15 June 2006 A CMOS visible silicon imager hybridized to a Rockwell 2RG multiplexer as a new detector for ground based astronomy
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Abstract
For the past 25 years Charge Coupled Devices (CCDs) have been used as the preferred detector for ground based astronomy to detect visible photons. As an alternative to CCDs, silicon-based hybrid CMOS focal plane array technology is evolving rapidly. Visible hybrid detectors have a close synergy with IR detectors and are operated in a similar way. This paper presents recent test results for a Rockwell 2K x 2K silicon PIN diode array hybridized to a Hawaii-2RG multiplexer, the Hybrid Visible Silicon Imager (HyViSI). Since the capacitance of the integrating node of Si-PIN diodes is at least a factor of two smaller than the capacitance of the Hawaii-2RG IR detector pixel, lower noise was expected. However, those detectors suffer from interpixel capacitance which introduces an error to the value of the conversion factor measured with the photon transfer method. Therefore QE values have been overestimated by almost a factor of two in the past. Detailed test results on QE, noise, dark current, and other basic performance values as well as a discussion how to interpret the measured values will be presented. Two alternative methods, direct measurement of the nodal capacity and the use of Iron-55 X-rays to determine the actual nodal capacitance and hence the conversion factor will be briefly presented. PSF performance of this detector was analyzed in detail with an optical spot and single pixel reset measurement.
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Reinhold J. Dorn, Reinhold J. Dorn, Siegfried Eschbaumer, Siegfried Eschbaumer, Gert Finger, Gert Finger, Leander Mehrgan, Leander Mehrgan, Manfred Meyer, Manfred Meyer, Joerg Stegmeier, Joerg Stegmeier, "A CMOS visible silicon imager hybridized to a Rockwell 2RG multiplexer as a new detector for ground based astronomy", Proc. SPIE 6276, High Energy, Optical, and Infrared Detectors for Astronomy II, 627607 (15 June 2006); doi: 10.1117/12.671422; https://doi.org/10.1117/12.671422
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