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LASERS

 

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LASER   or light amplification by stimulated

emission of radiation is a device which  produces an intense beam of monochromatic light. •

LASER   emits light through a process called stimulated emission of radiation which amplifies or increases the intensity of light.

 

ABBREVIATION OF LASER 

L- Light A- Amplification by S- stimulated E- emission of  R- radiation

 

CHARACTERISTIC OF LASERS •

Monochromatic; this means the laser beam is made of a single colour or a single wave length. In contrast ordinary white light bulb is a combination of many colour or wave length and is certainly not monochromatic

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Coherence; means the wave length of the laser light is in phase, in space and time this is because of the orderly electronic transition that take place in the laser. So, in contrary the light emitted from an ordinary light source is incoherent because the radiation emitted from different atoms has no defined phase relationship with each other.

 

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Directional; which the laser are relatively narrow means beam light in a emitted specific by direction without dispersion.a Moreover, the laser beam spread very little and thus can be focused sharply and if you observe ordinary bulb light it emits light in all directions.

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High intensity; in laser, the light spreads in small region of space and in a small wavelength range. Hence, laser light has greater intensity when compared to the ordinary light.

 

Applications of the laser beam 1. Bar code code scann scanners ers 2. Intrud Intruder er detection detection in high security areas e.g. golds golds  banks, museums especially valuable artificers. artificers. 3. Laser point pointer er and printer printerss 4. Opt Optica icall tweezers tweezers 5. For cutting cutting high strength strength material material like steel.

 

Figure of RUBY laser 

 

TYPES OF LASER    

Fiber laser  Ruby laser  Helium-neon laser 

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 Nitrogen

 

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