Fig. 1: a Signal from individual incoherent scatterers are summed linearly while they must be summed in quadrature for coherent signals meaning pixel reassignment must be done on the amplitude of coherent emitters in order to properly resolve features.
From: Super-resolved coherent anti-Stokes Raman scattering microscopy by coherent image scanning
b The phase impacts the total signal measured on the detector and having access to phase information distinguishes between resonant and nonresonant signal, which are generated with π/2 phase difference in CARS. c The excitation beam (red) defines the optical axis and constitutes the product of the Stokes (dark red) with the squared pump (green) ASF. The detection ASF (blue) represents the response to different locations of the source, assuming uniform illumination. The total response (gray) is the multiplication of the excitation and detection ASF and peaks at a distance described by Eq. (4).
