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We demonstrate that time-domain ptychography, a recently introduced ultrafastpulse reconstruction modality, has properties ideally suited for the temporalcharacterization of complex light pulses with large time-bandwidth products asit achieves temporal resolution on the scale of a single optical cycle usinglong probe pulses, low sampling rates, and an extremely fast and robustalgorithm. In comparison to existing techniques, ptychography minimizes thedata to be recorded and processed, and drastically reduces the computationaltime of the reconstruction. Experimentally we measure the temporal waveform ofan octave-spanning, 3.5~ps long supercontinuum pulse generated in photoniccrystal fiber, resolving features as short as 5.7~fs with sub-fs resolution and30~dB dynamic range using 100~fs probe pulses and similarly large delay steps.

Measurement of complex supercontinuum light pulses using time domain ptychography