The mysteries of technology. Lasers. By: Garrett Sakomizu. Introduction to the World of Lasers.
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Imagine yourself in a supermarket and you are ready to go pay for your items. You go home and watch a movie in your DVD player. You would have needed a laser for both of those tasks. Lasers are important tool in our everyday lives and is applied to more and more everyday things as technology becomes more and more advanced. In this presentation I have given information on lasers in a couple of ways: science about lasers, the parts of the laser, how a laser works, lasers in our modern world, and lasers in movies and myths.
I hope that you, as the audience will enjoy my presentation.
The word LASER is an acronym for “Light Amplification by Stimulated Emission of Radiation.” Lasers are very unique compared to flashlights as you can see in this picture:
In these pictures, the flashlight’s wavelengths are different because the flashlight emits white light
(which is composed of red, orange, yellow, green, blue, indigo, and violet) which have different
wavelengths. In a laser, the wavelengths are the same, which, in turn, makes a laser one color.
This is why lasers are coherent; they are all one color.
As this presentation has showed you, lasers are powerful beams of coherent light. So, a laser must have something to do with heat or electricity. The diagram below shows the parts of a laser and how they work:
6. Mirrors at
either end bounce
back and forth
7. The mirror
that is not
allows some of
the light to
leave the tube
as a tight beam
of laser light
3. Electrons absorb
the energy from
5. The photon
causing it to
of a photon
Like this presentation has said before, lasers are used all over the place in modern technology. The below photographs show that lasers are used in/for:
Bar Code Scanning Devices
Playing DVD’s and CD’s
Welding (cutting through metal)
An eye treatment such as LASIK
In the last scene of the movie Real Genius Jerry’s
house is destroyed when an overhead plane fires
a powerful laser at an enormous bag of popcorn,
cooking it, and crumpling the house to the ground.
Here is a photograph of that scene:
Lasers have also been used in movies for fighting.
Consider the movies Star Wars and Star Trek. In
Star Wars, lasers are used in lightsabers and
blasters. Here is a photo of a lightsaber:
Lasers have been used in some movies and myths. Here are three examples:
Lasers are also used in Star Trek
vehicles weapons such as in phasers.
The myth is that a strong enough laser can cook so
much popcorn that it can break through windows
and doors and crumple the house to the ground.
I hope you enjoyed my presentation.