This paper presents performance of very long wavelength infrared HgCdTe detectors operating at 60K for space surveillance and earth observation applications. Fabricated detector arrays were hybridized to Teledyne’s GeoSnap- 18 1024 x 512 read-out integrated circuit of 18-micron x 18-micron pixel format. This is a capacitive transimpedance amplifier pixel design with high linearity. Detector focal plane arrays are made of Teledyne’s high quality molecular beam epitaxy grown HgCdTe infrared detector materials with detector cut-offs near 13.5 microns at 60K. Key detector performance parameters of high operability with low dark currents, high quantum efficiency was demonstrated. One of the FPA was baked at 70oC under vacuum environment for 42 days; pre- and post-bake performance was compared. Dark current operability increased from 94% to 97% for pixels having dark currents ≤ 1.08E9 e-/s/pxl and noise operability also increased from 91% to 94% for pixels having total dark noise ≤ 815 e-/pxl. Obtained minimum dark current is on the order of 3E7 e-/s/pxl, which is a factor of four lower than the RULE07 for 13.24 microns cut off at 60K.
Raytheon Vision Systems (RVS) has a long history of providing state of the art infrared sensor chip assemblies (SCAs) for the astronomical community. This paper will provide an update of RVS capabilities for the community not only for the infrared wavelengths but also in the visible wavelengths as well. Large format infrared detector arrays are now available that meet the demanding requirements of the low background scientific community across the wavelength spectrum. These detector arrays have formats from 1k x 1k to as large as 8k x 8k with pixel sizes ranging from 8 to 27 μm. Focal plane arrays have been demonstrated with a variety of detector materials: SiPiN, HgCdTe, InSb, and Si:As IBC. All of these detector materials have demonstrated low noise and dark current, high quantum efficiency, and excellent uniformity. All can meet the high performance requirements for low-background within the limits of their respective spectral and operating temperature ranges.
Raytheon Vision Systems (RVS) has developed an efficient method to measure MTF on Visible through MWIR small pixel FPAs. The measured data was obtained using an advanced but low cost test set with sub μm target projection on the FPA and real time display of the LSF as the slit is walked through focus. The test set is commercially procured, maintained and calibrated, provides target and filter holders and a light source. The analysis summary includes references from simplified MTF published analysis tools and a list of artifacts to be aware of when measuring MTF. The SWIR and MWIR detectors have a Mesa structure geometry for improved MTF performance and the Visible has state of the art crosstalk control to provide excellent MTF performance. The modeled data is compared to measured tilted slit MTF measured data and shows close agreement.
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