Lasers And Their Uses :: essays research papers

Lasers and Their Uses     We restrain alone at some point in our lives utilize or seen someone use a laser.They are used in compact disc players for stereos or computers, laser surgery,laser printers, holography, shimmy and borring metals, communication, bar-codes locoweedners, etc. Over the past three decades lasers have become a lance useddaily by many people and they have become very useful in scientific research.As you can see lasers are a very useful and important tool which is why I havechosen this topic to write about.     The stipulation laser is an acronym. It stands for "light amplification bystimulated emission of actinotherapy". They produce a narrow, intense beam of crystalline light.     In a laser the atoms or molecules of a crystal, like ruby or garnet-orof a gas, liquid, or other substance-are hallucinating so that more of them are athigher nada levels than are at lower might levels. If a photon whosefrequency corresponds to the energy difference between the excited and groundstates strikes an excited atom, the atom is stimulated, as it falls back to alower energy state, to emit a second photon of the same frequency, in phasewith and in the same direction as the bombarding photon. This process iscalled stimulated emission. The bombarding photon of the emitted photon may wherefore strike other excited atoms, stimulating further emission of photons, allof the same frequency and phase. This process produces a sudden burst ofcoherent radiation as all the atoms venting in a fast chain reaction. Thelight beam produces is usually pencil thin and maintains its size and directionover very long distances.     Lasers vary greatly in the way they look and what they are used for.Some lasers are as large as buildings while others can be the size of a grainof salt.     There are many parts to lasers. I impart now explain what they are and their uses.1) Pumping systemsThe pumping system is used to transmit energy to the atoms or moleculesof the medium used in the laser.a. optical pumping systems uses photons provided by a beginning such as a Xenongas winkle out lamp or another laser to transportation system energy to the lasing material. Theoptical source must provide photons which correspond to the allowed transmutationlevels of the lasing material.b. collision pumping relies on the transfer of energy to the lasing material bycollision with the atoms or molecules of the lasing material. Again, energieswhich correspond to the allowed transition must be provided. Thisoften done by electrical discharge in a pure gas - or gas compartmentalisation - in a tube.