Applications of laser
Due to high coherence, high intensity, laser
beams have wide applications in various branches of science and engineering.
The laser beam is used to drill extremely fine
holes in diamonds, hard sheets etc.,
They are also used for cutting thick sheets of
hard metals and welding.
The laser beam is used to vapourize the
unwanted material during the manufacture of electronic circuit on semiconductor
They can be used to test the quality of the
In medicine, micro surgery has become possible
due to narrow angular spread of the laser beam.
It can be used in the treatment of kidney
stone, tumour, in cutting and sealing the small blood vessels in brain surgery
and retina detachment.
The laser beams are used in endoscopy.
It can also be used for the treatment of human
Scientific and Engineering
Since the laser beam can stay on at a single
frequency, it can be modulated to transmit large number of messages at a time
in radio, television and telephone.
The semiconductor laser is the best light
source for optical fiber communication.
Narrow angular spread of the laser beam makes
it a very useful tool for microwave communication. Communication with earth
satellites and in rocketry. Laser is also used in accurate range finders for
detecting the targets.
The earth-moon distance has been measured with
the help of
It is used in laser Raman Spectroscopy.
Laser is also used in holography (three
dimensional lensless photography)
Laser beam can determine precisely the
distance, velocity and direction as well as the size and form of the objects by
means of the reflected signal as in radar.
When an object is photographed by a camera, a two dimensional image
of three dimensional object is obtained. A three dimensional image of an object
can be formed by holography. In ordinary photography, the amplitude of the
light wave is recorded on the photographic film. In holography, both the phase
and amplitude of the light waves are recorded on the film. The resulting
photograph is called hologram.