Abstract
We have published the optical design and early test results of the Roman Space Telescope grism spectrometer in previous SPIE proceedings. We report the follow-on activity of the spectral and radiometric calibrations, including the calibration methods, experiment designs, and test equipment calibration, such as the light source and detectors used in the test. The grism calibration includes the throughput versus wavelength, which is largely determined by the diffraction efficiency of the two diffractive surfaces. It also includes spectral resolution, point spread function, and relative radiometric measurements. The measured results are presented. The comparisons between the test data and the theoretical simulations are also presented. The tests and results presented are from the engineering test unit in ambient room temperature environment. The thermal/vacuum tests are planned to verify the results when the flight unit is ready.
Highlights
The Nancy Grace Roman Space Telescope (RST) is a NASA observatory designed to unravel the secrets of dark energy and dark matter, search for and image exoplanets, and explore many topics in infrared astrophysics
The Roman Space Telescope will serve as an important tool for the science community through its General Observer programs
The Engineering Test Unit (ETU) grism design used the same principle as the prototype described in Ref. 1
Summary
The Nancy Grace Roman Space Telescope (RST) is a NASA observatory designed to unravel the secrets of dark energy and dark matter, search for and image exoplanets, and explore many topics in infrared astrophysics. The low-resolution spectrograph is a prism assembly, which consists of two powered prisms.[3] The emphasis of this paper is to discuss the spectral and radiometric calibration and characterization of the grism spectrograph. It describes the calibration and characterization set up, the equipment used in the set up, and the radiometric and wavelength calibration accuracy. Gong et al.: Characterization of Nancy Grace Roman Space Telescope slitless spectrometer (grism) design of the testbed and the baseline wavefront quality of the testbed.
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More From: Journal of Astronomical Telescopes, Instruments, and Systems
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