Search by tag «Nonlinear optics» 2 results

  • ITMO Scientists Make First-Ever Measurement of Nonlinearity in Terahertz Frequency Range

    Researchers from ITMO University have, for the first time in history, managed to directly measure the nonlinear refractive index of matter in the terahertz range. The results of their experiments were compared with previously existing theoretical predictions in order to confirm the presence of nonlinear effects. The obtained data can be used to control light, as well as in fundamental and biomedical research. The results have been published in Optics Express.


  • Scientists Develop New Analysis Method of Non-Linear Optical Properties

    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.