  Any high-contrast imaging instrument in a future large space-based telescope
will include an integral field spectrograph (IFS) for measuring broadband
starlight residuals and characterizing the exoplanet's atmospheric spectrum. In
this paper, we report the development of a high-contrast integral field
spectrograph (HCIFS) at Princeton University and demonstrate its application in
multi-spectral wavefront control. Moreover, we propose and experimentally
validate a new reduced-dimensional system identification algorithm for an IFS
imaging system, which improves the system's wavefront control speed, contrast
and computational and data storage efficiency.
