Lasers

Lasers

Raphael Radon
Mr.Cruz
Physics honors



Through out the past few years lasers have been going through many
innovations thus having a tremendous impact on technology . What is a laser? A laser is a special kind of light .The initials stand for ( L-A-S-E-R light amplification by stimulated emission of radiation)Only the light that is commonly know to us is the type that spreads out . Laser light is in a straight beam. There are many types of lasers , some make holograms , some have special features like long coherence length or an output beam in different color (blue green ..) and helium neon lasers .Lasers serve for many purposes they can trigger thermonuclear explosions , telephone communication , photography ,printing (computers and laser printers ) drill through diamond , detect the measure of electrons , art and music , eye surgery , and fun games like laser tag .

The first person to come up with the concept of light was Albert Einstein. In 1917 he developed a theory that a special kind of light could be made , under the right conditions the light wouldn’t scatter unlike normal light, and it would be very intense. Nearly 45 years latter scientists came up with the first laser . The reason no one figured out how to make the lasers is because they lacked the basic concept and theory . " Atoms always tend to be at their ground state . When they are stimulated , they remain at an excited state for only a split second. The chances for a photon with the same energy level striking an excited electron are very small. Therefore we never see laser light in nature ."

Lasers come in different types , the first is called Optically Pumped laser   .The inventor of this laser is Theodore Maiman . In this laser atoms of a solid material crystal or glass are excited by bursts of light .In this laser   is made of a rod with mirrors at the end to make the light bounce back and forth. The second laser is a Liquid Laser this laser eliminates the need for rods by...