Phthalocyanines as active materials for optical limiting

This work gives an overview concerning the optical limiting processes in ph thalocyanines. In particular, the synthesis and the relevant optical proper ties of a series of axially substituted indium(III)- and titanium(IV)-phtha lo- and -naphthalo- cyanines are described. Several techniques, such as tra nsient absorption, Z-scan, and degenerate four-wave mixing, have been used for assessing the optical properties and optical limiting performance of th e investigated compounds.