Dynamical propagation of nanosecond pulses in Naphthalocyanines and Phthalocyanines

•We study the dynamical processes of nanoseconds lasers in Naphthalocyanines and Phthalocyanines.•We provide theoretical evidences of the main mechanism of optical power limiting.•The central metals play more important roles in the dynamical processes.•The main reason is the central metals enhance the spin-orbit coupling.

Dynamical propagation and optical limiting of nanosecond pulses in peripherally substituted Naphthalocyanines (Npcs) and Phthalocyanines (Pcs) with central metals gallium and indium were theoretically studied using paraxial field and rate equations. The results demonstrated that both Npcs and Pcs have good optical limiting performances, and Npc with heavier central mental indium shows better optical limiting properities due to the stronger reverse saturable absorption, which is mainly strengthened by the larger one-photo absorption cross section of excited state and the faster intersystem crossing rate.

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