Spectral shearing interferometer with broad applicability

We demonstrate a modified zero-additional-phase spectral phase interferometry for direct electric-field reconstruction setup, where two quasi-monochromatic auxiliary pulses employed for sum-frequency generation are derived from a 4f zero-dispersion compressor. With adequate flexibility and convenience to change the spectral shear and the frequencies of the auxiliary pulses, this device can cover a wide variety of ultrashort pulses with diverse central wavelengths, bandwidths, and durations. We show its applicability by measuring different pulses from three femtosecond sources.