Fig. 4: Backscattering suppression and Q0 in a high-Q resonator.
From: Coherent suppression of backscattering in optical microresonators
a Backscattering amplitude measurement grid, with the resonator boundary and critical tip coupling line annotated. b Radial dependence of the backscattering suppression (circles, measurement; line, fit) along a radial line. The noise of the photodetector is indicated by the dotted grey line. Inset: suppression for all positions. The critical tip coupling at which the maximum suppression occurs is annotated. The measured suppression is limited by the photodetector noise. c Radial dependence of resonator and tip quality factor Q0 along a radial line. Inset: Q0 for all positions
