Single-shot dispersion-scan using a combination of prism and grating

The dispersion-scan technique (d-scan) is a well-established technique for the measurement of ultrashort laser pulses. While a single-shot version of d-scan is relatively easy to implement for sub-10 fs laser pulses, this becomes increasingly difficult as the pulse duration increases due to the need for a larger dispersion range, which scales quadratically with the Fourier transform limit (FTL). Here, we present a solution using a grism (a combination of prism and grating) to measure tens of femtosecond pulses without modifying the principle of the single-shot d-scan. Our grism, made of a zinc sulfide prism and a transmission grating, achieves a dispersion range window of 3200fs². We demonstrate this new method, to our knowledge, by characterizing pulses with an FTL of 25 fs and different spectral phases, comparing the results with a conventional d-scan.