  We present super-resolved coherent anti-Stokes Raman scattering (CARS)
microscopy by implementing phase-resolved image scanning microscopy (ISM),
achieving up to two-fold resolution increase as compared with a conventional
CARS microscope. Phase-sensitivity is required for the standard
pixel-reassignment procedure since the scattered field is coherent, thus the
point-spread function (PSF) is well-defined only for the field amplitude. We
resolve the complex field by a simple add-on to the CARS setup enabling inline
interferometry. Phase-sensitivity offers additional contrast which informs the
spatial distribution of both resonant and nonresonant scatterers. As compared
with alternative super-resolution schemes in coherent nonlinear microscopy, the
proposed method is simple, requires only low-intensity excitation, and is
compatible with any conventional forward-detected CARS imaging setup.
