The device has a coherence tomography such as a frequency domain-optical coherence tomography (OCT) e.g. spectral OCT, including a light source for emitting light. A path of an optical path length is formed by an object arm and/or a reference arm of the tomography. The emitted light propagates along another path of another optical path length. The object arm or the reference arm is provided with swing-in and swing-out optical elements. The path lengths are provided by the respective swing-in and swing-out optical elements. A polarized beam splitter cube changes a characteristic of the light. An independent claim is also included for a method for determining a geometric value of regions of a transparent or diffusive object.
Frequency domain OCT