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In this study, using only a single pulse, pump-probe measurement with a largetime window of more than 100 ps is implemented. A commercial grating is used toencode a time window of ~ 56 ps in a single pulse; therefore, there is no needfor machining customization. In addition, in this technique, the gratingsurface is accurately imaged, eliminating the image blur problem caused byphase differences in previous echelon-based techniques. Moreover, to make fulluse of the grating surface and obtain a larger time window, a simple reflectionechelon is combined that matches the grating in the time window. Thiscombination encoding strategy results in a total time window of ~ 109 ps andmaintains accurate imaging of the grating surface. This time window is an orderof magnitude greater than the maximum reported values of the echelon encodingstrategy and the angle beam encoding strategy. To demonstrate this single-shotpump-probe technique, the two-photon absorption process of ZnSe and theexcited-state absorption process of a symmetrical phenoxazinium bromine saltwere studied. The possibility of further improving the experimental setup isalso discussed.

Single-shot pump-probe technique by the combination of an echelon and a grating with a time window of 109 ps