In recent years, a polarimetric laboratory has been built and operates at the Institute of Physics and Applied Informatics at the Gdańsk University of Technology, allowing the measurement of anisotropic optical parameters of crystals using a method similar to the High-accuracy universal polarimeter (HAUP). More information about the mentioned properties can be obtained by measuring the distribution of the polarization state in 2D. For this purpose, the Applicant also launched an imaging polarimeter, allowing two-dimensional imaging of the state of light polarization in the tested objects. This method enables accurate evaluation of polarizing optical elements, optoelectronic devices and, for example, microbiological tests. Polarization microscopes have a key role in the study of the distribution of the polarization state, allowing the measurement of very small phase differences in birefringent objects. Birefringence and dichroism are good indicators of changes in the structure of the examined object, on a scale much smaller than the wavelength, and even at the level of the shapes of individual molecules. In biological systems, birefringence or dichroism can change rapidly in time and space, mimicking subtle changes in the arrangement of molecules. In the Michael Shribak Laboratory at the Marine Biological Laboratory, a technique was created for collecting and processing polarimetric data obtained using a polarizing microscope for biomedical applications. In 2022, the Applicant's Laboratory at the Gdańsk University of Technology purchased a Nikon Eclipse LV100N Pol polarizing microscope in order to expand the laboratory to study polarization distributions in singular optics elements or microbiological objects. In order to gain appropriate experience and launch a new type of imaging polarimetry research at the Gdańsk University of Technology, Dr. Mykola Shopa applies for financing a research trip for a period of 60 days to the Marine Biological Laboratory in the United States. As part of the trip, the PMP methodology will be used to characterize nonlinear materials (KTP, L-arginine-doped KDP, LBO, KTA and others) in order to provide their optical properties as completely as possible. Typically, the data available in the literature are limited by the refractive index. The principles of the PMP method will complement the HAUP method used by the Applicant, as well as the one proposed in imaging polarimetry.