Abstract
It is well known that two-photon absorption can be greatly enhanced whenever a single photon energy approaches an allowed atomic transition. If more than one intermediate states exist, the two-photon absorption can be annihilated depending on the location of the intermediate states. In case there is only one intermediate state, a control laser can be applied to couple the intermediate state with other state to create two dressed states. Then, the medium can be made transparent against two-photon absorption in the presence of multiple pathways.1
© 1999 Optical Society of America
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