Oct measurement

An optical system comprising:

• an optical coherence tomography (OCT) measuring device;
• a beam deflection unit for laterally deflecting the position or angle of a beam path of the OCT measuring device, wherein there is an optical component in the beam path, said optical component being embodied in such a way that a back-reflection of the optical component has a different configuration in terms of its longitudinal location along the beam path depending on the lateral position of the deflected beam path;
• and
• an evaluation unit which is embodied in such a way that a value of the lateral position or angle deflection of the beam deflection unit is determined on the basis of a longitudinal location of the back-reflection at the optical component determined by the OCT measuring device.

A device for determining a value of a changeable lateral position or angle deflection, the device comprising:

• a beam deflection unit for obtaining the changeable lateral position or angle deflection;
• an optical component, in particular a substantially transmissive optical component;
• an OCT measuring device for determining a longitudinal location of a back-reflection, which occurs along a beam path, deflected by the beam deflection unit, of measurement radiation of the OCT measuring device at the optical component;
• and
• an evaluation unit embodied in such a way that the value of the lateral position or angle deflection of the beam deflection unit is determinable on the basis of the longitudinal location of the back-reflection, determined by the OCT measuring device, at the optical component.