Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
Lecture 8: Laser amplifiers
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Rate equations in the presence of amplifier radiation<br />
<br />
<br />
The presence of radiation near the resonance frequency 0 enables<br />
transitions between levels 2 and 1 to occur via stimulated emission and<br />
absorption.<br />
These processes are characterized by the probability density<br />
W i = ()<br />
where = I/h (assuming g 1 = g 2 and thus e () = a ())<br />
R 2<br />
2<br />
W<br />
-1<br />
i<br />
1<br />
R 1<br />
sp<br />
nr<br />
1<br />
20<br />
88<br />
88