The Laser Essay Example For Students

The Laser Essay The LaserBefore we can learn about the laser we need to know a little bit aboutlight (since that is what a laser is made of). Light from our sun, or from anelectric bulb, is called white light. It is really a mixture of all thedifferent colours of light. The colours range from violet, indigo, and blue, togreen, yellow, orange, and red. These make up the visible part of theelectromagnetic spectrum. Light is made up of particles, called PHOTONS, whichtravel in waves. The difference in the colour depends on the wavelength of thelight. Violet light has the shortest wavelength while red has the longest. Thereare other parts of the electromagnetic spectrum which includes infra-red, radar,television radio and micro- waves (past red on the spectrum), and on the otherend of the spectrum are the other invisible radiations, ultra- violet, X rays,micro waves and gamma rays. The wavelength of the light is important to thesubject of the laser. A laser is made up of COHERENT light, a special kind o flight in which the wavelengths of the light are all the same length, and thecrests of these waves are all lined up, or in PHASE. The word Laser is anacronym for Light Amplification by Stimulated Emission of Radiation. What doesthat mean? Basically a laser is a device which produces and then amplifies lightwaves and concentrates them into an intense penetrating beam. We will write a custom essay on The Laser specifically for you for only $16.38 $13.9/page Order now The principles of the laser (and its cousin the maser) were establishedlong before these devices were successfully developed. In 1916 Albert Einsteinproposed stimulated emission, and other fundamental ideas were discussed by V.A. Fabrikant in 1940. These ideas, followed by decades of intensive development ofmicrowave technology set the stage for the first maser (a laser made up ofmicro-waves), and this in turn helped to produce more advances in this area ofscience. These efforts cumulated in July 1960 when Theodore H. Maiman announcedthe generation of a pulse of coherent red light by means of a ruby crystal thefirst laser. Laser light is produced by pumping some form of energy, such as light, froma flash tube (see below) into a LASING material, also known as a medium. Mediacan be liquids, solids, gases, or a mixture of gases, such as the common helium-neon laser (see chart). Each medium produces a laser with a different wavelengthand therefore each medium produces different coloured light. When the energy, inthis case photons (light particles) enter the medium they smash into the atomsof the medium. The atom then releases another photon of a specific wavelength. When a loose photon hits an atom that hasnt emitted its extra photon, bothphotons are released. That is called stimulated emission of radiation. A singleflash from a flash lamp emits billions of pairs of photons into the medium. Thephotons are then released as coherent light. The first laser, a ruby laser, was made up of several main components. Ithad a flash tube coiled around a central rod of synthetic pink ruby. In thiscase the ruby is the medium. A quartz tube was located just underneath the rubyrod. A trigger electrode was connected to the quartz tube. All of this wasenclosed in a polished aluminum casing. This was cooled by a forced air supply. This design was thought to be good enough but later an optical resonatorwas added to redirect light in the right direction which increased laserperformance. The optical resonator was a mirror at one end of the laser toredirect light back into the laser and a partially reflective laser which letssome coherent light through. .u896c2a0c0f04161ef5240f9a5a6cfa1e , .u896c2a0c0f04161ef5240f9a5a6cfa1e .postImageUrl , .u896c2a0c0f04161ef5240f9a5a6cfa1e .centered-text-area { min-height: 80px; position: relative; } .u896c2a0c0f04161ef5240f9a5a6cfa1e , .u896c2a0c0f04161ef5240f9a5a6cfa1e:hover , .u896c2a0c0f04161ef5240f9a5a6cfa1e:visited , .u896c2a0c0f04161ef5240f9a5a6cfa1e:active { border:0!important; } .u896c2a0c0f04161ef5240f9a5a6cfa1e .clearfix:after { content: ""; display: table; clear: both; } .u896c2a0c0f04161ef5240f9a5a6cfa1e { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u896c2a0c0f04161ef5240f9a5a6cfa1e:active , .u896c2a0c0f04161ef5240f9a5a6cfa1e:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u896c2a0c0f04161ef5240f9a5a6cfa1e .centered-text-area { width: 100%; position: relative ; } .u896c2a0c0f04161ef5240f9a5a6cfa1e .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u896c2a0c0f04161ef5240f9a5a6cfa1e .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u896c2a0c0f04161ef5240f9a5a6cfa1e .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u896c2a0c0f04161ef5240f9a5a6cfa1e:hover .ctaButton { background-color: #34495E!important; } .u896c2a0c0f04161ef5240f9a5a6cfa1e .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u896c2a0c0f04161ef5240f9a5a6cfa1e .u896c2a0c0f04161ef5240f9a5a6cfa1e-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u896c2a0c0f04161ef5240f9a5a6cfa1e:after { content: ""; display: block; clear: both; } READ: Electro Magnetic Fields EssayToday there are many types of lasers which include solid state lasers,which have a solid media. The most common of this is a rod of ruby crystals andneodymium-doped glasses and crystals. These offer the highest energy output ofall lasers. Another laser type is the gas laser, which can be made of a pure gasor a mixture of gases or even a vaporized metal in a quartz tube. The helium-neon laser has hight frequency stability and Carbon Dioxide lasers are the mostefficient and powerful continuous wave lasers. The most compact type of laser isthe Semiconductor laser, made from layers of sem i-conducting materials. Sincethese can run by direct applica tion of electrical current these have many uses,such as CD players and laser printers. Liquid lasers

Tips on Finding the Best Scholarships

Tips on Finding the Best ScholarshipsAlthough it is common for people to look for a scholarship that may give them financial assistance, they are not always sure where to get these funds. Therefore, they try to apply for scholarships and grants to get the cash, but not all of them are legitimate. However, there are some scholarships that can give you a big help in getting your education, and these scholarships are called scholarships sample essays. The only way to know which scholarships are legit is to get them from some organizations who have helped others get their scholarships.One way to find out if the scholarship is really genuine is to ask the organizations who give out these scholarships. Some organizations will provide you with the information that you need in order to determine whether or not the scholarship is worth applying for. In other words, you should ask the organization for help.Another way is to search the internet and see which scholarship program you can apply fo r. Some people use this method because they find out about the scholarships through a friend or an acquaintance. Others may want to ask for a particular scholarship through a friend or relative.Scholarship applications are also available through websites such as ScholarshipGuide.com and SoEll.org. All you have to do is type in the information in the form provided by the organizations and they will send you the information.Although you can apply for all types of scholarships, it is still better to apply for the scholarships that are available in your local area. There are specific organizations that are based in your area, so you can apply for the programs that are offered locally. These types of organizations can also provide you with a list of scholarships that are specifically for your geographic area.If you want to get the scholarships from the local community, you can ask for the advice of the office of your local church. These organizations are usually affiliated with the churc h and will provide you with scholarships that are related to your church. You may want to make a request so that you can get more details on the organization that you are planning to apply for.Most people find that applying for scholarships from their local communities is the best way to get the scholarships. However, there are some special ways to apply for the scholarships. For instance, there are organizations that can help you apply for the scholarships.