High Power Laser Science and Engineering, Volume. , Issue , ()
Temporal Characterization of Ultrashort Pulse via Reflected Four-Wave Mixing with Perturbation on Solid Surface [Early Posting]
Time-domain characterization of ultrashort pulses is essential for studying interactions between light and matter. Here, we propose and demonstrate an all-optical pulse sampling technique based on reflected four-wave mixing with perturbation on a solid surface. In this method, a weak perturbation pulse perturbs the four-wave mixing signal generated by a strong fundamental pulse. The modulation signal of the four-wave mixing, which is detected in the reflection geometry to ensure a perfect phase-matching condition, directly reflects the temporal profile of the perturbation pulse. We successfully characterized multi-cycle and few-cycle pulses using this method. The reliability of our approach was verified by comparing to the widely employed frequency-resolved optical gating (FROG) method. This technique provides a simple and robust method for characterizing ultrashort laser pulses.