I work on optical limiting materials, always face issues in understanding SA and RSA process in more fundamental ways.
Dear Akash Gupta
May be this could give clear insight about your query
https://www.osapublishing.org/josab/abstract.cfm?uri=josab-20-12-2470
Saturable absorption (SA) occurs in NLO materials when its absorption decreases with increasing excitation intensity because of depletion of the ground state (absorption is much faster - typically 10^-16 s - than emission - typically 10^-12 s in fluorescence).
When absorption of the excited state is large compared with the ground state absorption, then absorption increases with increasing excitation intensity (and of course decreases with decreasing excitation intensity); this phenomenon is called reverse saturable absorption (RSA).
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