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Back to Square One
Back to Square One Terry Dashner………………Faith Fellowship Church PO Box 1586 Broken Arrow, OK 74013 We’ve come full circle. We’re back to square one. It has been a long journey filled with theologians, philosophers, scientists, and even atheists....
CAUTION! QURA'AN IS NOT JUST A BOOK .....READ TO LEARN THE MIRACLES OF QURA'AN part3
THE FUNCTION OF MOUNTAINS The Qur'an draws attention to a very important geological function of mountains. We placed firmly embedded mountains on the earth, so it would not move under them… (The Qur'an, 21:31) As we have noticed, it is stated in the...
Excerpts from THE ENCHANTED SELF, A Positive Therapy
In my years as a psychologist, I have come to believe that most people seeking psychotherapy are unhappy not only because of earlier hurts and traumas, as well as present frustrations and problems, but because they cannot access earlier happy...
Superultramodern Science (SS) and The Millennium Problems in Mathematics
In this article I address 3 of the 7 millennium problems in mathematics announced by the Clay Mathematics Institute (CMI), USA. I propose solutions (not all of which are meant to be conclusive) to the problems using the ideas in Superultramodern...
The How TO of Pyramids
GEOPOLYMERIZATION: I just watched a show dealing with the Incan Andean cosmology that said they believed in 'As Above, So Below'. This is one of the three laws of the Magi and the Dictum of Hermes that our secret agent of British Intelligence has...
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Lasers - The New Mythical Gift Of Fire
Copyright 2005 by Doug Smith
In Greek mythology, the Titan Prometheus gave the gift of fire
to Humanity. It provided warmth, light, and energy. Whether
or not you believe that myth, humanity has learned to
concentrate that light into beams of unimaginable power:
Lasers.
What does that word make you think of first? Science fiction
ray guns? A secret agent strapped to a table while a metal-
melting beam of light inches toward him? Or maybe the master
thief throwing dust in the air to reveal a deadly maze of red
laser beams guarding the treasure?
Those are all popular but outdated images of the laser. Today,
lasers vanquish different foes such as unwanted hair, vision
correction, and even tumors.
How is a beam of light able to delicately reshape the surface
of the eye, yet still be able to cut steel?
LASER is an acronym for "Light Amplification by Stimulated
Emission of Radiation." In this definition radiation doesn't
refer to nuclear radiation, but to electromagnetic radiation.
The electromagnetic spectrum includes radio waves, microwaves,
infrared light, visible light, ultraviolet radiation, and X-rays.
Some light wavelengths are visible, and other are not unless
special equipment is used (e.g., infrared cameras, night-vision
goggles).
Lasers operate by concentrating the strength of various forms
of light. The strengthened beam is an almost perfectly straight
beam, called a coherent beam. "Coherent" means that almost all
of the light energy (photons) are traveling in the same direction.
The laser light energy stays focused on a smaller area with
greater power.
Compare this to an incoherent light source such as a light bulb,
which emits photons in many directions and at many wavelengths.
This is the job of a bulb, because we want visible energy spread
out as much as possible.
A
flashlight also uses a light bulb, but also contains a curved
mirror to approximate a more coherent beam. The light from the
strongest commercial spotlight (essentially a giant flashlight)
will disperse in the atmosphere after a relatively short distance.
A laser beam can be bounced off the moon!
A closer analogy to a laser is a magnifying glass. Remember as
a child how you got the sun's rays to focus on a tiny spot that
got hot enough to burn? That's similar to what a laser does,
unless you moved the magnifying glass. Then the focus was lost
and the sunlight was no longer concentrated. Because the laser
employs a coherent beam, that essentially means it stays focused
no matter the distance! Think of it link an infinite magnifying
glass.
Lasers can perform a multitude of different tasks at different
power levels. Specific light wavelengths and beam strengths
can be achieved by altering the light source, power source,
and even the color of the light. This extreme versatility
allows both the shaping of a delicate cornea and the cutting
of industrial steel.
The laser in your CD player won't cut steel, but neither
can the industrial laser reshape your eye without destroying
it. Matching the right laser power to the right job enables
us to safely harness this useful new fire.
This article may be freely copied and published as long as
no content is changed except line length to fit your
publication. The author's hyperlinks must remain active
and clickable, or be made active.
About the Author
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