....   [tags: essays research papers] 848 words
(2.4 pages)
Strong Essays [preview]
Essay on Therapeutic Lasers - An increase in technology and efficiency of therapeutic lasers used in veterinary clinics has gained an increasing amount of attention recently. As veterinarians learn more about how they can make this service available to their clients, pet owners seem to be increasingly seeking new alternatives for pet health. What is laser therapy and how does it work. More importantly, is purchasing this technology going to be able to provide the return on investment a practice is hoping for. Laser therapy works by decreasing inflammation, increasing endorphins, and restoring cellular metabolic function....   [tags: technology, veterinary clinics, ]
:: 6 Works Cited
1069 words
(3.1 pages)
Strong Essays [preview]
Essay on How Lasers Work - When first discovered, lasers were thought to be the ‘cure all’ for modern scientific problems. Although many limitations have been realized, lasers are slowly improving many different aspects of our lives. From eye surgery to industrial precision cutting and fabrication to medical marvels like tattoo removal, surgery, and even destroying isolated cancer cells, lasers continue to be a behind-the-scenes tool for improving our lives. Many people have heard of the lasers, but few know that the term is actually an acronym for Light Amplification by the Stimulated Emission of Radiation....   [tags: Physics]
:: 2 Works Cited
1129 words
(3.2 pages)
Strong Essays [preview]
Essay on Solid State Lasers - Solid state lasers, although a 50 year old technology, have remained relevant. However, because of the crystal laser medium there are many considerations specifically inherent to solid state lasers in contrast with gas lasers. In this paper I will discuss the theory of lasers, the basic structure of a solid state laser and contrast some of the solid state components. The theory of lasers The quantum theory of radiation (Einstein, 1917) established conditions in which we could predict the number of excited states of electrons in an atom that could spontaneously emit a photon versus the number of states expected to emit a photon by stimulation....   [tags: Technology, Physics]
:: 9 Works Cited
1630 words
(4.7 pages)
Powerful Essays [preview]
Lasers in Surgery Essay - Lasers in Surgery         Abstract: The laser is gaining increasing popularity in the medical field because of its broad application, efficiency, and improvement in overall ease of the procedures in which it is used.. The laser can treat an enormous range of ailments. The chronic nighttime snorer can give those around him relief by a simple procedure with the laser. In dermatology, the laser can be used for removing moles, tattoos, birthmarks, treating wrinkles, and possibly destroying skin cancer....   [tags: Exploratory Essays Research Papers]
:: 10 Works Cited
1764 words
(5 pages)
Powerful Essays [preview]
Lasers Essay - When most people see a laser beam they are amazed by its unique physical properties. Laser light is so unique from other light because it is coherent; unlike ordinary light, which travels in all directions, laser light travels in a straight beam. The word laser is an acronym for Light Amplification by Stimulated Emission of Radiation. The history of the laser is very interesting. Lasers have changed immensely since they were first invented. Before the laser was invented, Charles Townes developed the maser in 1954....   [tags: essays research papers] 1277 words
(3.6 pages)
Strong Essays [preview]
Lasers Essay - The laser is one of the most advanced tools we have in our civilization. Lasers are powerful enough to cut through a thick piece of steel, yet can be used in medical surgery. Lasers are used in the army, for guns, for range finding and a whole lot more. Most people don't know where the idea of the laser came from. The idea for the laser came from a machine called a maser. The maser was a tool that was able to strengthen, or amplify radio and light waves. The first laser was made in California in 1960....   [tags: essays research papers] 828 words
(2.4 pages)
Strong Essays [preview]
Lasers Essay - The laser is a device that produces a beam of light. The beam is produced by a process known as stimulated emission, and the word &#8220;laser'; is an acronym for the phrase &#8220;light amplification by stimulated emission of radiation.'; Lasers amplify light and produce coherent light beams. A light beam is coherent when its waves or photons are in step with one another. Laser light can be made extremely intense, highly directional, and very pure in color. BASIC PRINCIPLES Light can be characterized both by its frequency, or number of wave crests passing a given point per second, and by its wavelength....   [tags: essays research papers] 1130 words
(3.2 pages)
Strong Essays [preview]
Lasers Essay - lasers The Wonderful World of Lasers Laser stands for Light Amplification by the Stimulated Emission of Radiation. Lasers work by producing an intense beam of bright light that travels in one direction. The laser has the unique ability to produce one specific color or wavelength of light, which can be varied in its intensity and pulse duration. The newest laser systems have become remarkably precise and selective, allowing treatment results and safety levels not previously available. All lasers contain an energized substance that can increase the intensity of light that passes through it....   [tags: essays research papers fc]
:: 2 Works Cited
1215 words
(3.5 pages)
Strong Essays [preview]
Lasers Essay - L A S E R S Did you know that some laser beams are small enough and powerful enough to drill two hundred holes on a spot as tiny as the head of a pin. The first major advancement in laser development came in 1954. This was the year that Charles H. Townes, an American physicist, created a device that amplified microwaves. This device was actually called a maser at first, which was short for Microwave Amplification by Stimulated Emission of Radiation Masers. It produced microwaves of just one frequency....   [tags: essays research papers] 1739 words
(5 pages)
Strong Essays [preview]

