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Scientists from ITMO University in collaboration with their colleagues from National Taiwan Normal University have developed a high-sensitivity method of studying the non-linear optical properties of substances. Unlike other research in this area, this project uses a collimated (unfocused) laser beam, which allowed the researchers to decrease the power density applied to a sample, though at the price of loss of useful signal. Using a special procedure for recording holograms and processing images, as well as using a special computational modeling algorithm, they have been able to measure the properties of optically non-linear media despite a weak signal. The project opens up new possibilities for diagnostics of non-linear properties. Results of the research were published in Optics Letters.