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Subject: Re: The Differences ...

Date: 05/20/01 at 4:20 PM
Posted by: Marc Ecker
E-mail: MEcker1447@aol.com
Message Posted:

In Reply to: The Differences ... posted by Aria Kamandanu on 05/20/01 at 2:06 AM:


This is a little lenghthy, I apologize: I am
a junior x-ray student who also enjoys
lasers as a hobby. Xrays can be scattered
and have higher energy levels than laser
light, which consists of monochromatic
or polychromatic photons. Xrays tend to be polychromatic (at several wavelenghts) whereas laser light can be either mono or poly.
Xrays are created by collisions of
an incident electron (usually on a rotating
tugsten target) whereas Laser Light is
generated by photo excitation of a solid
state substance(such as a ruby or saphire)
or radio frequency exitation of a gas or
high voltage exitation of a gas. A few
newer ways to make laser light is dpss
(diode pumped solid state) which, when
several diodes are coupled via fiber, is
currently the most widely known efficent
way of generating laser light. Gas lasers
and light pumped lasers are among the
more inefficient. Co2, a gas used for lasing,
is among the most efficent gasses used to
produce laser light. More importantly, xrays
are able to penetrate solid substances without
affecting them, such as passing right through the human body tissue, whereas light energy from lasers only penetrates the initial surface
contact and then burrows a hole through the
substance (based on pulse, time and wattage,
usually measured in joules/sec) Here's a real
clincher- xrays can also be made monochromatic
when they are produced in an x-ray laser. These
devices are extremely dangerous, and I have
had little desire to experiment with them. Perhaps
someday a controlled x-ray laser could be used
to perform a cat scan of the human body.
Xrays exist at the speed of light or they dont exist at all. They collide with electron shells in
various substances producing compton, photoelectric, pair production(annilation reactions), and classical scatter. Light can be bent by a prism or focused by a lens, whereas xrays can only be scattered. There is quite
a bit to this subject, Marc Ecker



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