Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
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Gain coefficients<br />
This represents the dependence of the population difference N on<br />
the photon-flux density .<br />
Substituting N into the expression for the gain coefficient,<br />
2<br />
c<br />
( ) N<br />
( ) N<br />
2 2<br />
8n<br />
<br />
sp<br />
gˆ(<br />
)<br />
<br />
We obtain the saturated gain coefficient<br />
() <br />
0<br />
()<br />
1 / s<br />
()<br />
Where the small-signal gain coefficient<br />
c 2<br />
0<br />
() N 0<br />
() N 0<br />
8n 2 2 sp<br />
ĝ()<br />
105<br />
105
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