Lasers

Below is a free term papers summary of the paper "Lasers." If you sign up, you can be reading the rest of this term papers in under two minutes. Registered users should login to view this term paper.

Lasers

When most
people see a laser beam they are amazed by its
unique physical properties. Laser light is so unique
from other light because it is coherent; unlike
ordinary light, which travels in all directions, laser
light travels in a straight beam. The word laser is
an acronym for Light Amplification by Stimulated
Emission of Radiation. The history of the laser is
very interesting. Lasers have changed immensely
since they were first invented. Before the laser was
invented, Charles Townes developed the maser in
1954. The maser has basically the same principles
as the laser, but it involves microwaves instead of
light. The maser lead Theodore Maximan to
assemble the first working laser in 1960; he did
this by applying the masers qualities to light. This
first solid-state laser was a ruby crystal laser. A
year after the first solid-state laser was invented,
the first gas laser was constructed by Ali Javan,
W. R. Bennett, and D. R. Herriot. This was a
helium-neon laser. The helium-neon laser is the
most common laser found today. Many other
types of lasers have been invented since then: the
semiconductor laser (1962), the chemical laser
(1964), the liquid laser (1966), and the free
electron laser (1977). All lasers work basically on
the same principles. First the atoms in the
substance used are pumped. For example, the
helium and neon would be pumped in a
helium-neon laser. This is where the electrons of
the atoms jump to higher orbitals, which have
more energy. The substance can be pumped by
using flashlamps, other lasers, atomic explosions,
electric discharges, solar energy, and etc... When
the atoms are pumped, they perform stimulated
emission. This is where the electrons are
stimulated by photons to release coherent photons
of a single frequency and color. After the pumping
process, the oscillation process takes place. In this
process energy is amplified to make it stronger
and more useful. This is done by bouncing the
photons between two mirrors until they reach a
certain intensity. The two mirrors are one of 100
percent efficiency and one of a lesser efficiency.
When the photons reach the certain intensity, they
leave the mirror of lesser efficiency in a coherent
beam. There are basically four main types of
lasers: solid-state, gas, liquid, and semi-conductor.
Solid-state lasers are made from a crystalline
material such as ruby. The crystals have impurities
in them that can be stimulated to release radiation
in a coherent fashion. These impurities a

This is not the end of the termpaper! Register below to see the complete version of this term paper.

Membership Plans Credit Card Check 1 month membership 3 month membership (You Save 50%) 6 month membership (You Save 67%)

1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22