Patent ID: 8339610

Claim:
A system for optical coherence tomography comprising: a light source for producing light, a first interferometer having a beam splitter, a first reflector and a second reflector, an optical distance of which from the beam splitter can be changed, a second interferometer, and an optical fibre for conveying light, wherein the light produced by the light source being injected into the first interferometer and being split by the beam splitter into a first partial beam in the direction of the first reflector and into a second partial beam in the direction of the second reflector, both partial beams being reflected by the first and the second reflector and the reflected partial beams being superposed in the beam splitter to a third partial beam the light of which is injected into the optical fibre and is conveyed from the latter to the second interferometer, the light injected into the first interferometer has a first number of transversal modes, and the optical fibre has at least one multi-mode fibre into which the light of the third partial beam is injected such that in the optical fibre a second number of transversal modes is stimulated which are conveyed to the second interferometer, the second number of transversal modes being substantially greater than the first number of transversal modes, by means of which the light conveyed to the second interferometer has a spatial coherence which is greatly reduced in comparison to the spatial coherence of the light injected into the first interferometer, and wherein the light of the third partial beam has an optical axis and the multi-mode fibre of the optical fibre has a central axis, the optical axis of the third partial beam being tilted with respect to the central axis of the multi-mode fibre of the optical fibre with the third partial beam being injected obliquely into the multi-mode fibre of the optical fibre, wherein the partial beams reflected by the first and the second reflector are superimposed in a common focus to the third partial beam, and wherein the multi-mode fibre of the optical fibre has an inlet plane and the common focus to the third partial beam does not come within the input plane of the multi-mode fibre.