Related Searches





HOW LASERS ARE USED
     Lasers have become more and more popular in many different fields. So far there has been no negative side of using lasers when using them correctly. Lasers have become valuable tools in industry, scientific research, communication, medicine, the military and the arts.
Industry
     powerful laser beams can be focused on a small spot with enormous power density. The focused beams can heat melt or vaporize material in a precise manner. Lasers have been used, to drill holes in diamonds, to shape machine tools, to trim microelectronics , to heat treat semiconductor chips, to cut fashion patterns, to synthesize new material. The powerful short laser pulse also makes possible high-speed photography with an exposure time ofseveral
trillionths of a second. Lasers have been used by car manufacturers to measure wind speed to test the wind resistance of a new car design. A laser beam provides a straight line over a very long distance to help guide engineers when they are digging tunnels. Laser beams were used for alignment in the construction of the Bay Area Rapid Transit system in San Francisco.
Scientific Research
     Lasers are used for monitoring crustal movements and for geological surveys. They are also the most effective detectors of certain types of air pollution. Lasers have been used for precise determination of the earth -moon distance and in tests of relativity. With lasers, the speed of light has been determined accurately, chemical reactions can be selectively induced,
and the existence of trace substances in samples can be detected in chemical analysis and photochemistry. The most powerful lasers in the world are used to explore the structures of atoms. Lasers help scientists make very accurate measurements. Lasers can pierce clouds and send back messages that help scientist determine cycles of weather. Laser beams measure small
movements of the earth&#8217;s surface on a volcano in California, it helps scientists to tell when the volcano will erupt.
Communication
     Laser light can travel a large distance in outer space with little reduction in signal strength. Because of its high frequency, laser light can carry 1000 times the television channels than is carried today by microwaves. Lasers are ideal for space communications. Optical fibers have been developed to transmit laser light for earthbound communication in telephone and
computer systems. Lasers are also used to play audio compact disks and videodiscs. Laser printers are used all over the world and our communication system has been revolutionized by the ability of lasers to carry out messages over networks. In offices lasers were put into a fax machine. Offices are miles apart and these lasers send information through the fax machine to
the other offices. Cable wire is used in almost all communication hardware and researchers have found out that no matter how twisted and curled a cable wire might be the laser light always shines out to the other end.
Medicine
     Intense, narrow beams of laser light can cut certain tissues in a small fraction of a second without damaging the surrounding healthy tissues. They have been used to &#8220;weld'; the retina, bore holes in the skull, vaporize lesions, and clear blood vessels. When arteries are clogged the blood is not flowing through freely. A thin fiber is inserted into the blood vessel to give the
doctor a clear view of what he has to do. A small camera takes pictures of the artery. Then the instrument directing the laser is inserted through the incision and this beam of light concentrated through the thickness of the artery and it is able to cut a clean line all around the hardened
matter, instantly vaporizing the plaque. A laser in eye surgery could be used to spot-weld a detached retina. Today lasers make it easier to perform surgical operations that once were considered too dangerous. Dentists also use the red aiming beam of a laser in vaporizing the decayed area of a tooth. The endless uses of lasers in all kinds of medicine is unimaginable.
Military
Laser guidance systems for missiles, aircraft, and satellites are being studied and constructed. Lasers are also used by soldiers, laser guns are used to determine distance to a target accurately. In 1983 President Ronald Reagan urged the use of laser beams in the defense system against hostile missiles.


Return to 123HelpMe.com