Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
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Resonant optical susceptibility<br />
<br />
The medium has an absorption coefficient given by<br />
() nc " () res<br />
<br />
( )<br />
"<br />
( )<br />
in the case of normal population distribution when ” res >0,<br />
whereas it has a gain coefficient given by<br />
<br />
nc<br />
In the case of population inversion when ” res