Roman Space Telescope Detector Characterization Refined

This paper details the characterization of a detector intended for, but ultimately not selected for flight on, the Nancy Grace Roman Space Telescope. The focus is on charge diffusion, a phenomenon that affects the precision of weak gravitational lensing measurements. The study uses laser speckle data to analyze the detector's modulation transfer function (MTF) and fits several models for the charge diffusion profile. The key finding is that a hyperbolic secant (sech) model provides a better fit than a Gaussian model, without requiring additional parameters. The sech model's standard deviation per axis is reported with both statistical and systematic errors. The absence of detectable wavelength dependence across a broad spectrum (850-2000 nm) is also significant. This research directly impacts the Roman mission by informing survey strategies and data processing pipelines, ultimately contributing to more accurate measurements of dark energy, exoplanets, and general astrophysics. The improved understanding of instrumental signatures is crucial for maximizing the scientific return of the Roman Space Telescope.

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