Single-shot characterization of ultrashort laser pulses on wide-bandgap solid material

In this Letter, we focused on the precise and rapid characterization of infrared (IR) ultrashort laser pulses. We mapped the time delay between the strong excitation IR laser pulse and the perturbation IR laser pulse onto the transverse spatial coordinates of the ZnS crystal, a wide-bandgap material, where the modulated fluorescence signal was generated from strong-field multiphoton excitation with the perturbation. Under single-shot measurement, the temporal profile of IR laser pulses was reconstructed by recording and analyzing the modulated fluorescence signal. Furthermore, the presented scheme not only possessed the characteristic of single-shot measurement for high-power, low-repetition laser pulses but also had the measurement bandwidth range that fully covered the near-IR to IR bands, which provides the potential for characterization of single-cycle (even sub-cycle) IR laser pulses.