Gas lasers
Gas laser - a
laser in which the active medium is a gas containing a laser active species.
It is typically composed of a plasma discharge tube containing a gas that
can be excited with an electric discharge.
Helium Neon
lasers
Illuminated Neon signs
are common and you would be right to assume therefore that it is the Neon
gas in the laser that produces the light output. The addition of the Helium
to the Neon gas increases the effectiveness of the laser by efficiently
absorbing the energy of the electrons. A few thousand volts discharge
is used, with a current of 10-20 milliamps.
The efficiency of a
HeNe lasers is very low (< 1%) but as they are commonly used only in
low power applications (several Milliwatts of energy) they can be cooled
effectively by air.
Gas Ion lasers
Neon belongs to the
inert group of elements known as the Noble gases. Other members of this
group include Argon and Krypton. As with all gas lasers these can be ionised
by a discharge of high energy electrons. These lasers need higher currents
and so the laser design is more complicated. They are also water-cooled
due to the large amount of waste heat generated.
A 200 Volt discharge
is used, with a current of 15-50 Amps. Several Watts of energy can be
produced for a continuous beam.
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Carbon Dioxide lasers
The vibrational and
rotational modes of the gas molecules is used, and infra-red microwave
radiation is thus produced.
Upto 30 % efficiency
can be achieved and it is easy to produce a beam of 100 Watts of energy.
Using laser tubes tens of metres in length enable many kilowatts of energy
to be produced.
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