Roman Optical Telescope Assembly (OTA) Build and Integration Progress

The Nancy Grace Roman Space Telescope (RST) is a Hubble-class telescope with a large field of view for large surveys
of the sky, cold temperatures for enabling near infrared imaging, and controlled temperature stability for long exposures
and coronagraphy. The OTA includes the primary mirror, secondary mirror, and aft optics for guiding light into the Wide
Field Instrument and the Coronagraph Instrument. The testing of the optical assemblies and structures are nearly complete
in preparation for telescope integration. Pictures and descriptions of the assemblies are provided, followed by performance
results measured at these level of assemblies.

The assemblies are nearly complete as they are tested through thermal cycling to cold temperatures for infrared operation,
mechanical strength and vibration, and optically testing. Optical surface figure error results are shown for all the optical
surfaces.