SEM micrographs reveal LIG surface morphology and its variation under different lasing conditions, see Fig. and, testifying to the formation of highly porous structures with a developed surface area for all investigated LIG samples. An ImageJ software package was used to analyze SEM images. The P12% sample shows distinct circular pores, with diameters ranging from 3 to around 20 µm. These pores are the passageways for hot released gases that are produced as by-products during the lasing process of PI foils . The pore size for the P13% sample is similar, yet much less ordered, with high magnification images revealing some kind of powdered features, dissimilar to graphene nanostructures. Their presence may be responsible for decreased electrical conductivity and, supposedly, diminished electrochemical activity of the P13% samples.