Reverse saturable absorption as a means of passive sensor protection has recently received much attention. It has been known for many years that the optical absorption in certain organic molecules increases with increasing light intensity. For example, reverse saturable absorption was observed in the indanthrone molecule over 22 years ago.1 In contrast, reverse saturable absorption in organometaliic compounds has only received minimal study, because in large part the synthesis and characterization of organometallic compounds is a relatively new field.

© 1989 Optical Society of America

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