Lasers

The Laser

Before we can learn about the optical maser we need to kip down a little bit about

swingy (since that is what a laser is make of). Light from our sun, or from an

electric bulb, is c all(prenominal)ed white light. It is really a change of all the different

colours of light. The colours range from violet, indigo, and blue, to green,

yellow, orange, and red. These make up the telescopic part of the

electromagnetic spectrum. Light is made up of particles, called PHOTONS,

which travel in waves. The difference in the colour depends on the

wavelength of the light. Violet light has the shortest wavelength while red has

the longest. There are other part of the electromagnetic spectrum which

includes infra-red, radar, television radio and little- waves (past red on the

spectrum), and on the other end of the spectrum are the other invisible

radiations, ultra- violet, X rays, micro waves and gamma rays. The

wavelength of the light is important to the subject of the laser. A laser is made

up of COHERENT light, a special kind of light in which the wavelengths of

the light are all the same length, and the crests of these waves are all lined up,

or in PHASE. The word Laser is an acronym for Light intricacy by

Stimulated Emission of Radiation. What does that mean?



Basically a laser is a

device which produces and and so amplifies light waves and concentrates them

into an intense penetrating beam.

The principles of the laser (and its cousin the maser) were established

long in advance these devices were successfully developed. In 1916 Albert

Einstein proposed stimulated emission, and other fundamental ideas were

discussed by V.A. Fabrikant in 1940. These ideas, followed by decades of

intensive development of microwave technology great deal the stage for the first

maser...

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