The growth in the power of laser systems makes the problem of protecting photosensitive elements of optical systems and visual organs from high-intensity radiation an urgent issue. This work explores the possibility of optical limitation of quasi-continuous laser radiation using liquid dispersions of conjugates of phthalocyanines and carbon nanotubes. It has been found that the laser beam passes through the studied materials unchanged at low power (< 100 mW), and then begins to expand with the appearance of an interference pattern. The use of a limiting diaphragm makes it possible to block part of the laser radiation, which leads to the attenuation of the laser radiation passed through the “sample-diaphragm” system. This phenomenon can be used to protect light-sensitive elements in optical systems.