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Spectroscopie si LASERI. THE LASER SYSTEM

Publicat: 18 Oct 2007 | Vizualizari: 1466

The Laser System
The laser is a system that is similar to an electronic oscillator. An Oscillator is a system that produces oscillations without an external driving mechanism. To demonstrate an oscillator, we can use the familiar acoustic analog.


A sound amplification system has a microphone, amplifier and speaker. When the microphone is placed in front of the speaker, a closed circuit is formed, and a whistle is heard out of the speaker. The whistle is created spontaneously, without any external source.


Explanation: The speaker's internal noise is detected by the microphone, amplified and the amplified signal is again collected by the microphone. This positive feedback continues until a loud whistle is heard.

 
 

Quiz

În acest ”Test” este vorba cât de bine poți gândi. Deoarece unii greșesc la cele mai simple întrebări.Acesta este un așa numit „Test de Logică”.

 
 

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