  Time-resolved femtosecond stimulated Raman spectroscopy (FSRS) is a powerful
tool for investigating ultrafast structural and vibrational dynamics in light
absorbing systems. However, the technique generally requires exposing a sample
to high laser pulse fluences and long acquisition times to achieve adequate
signal-to-noise ratios. Here, we describe a timeresolved FSRS instrument built
around a Yb ultrafast amplifier operating at 200 kHz, and address some of the
unique challenges that arise at high repetition-rates. The setup includes
detection with a 9 kHz CMOS camera and an improved dual-chopping scheme to
reject scattering artifacts that occur in the 3-pulse configuration. The
instrument demonstrates good signal-to-noise performance while simultaneously
achieving a 3-6 fold reduction in pulse energy and a 5-10 fold reduction in
acquisition time relative to comparable 1 kHz instruments.
