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23 July 2014 Optical characterization of ultra-sensitive TES bolometers for SAFARI
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We have characterized the optical response of prototype detectors for SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. SAFARI's three bolometer arrays will image a 2’×2’ field of view with spectral information over the wavelength range 34—210 μm. SAFARI requires extremely sensitive detectors (goal NEP ~ 0.2 aW/√Hz), with correspondingly low saturation powers (~5 fW), to take advantage of SPICA's cooled optics. We have constructed an ultra-low background optical test facility containing an internal cold black-body illuminator and have recently added an internal hot black-body source and a light-pipe for external illumination. We illustrate the performance of the test facility with results including spectral-response measurements. Based on an improved understanding of the optical throughput of the test facility we find an optical efficiency of 60% for prototype SAFARI detectors.
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Michael D. Audley, Gerhard de Lange, Jian-Rong Gao, Pourya Khosropanah, Philip D. Mauskopf, Dmitry Morozov, Neil A. Trappe, Stephen Doherty, and Stafford Withington "Optical characterization of ultra-sensitive TES bolometers for SAFARI", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91530E (23 July 2014);

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