What Causes Saturated Absorption in Materials?

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Can anyone briefly explain that what is saturated absorption? What's the condition to have saturated absorption?
 
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I've never heard the term before, but I suspect it means a process where a 50-50 distribution has already been reached (by this I mean that both states involved in the process are equally populated), meaning the system can not absorb more energy.

This is also known as "Hole burning" in optics.
 

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