About laser physics

  • Thread starter KFC
  • Start date
  • #1
KFC
488
4
What does saturation mean in laser physics? I am reading some material on two-level system, in which it mentions something call "saturating pump field", what does this field mean?
 

Answers and Replies

  • #2
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,579
2,229
In the two-state approximation (ground state and excited state), a pump field can move atoms from the ground state to excited state. When the efficiency of pumping goes to zero (which is reached at a 50-50 population distribution, IIRC), the laser medium is said to be 'saturated'- no additional atoms can be moved into the excited state without some returning to the ground state.

Population inversion (lasing with gain) requires at least three states.
 

Related Threads on About laser physics

Replies
1
Views
3K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
0
Views
2K
Replies
5
Views
4K
Replies
6
Views
2K
Replies
1
Views
1K
  • Last Post
Replies
2
Views
760
  • Last Post
Replies
5
Views
914
Replies
1
Views
923
Top