Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
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Gain coefficient<br />
<br />
<br />
The coefficient () represents the net gain in the photon-flux<br />
density per unit length of the medium.<br />
The photon-flux density therefore is given as<br />
( z)<br />
(0)exp[<br />
( ) z]<br />
<br />
The optical intensity I(z) = h(z)<br />
I( z)<br />
I(0)exp[<br />
( ) z]<br />
<br />
Thus, () also represents the gain in the intensity per unit<br />
length of the medium.<br />
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