主权项 |
1. An optical interferometric device comprising:
a first optical path comprising a first reflector; a second optical path comprising a second reflector; and a multi-faceted optical element disposed in the first optical path, the multi-faceted optical element configured to be rotatable about a rotational axis and including a top surface, a bottom surface and a plurality of facets between the top and the bottom, the facets including a plurality of edges, each edge having a spatial extent, wherein the multi-faceted optical element has a refractive index characteristic such that an optical path length difference is introduced between electromagnetic radiation propagating along the first optical path and electromagnetic radiation propagating along the second optical path, the optical path length difference increasing from a first value to a second value greater than the first value, and wherein the number of the facets of the multi-faceted optical element is n such that the optical path length difference increases from the first value to the second value at least n times during one rotation of the multi-faceted optical element. |