Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
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Three-level pumping<br />
<br />
We can write the population difference in the usual form<br />
N <br />
N 0<br />
1 s<br />
W i<br />
N 0<br />
N a ( sp W 1)<br />
1 sp<br />
W<br />
s<br />
<br />
2 sp<br />
1 sp<br />
W<br />
As in the four-level scheme, N 0 and s saturates as the<br />
pumping transition probability W increases.<br />
102<br />
102