Abstract: The present invention concerns a solid transparent OPL-material, (OPL; Optical Power Limiting). It comprises a solid polymer material that constitutes a matrix with therein dispersed particles. The particles are either nickel-ferrite(NiFe2O4), carbon black (C) or fullerene (C60)—The diameter of the particles is preferably in the sizes about 5-50% of the wavelength of the laser light that protection against is wanted. Those polymers as matrix materials yield OPL materials that both reveal good OPL-properties and good durability and stability during exposure to laser light irradiation of high intensity together with the said particles.