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Design methodology and evaluation of a high performance MWIR interferometer

Seeking and tracking high thermal signature targets requires extreme precision to protect assets and prevent misidentification of threats. In these situations, the midwave infrared (MWIR) region of the electromagnetic spectrum is the ideal wavelength range for optical detection. Systems used in these scenarios have stringent transmitted wavefront and performance requirements, often needing optical alignment tools that can be adapted to the wavelength specifications and test configurations unique to the optical system being built and tested. Discussed here is a high performance MWIR Twyman-Green-style interferometer with a dual port configuration. This system was designed to allow for multiple simultaneous test setups – including expanded beams – while maintaining high-accuracy wavefront measurements in both well-controlled and turbulent environments. This paper presents design methodology and performance of the interferometer with special consideration for cost, usability, and maintaining test configurations and functionality.