Preview or Table of
How Lasers Work
Properties of Laser
o Directional or
Advantages in Certain
○ Barcode Scanners
○ Welding and Cutting
○ Lasik Eye Surgery
○ Medical Disadvantages
Describe the Properties of Laser Light
Explain how Laser Light has particular
advantages in certain applications
In this lesson we will be talking about the
three properties of laser light and the
advantages of laser light in certain
• Amplification by
• Emissions of
One specific wavelength or one specific color
Other light is a combination of many
wavelengths or colors.
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
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
o Examples: Light Bulbs, Sun
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.
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.
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
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
LASIK Eye Surgery
The Surgery is performed by using a laser, and
LASIK surgery correct vision problems.
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
Healing time is often shortened; since laser heat seals
blood vessels, there is less bleeding, swelling, or
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
Relatively few surgeons are trained in laser use.
Laser equipment is expensive and bulky
compared with the usual surgical tools, such as
Strict safety precautions must be observed in
the operating room. (For example, the surgical
team and the patient must use eye protection.)
Sensitivity Is detected On time
Cavities Filling Became Simple
Less And Sometimes No Blood Loss
Effective Treatment Of TMJ dental disorder
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
Do you see the original beam in the bottle?
Can you find the reflection beam and the passthrough beam?
Wescheler, M. (2000, April 1). How Lasers Work. HowStuffWorks.
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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
Harris, W., & Fruedenrich, C. (2000, July 10). How Light Works.
HowStuffWorks. Retrieved October 28, 2013, from