Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
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Four-level pumping<br />
<br />
The population difference can be written in the general form<br />
N<br />
N0<br />
1 <br />
s W i<br />
N 0<br />
spN a<br />
W<br />
1 sp<br />
W<br />
s<br />
<br />
sp<br />
1 sp<br />
W<br />
96<br />
96