Telecentric interferometer, method for determining a characteristic of an input light field, and interferometer assembly

Telecentric interferometer, comprising:

• a frontside optics comprising an exit pupil;
• a first interferometer arm that is part of a first optical system and is located at an image side of the frontside optics;
• and
• a second interferometer arm that is part of a second optical system and is located at the image side of the frontside optics;
• a detector that is located at an image side of both the first optical system and the second optical system;
• and
• a shifting unit located between the frontside optics and the detector;
• wherein the first optical system and the second optical system have an identical object-side focal length and an identical Gauss image distance;
• wherein the first optical system and the second optical system have an identically positioned object-side principal plane with an identical object-side optical axis;
• wherein the exit pupil of the frontside optics is distanced to the object-side principal plane by the object-side focal length;
• and
• wherein the shifting unit shifts an image-side principal plane of the first optical system and/or an image-side principal plane of the second optical system such that:
• the image-side principal plane of the first optical system is different from the image-side principal plane of the second optical system and
• an optical path length of the first interferometer arm equal to an optical path length of the second interferometer arm.