A with metals. 7. Some other types

A broad range of laser are present and its usage
depends upon the field.  Laser is
categorized in main modules on the basis of medium used to generate laser.
Depending upon the medium the range and wavelength also vary.

Main categories of laser are:

1.      GAS  laser

It is further divided into sub
categories that are:

Helium neon laser:

is a noble gas with wave length is 632.8 nm and preferably used in bar code
scanning and in spectroscopy

Argon laser:

type of laser has wavelengths values 454.6 nm, 514.5 nm, 514.5 nm. It has given
good results in retinal photography. Moreover it is the best for pumping the other

Krypton laser:

wavelengths are between 416nm to 799.3 nm and applied in scientific research
and with the combination of organ it gives white light.

Nitrogen laser:

is 337.1nm of wavelength and source is electrical discharge mostly applicable
in the field of environmental measurement like air pollution measurement.

Carbon dioxide laser:

is 2.6, 4.8 or 8.3 nm long. Used in welding and spectroscopy.

2.      Chemical

Deuterium fluoride laser

maximum wavelength is 4.2 ?m and
its pumping source is chemical reactions and applicable in military areas

Chemical oxygen iodine laser:

is used in military, scientific and material research and of 1.315 ?m .

3.      Dye

Dye laser have broad applications
in medical to remove birthmarks. Use in separation isotopes of atoms. Also used
in medicines and spectroscopy.

4.      Solid
state laser

Ruby laser

main source is flash lamp and have wavelength of 694.3nm. Area of interest is
tattoo removal and holography.

In dental treatment Er:YAG laser is used
with 1.0470and 1.053?m

For the
production of Nano powders a laser known as NdCrYAD is preferable.




5.      Semiconductor

Some people also called it diode
laser and the devices use in this technology is small and consume low power.

6.      Metal
vapors laser

HeCd laser:

or 441.563 nm and used in printing scientific work and enhance flouricnce.

HeHg laser:

mercury laser is useful in construction of amateur laser and scientific areas.

In scientific scenario other important
laser are Helium silver, strontium vapors, neon copper and some other
combination of noble gases with metals.



7.      Some
other types of laser

Free election laser is used in
atmosphere and material science.

Gas dynamic laser has the impact in
heavy industry.

Nuclear pump laser are emitted to apply
in weapons and research.

These are the types of
laser categorized on the basis of medium they also can be grouped in certain
type on the basis of other factors as well like the duration of the emission.

Some laser are emitted
continuously while some are single pulsed. Some laser are repeating in nature
and few of them are mode locked.so on the basis of the duration the have
different ranges of power as well.



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