lasers
TRANSCRIPT
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LasersBy: Ashley Dansby & Rebecca Bryant
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Preview or Table of Contents
• Objectives• Introductory• Laser Acronym• How Lasers Work• Properties of Laser
Lighto Monochromatico Coherento Directional or
Collimated
• Advantages in Certain Applications○ Barcode Scanners○ Communications○ Surveying○ Welding and Cutting○ Lasik Eye Surgery○ Medical○ Medical Disadvantages○ Dentistry
● Demonstration● Bibliography
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Objectives
• Describe the Properties of Laser Light
• Explain how Laser Light has particular advantages in certain applications
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Introductory
• In this lesson we will be talking about the three properties of laser light and the advantages of laser light in certain situations.
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LASER Acronym
• Light• Amplification by• Stimulated • Emissions of• Radiation
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How Does a Laser Work?
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Laser Light Properties
1. Monochromatic
2. Coherent
3. Directional or Collimated
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Monochromatic
• One specific wavelength or one specific color
• Other light is a combination of many wavelengths or colors.
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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.
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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
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Picture
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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.
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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.
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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.
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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.
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LASIK Eye Surgery
• The Surgery is performed by using a laser, and LASIK surgery correct vision problems.
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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.
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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.
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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.)
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Dentistry
• Sensitivity Is detected On time
• Cavities Filling Became Simple
• Tooth Whitening
• Less And Sometimes No Blood Loss
• Effective Treatment Of TMJ dental disorder
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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 pass-
through beam?
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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-laser-experiments-you-can-do-with-your-kids
• Nave, R. (n.d.). Laser Applications. Laser Applications. Retrieved October 28, 2013, from http://hyperphysics.phy-astr.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