  We demonstrate a femtosecond pump-probe spectrometer which utilizes a white
light supercontinuum as input, and relies on mutual synchronization of
acousto-optical chopper, pump-probe delay stage and the CCD camera to record
shot-to-shot pump-probe spectra while the pump-probe delay is scanned
synchronously with the laser repetition rate. The unique combination of
technologies implemented here allows for electronically controllable and
repetition-rate scalable detection throughput that is only limited by the
camera frame rate. Despite RMS white-light probe fluctuations of ~5.5%, fully
leveraging the temporal correlations in white light and fine sampling of
pump-probe delay along with 30x reduction in equivalent data collection time
compared to stepwise scanning leads to reduction of RMS noise without
multichannel referencing down to ~0.33 mOD for a scattering nanotube sample.
This demonstration opens door for impulsive pump-probe micro-spectroscopy of
scattering samples with broadband spectral coverage and minimized sample
exposure.
