Femtosecond Laser-Acoustic Modeling and Simulation for AlCu Nanofilm Nondestructive Testing

In the field of nondestructive testing, photoacoustic detection has shown excellent performance in measuring the thickness and detecting defects of metal nanofilms, which are crucial components in electronics, optics, and material science. Ultrafast lasers, with their extremely short pulse durations, have revolutionized material processing and measurement, enabling high temporal and spatial resolution analysis of materials. However, existing research on ultrafast lasers mainly focuses on picosecond or nanosecond lasers for large-scale material processing and measurement, while theoretical studies on femtosecond laser sources for photoacoustic nondestructive testing in nanoscale thin film materials are relatively scarce. This lack of research has led to the absence of a complete physical model that covers the entire process from laser excitation to photoacoustic signal measurement, forcing researchers to rely on trial and error to adjust laser parameters, which is inefficient and limits