Confocal imaging and phase imaging are powerful tools in life scienceresearch and industrial inspection. To coherently link the two techniques withdifferent depth resolutions, we introduce an optical frequency comb (OFC) tomicroscopy. Two-dimensional (2D) image pixels of a sample were encoded onto OFCmodes via 2D spectral encoding, in which OFC acted as an optical carrier with avast number of discrete frequency channels. Then, a scan-less full-fieldconfocal image with a depth resolution of 62.4 um was decoded from amode-resolved OFC amplitude spectrum obtained by dual-comb spectroscopy.Furthermore, a phase image with a depth resolution of 13.7 nm was decoded froma mode-resolved OFC phase spectrum under the above confocality. The phasewrapping ambiguity can be removed by the match between the confocal depthresolution and the phase wrapping period. The proposed hybrid microscopyapproach will be a powerful tool for a variety of applications.
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