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A cavity ringdown system for probing the spatial variation of optical lossacross high-reflectivity mirrors is described. This system is employed toexamine substrate-transferred crystalline supermirrors and quantify the effectof manufacturing process imperfections. Excellent agreement is observed betweenthe ringdown-generated spatial measurements and differential interferencecontrast microscopy images. A 2 mm diameter ringdown scan in the center of acrystalline supermirror reveals highly uniform coating properties with excessloss variations below 1 ppm.

Near-Infrared Scanning Cavity Ringdown for Optical Loss Characterization of Supermirrors