BoxCARS 2D IR Spectroscopy with Pulse Shaping

BoxCARS and pump-probe geometries are common implementations of two dimensional infrared (2D IR) spectroscopy. BoxCARS is background-free, generally offering greater signal to noise ratio, which enables measuring weak vibrational echo signals. Pulse shapers have been implemented in the pump probe geometry to accelerate data collection and suppress scatter and other unwanted signals by precise control of the pump pulse delay and carrier phase. Here, we introduce a 2D IR optical setup in the BoxCARS geometry that implements a pulse shaper for rapid acquisition of background-free 2D IR spectra. We show a 3x signal to noise improvement using this new fast-scan BoxCARS setup versus the pump probe geometry within the same configuration.