Pixel-based spectral characterization of mid-infrared Si array detectors for astronomical observations in space

Abstract

Mid-infrared (IR) array detectors have been used for astronomical observations in space. However, the uniformities of their spectral response curves have not been investigated in detail, the understanding of which is important for spectroscopic observations using large array formats. We characterize the spectral responses of all the pixels in IR array detectors using a Fourier transform infrared spectrometer and cryogenic optics for measurements at high signal-to-noise ratios. We measured the spectral responses of the Si:As impurity band conduction (IBC) array, a flight back-up detector for AKARI/IRC. As a result, we find that the Si:As array has intrinsic variations in the spectral response along the row and column directions of the array. We also find that the cutoff wavelength of the Si:As IBC array depends on the intensity of the incident light.

arXiv comment14 pages, 10 figures. Accepted for publication in PASP

References in corpus (6)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The Infrared Spectrograph on the Spitzer Space Telescope
• The Infrared Astronomical Mission AKARI
• The Infrared Camera (IRC) for AKARI - Design and Imaging Performance
• The Mid-Infrared Instrument for the James Webb Space Telescope, VII: The MIRI Detectors
• Assessing the Suitability of H4RG Near Infrared Detectors for Precise Doppler Radial Velocity Measurements