Provided is a snapshot spectral domain optical coherence tomographer comprising a light source providing a plurality of beamlets； a beam splitter, splitting the plurality of beamlets into a reference arm and a sample arm； a first optical system that projects the sample arm onto multiple locations of a sample； a second optical system for collection of a plurality of reflected sample beamlets； a third optical system projecting the reference arm to a reflecting surface and receiving a plurality of reflected reference beamlets； a parallel interferometer that provides a plurality of interferograms from each of the plurality of sample beamlets with each of the plurality of reference beamlets； an optical image mapper configured to spatially separate the plurality of interferograms； a spectrometer configured to disperse each of the interferograms into its respective spectral components and project each interferogram in parallel； and a photodetector providing photon quantification.
