What is the difference between to seed an optical amplifier (such as Chirped Pulse Amplifier) and to pump it with a laser source?
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$\begingroup$ What does CPA mean? Or did you mean OPA (optical parametric amplifier)? $\endgroup$– flippiefanusCommented Oct 30, 2022 at 4:17
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$\begingroup$ @flippiefanus CPA stands for Chirped Pulse Amplifier $\endgroup$– SounCommented Oct 30, 2022 at 10:23
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$\begingroup$ Write it out in the question. $\endgroup$– flippiefanusCommented Oct 31, 2022 at 2:49
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The seed is the signal that the amplifier amplifies. To control the output, you control the seed. The pump provides the power to the amplifier.
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$\begingroup$ is it true that the pump creates the population inversion, and then the seed is amplified by stimulated emission? $\endgroup$– SounCommented Oct 31, 2022 at 12:52
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$\begingroup$ @Soun Yes, that's how a laser works. Some seed themselves with spontaneous emission, though. $\endgroup$ Commented Oct 31, 2022 at 13:08