Coherence, Physics

COHERENCE :

1) Visible light energy is emitted when the excited electrons in atoms undergo transitions to the ground state.

2) In ordinary light sources, these transitions take place at random in time and the light waves received at a point on a screen bear no definite phase relation among them.

3) But, in a laser source, electronic transitions take place in an 'orderly way' and the light waves emitted have a consistent phase relation which does not change with time.

4) This is called 'temporal coherence' and is the most important characteristic of laser light.

 

Posted Date: 10/18/2012 8:57:03 AM | Location : United States







Related Discussions:- Coherence, Assignment Help, Ask Question on Coherence, Get Answer, Expert's Help, Coherence Discussions

Write discussion on Coherence
Your posts are moderated
Related Questions
Coulomb; C (after C. de Coulomb, 1736-1806) The derived SI unit of electric charge, described as the amount of charge transferred through a current of 1 A within a period of 1

In p-type semiconductor the majority carriers are (A) Holes. (B) Positive ions. (c) Electrons. (D) Negative ions. Ans: In p-type semiconductor the majori

utmost Velocities in a Quarter Mile To verify the maximum speed possible for a wheel driven vehicle we will suppose that the coefficient of friction between the tires and the g

two insulated charged copper spheres A and B of identical size have charge q and -3q respectably .when they are brought in contact with each other and then separated,what are the n



Does weight affect how far you jump? For the same leg strength / jumping method, weight affects how far one can jump. Acceleration = Force / Mass With more mass, you can

Potential free contacts (also known as "dry contacts") are simply contacts which are physically operated with the main device, but not electrically connected to it. For example a m

How do you make a model of a free body diagram for a science project?