Lasers

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Lasers

  1. 1. Lasers By: Ashley Dansby & Rebecca Bryant
  2. 2. Preview or Table of Contents • • • • • Objectives Introductory Laser Acronym How Lasers Work Properties of Laser Light o Monochromatic o Coherent o Directional or Collimated • Advantages in Certain Applications ○ Barcode Scanners ○ Communications ○ Surveying ○ Welding and Cutting ○ Lasik Eye Surgery ○ Medical ○ Medical Disadvantages ○ Dentistry ● Demonstration ● Bibliography
  3. 3. Objectives • • • Describe the Properties of Laser Light Explain how Laser Light has particular advantages in certain applications
  4. 4. Introductory • In this lesson we will be talking about the three properties of laser light and the advantages of laser light in certain situations.
  5. 5. LASER Acronym • Light • Amplification by • Stimulated • Emissions of • Radiation
  6. 6. How Does a Laser Work?
  7. 7. Laser Light Properties 1. Monochromatic 2. Coherent 3. Directional or Collimated
  8. 8. Monochromatic • • • One specific wavelength or one specific color Other light is a combination of many wavelengths or colors.
  9. 9. Coherent • • • • • Organized Photon Emission Laser light is in phase with space and time. Unidirectional - all together Each photon moves in step with the others. All of the photons have wavefronts that launch in unison.
  10. 10. Directional or Collimated • • • • Tight, narrow beam of light in a certain direction from the source. Parallel light waves Other lights come from multiple direction from the source. o Examples: Light Bulbs, Sun
  11. 11. Picture
  12. 12. Bar Code Scanners • • • Supermarkets and stores use lasers to scan the barcode to identify the universal product. The advantage of the laser is that you don’t have to look each individual item up.
  13. 13. Communications • • • A significant advantage of lasers is that it is monochromatic, which allows the pulse shape to be maintained over a large distance. With the better pulse, the communication can be sent at a fast rate without a disruption in the pulses, this is the advantage.
  14. 14. Surveying • • • When surveying an area, a fast laser pulse is sent to a corner reflector at the point to be measured to get the distance. Since the laser is directional and monochromatic, it is an advantage for surveying.
  15. 15. Welding and Cutting • • • On auto assembly lines, a carbon dioxide laser helps with computer controlled welding. Lasers also make the impossible task of welding stainless steel handles to copper cooking pots.
  16. 16. LASIK Eye Surgery • • The Surgery is performed by using a laser, and LASIK surgery correct vision problems.
  17. 17. Medical • • • Lasers are more precise than scalpels. Tissue near an incision is protected, since there is little contact with surrounding skin or other tissue. The heat produced by lasers sterilizes the surgery site, thus reducing the risk of infection. Less operating time may be needed because the precision of the laser allows for a smaller incision.
  18. 18. Medical (cont) • • • • Healing time is often shortened; since laser heat seals blood vessels, there is less bleeding, swelling, or scarring. More procedures may be done on an outpatient basis. Lasers can be used in two ways to treat cancer: by shrinking or destroying a tumor with heat, or by activating a chemical. Lasers may be used with endoscopes, tubes that allow physicians to see into certain areas of the body, such as the bladder.
  19. 19. Medical Disadvantages • • • Relatively few surgeons are trained in laser use. Laser equipment is expensive and bulky compared with the usual surgical tools, such as scalpels. Strict safety precautions must be observed in the operating room. (For example, the surgical team and the patient must use eye protection.)
  20. 20. Dentistry • • • • • Sensitivity Is detected On time Cavities Filling Became Simple Tooth Whitening Less And Sometimes No Blood Loss Effective Treatment Of TMJ dental disorder
  21. 21. Demonstration Plastic Bottle Beam • • • Fill up a plastic water bottle with water and add a sprinkle of cornstarch. Turn down the lights and turn up the laser, aiming the beam through the bottle. Do you see the original beam in the bottle? Can you find the reflection beam and the passthrough beam?
  22. 22. Bibliography • • • • • Wescheler, M. (2000, April 1). How Lasers Work. HowStuffWorks. Retrieved October 28, 2013, from http://science.howstuffworks.com/laser.htm TinyPlanetsBlog. (2010, December 27). TinyPlanetsBlog. Retrieved October 28, 2013, from http://tinyplanetsblog.com/science/two-cool-laserexperiments-you-can-do-with-your-kids Nave, R. (n.d.). Laser Applications. Laser Applications. Retrieved October 28, 2013, from http://hyperphysics.phyastr.gsu.edu/hbase/optmod/lasapp.html Kohler, C. (2013, April 30). Top 5 Major Advantages Of Laser Dentistry. Examiner.com. Retrieved October 28, 2013, from http://www.examiner.com/article/top-5-major-advantages-of-laser-dentistry Harris, W., & Fruedenrich, C. (2000, July 10). How Light Works. HowStuffWorks. Retrieved October 28, 2013, from http://science.howstuffworks.com/light10.htm

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