One-shot three-dimensional imaging using a two-dimensional spectrometer with a fiber bundle

Using spectral interference from a chirped optical frequency comb, we developed a one-shot three-dimensional (3D) imaging method. We formed a two-dimensional spectrometer using fiber bundles made up of single-mode and multi-mode fibers to detect the spectral interference fringe images. The proposed method demonstrated one-shot 3D imaging of reflective targets with sub-mu m level depth uncertainty and a wide dynamic range of 6 digits. Furthermore, by developing a method to remove the speckle noise caused by multi-mode fibers, we succeeded in capturing 3D profiles with sub-mu m uncertainty in a one-shot with 299 times higher efficiency than single-mode fibers using a large numerical aperture. (C) 2021 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement