Patent ID: 7251039

Claim:
A interferometer assembly, comprising: a first input rhomb sub-assembly having a first input surface and a first output surface, a first amplitude-splitting non-polarizing interface being disposed therewithin; a second input rhomb sub-assembly having a second input surface and a second output surface, a second amplitude-splitting non-polarizing interface being disposed therewithin; a polarizing beam splitter sub-assembly comprising at least first, second and third faces and having a polarizing beam splitter interface located therewithin; wherein the first output surface of the first input rhomb sub-assembly is attached to the first face of the polarizing beam splitter sub-assembly, the second output surface of the second input rhomb sub-assembly is attached to the second face of the polarizing beam splitter sub-assembly, the input rhomb and the polarizing beam splitter sub-assemblies being configured and attached to one another to permit first and second beams having first and second frequencies, respectively, to enter the interferometer assembly spatially separated through the first and second input surfaces, respectively, the first and second amplitude-splitting non-polarizing interfaces splitting the first and second beams.