Patent ID: 7212290

Claim:
An interferometer system, comprising: a rhomboid assembly, comprising: a first optical stack, comprising: a first prism comprising a first vertical face and a first angled face; a second prism comprising a second angled face and a third angled face, wherein: the first prism is mounted to the second prism by fixing the first angled face to the second angled face; a first interface between the first and the second angled faces comprises a first polarizing beam-splitter (PBS); the third angled face comprises a first mirror; a second optical stack atop the first optical stack, comprising: a third prism comprising a second vertical face and a fourth angled face; a fourth prism comprising a fifth angled face and a sixth angled face, wherein: the third prism is mounted to the fourth prism by fixing the fourth angled face to the fifth angled face; a second interface between the fourth and the fifth angled faces comprises a second PBS; the sixth angled face comprises a second mirror; a first wave plate element, a second wave plate element, a third wave plate element, and a fourth wave plate element located in beam paths between the rhomboid assembly and at least one a measurement optic and a reference optic; and a redirecting optic located at least adjacent to the first vertical face and the second vertical face.