Ultrafast Imaging Breakthrough by East China Normal University

Researchers at East China Normal University, led by Yunhua Yao, have developed a new ultrafast imaging technique called compressed spectral-temporal coherent modulation femtosecond imaging (CST-CMFI). This method captures both the brightness and internal structure of objects in a single measurement, providing unprecedented detail and speed for observing ultrafast phenomena that occur in hundreds of femtoseconds. The technique combines time-spectrum mapping, compressive spectral imaging, and coherent modulation imaging, using a chirped laser pulse and a physics-informed neural network for data reconstruction. It has been successfully used to observe plasma generation in water and carrier dynamics in Zinc selenide (ZnSe), offering insights for laser surgery, medical procedures, and the design of more efficient optical and electronic devices. The research, published by Optica (society) in its journal Optica, is expected to expand applications in interface dynamics and ultrafast phase transitions, with future plans to resolve spectral and temporal information separately to broaden its utility.