Measurements of the optical performance of bolometers for SPICA/SAFARI

Michael D. Audley; Gert De Lange; Jian Rong Gao; Pourya Khosropanah; Marcel Ridder; Lorenza Ferrari; Wouter M. Laauwen; Manisha Ranjan; Philip D. Mauskopf; Dmitry Morozov; Neil A. Trappe

doi:10.1117/12.925234

Measurements of the optical performance of bolometers for SPICA/SAFARI

Michael D. Audley, Gert De Lange, Jian Rong Gao, Pourya Khosropanah, Marcel Ridder, Lorenza Ferrari, Wouter M. Laauwen, Manisha Ranjan, Philip D. Mauskopf, Dmitry Morozov, Neil A. Trappe

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 Scopus citations

Abstract

We have measured the optical response of detectors designed for SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. To take advantage of SPICA's cooled optics, SAFARI's three bolometer arrays are populated with extremely sensitive (NEP∼2×10^-19 W/√Hz) transition edge sensors with a transition temperature close to 100 mK. The extreme sensitivity and low saturation power (∼4 fW) of SAFARI's detectors present challenges to characterizing them. We have therefore built up an ultra-low background test facility with a cryogen-free high-capacity dilution refrigerator, paying careful attention to stray-light exclusion. Our use of a pulse-tube cooler to pre-cool the dilution refrigerator required that the SAFARI Detector System Test Facility provide a high degree electrical, magnetic, and mechanical isolation for the detectors. We have carefully characterized the performance of the test facility in terms of background power loading. The test facility has been designed to be flexible and easily reconfigurable with internal illuminators that allow us to characterize the optical response of the detectors. We describe the test facility and some of the steps we took to create an ultra-low background test environment. We have measured the optical response of two detectors designed for SAFARI's short-wave wavelength band in combination with a spherical backshort and conical feedhorn. We find an overall optical efficiency of 40% for both, compared with an ideal-case predicted optical efficiency of 66%.

Original language	English (US)
Title of host publication	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
DOIs	https://doi.org/10.1117/12.925234
State	Published - Dec 1 2012
Externally published	Yes
Event	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI - Amsterdam, Netherlands Duration: Jul 3 2012 → Jul 6 2012

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	8452
ISSN (Print)	0277-786X

Other

Other	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Country/Territory	Netherlands
City	Amsterdam
Period	7/3/12 → 7/6/12

Keywords

Bolometer
Cryogenic illuminator
Optical testing
SAFARI
Transition edge sensor

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.925234

Cite this

Audley, M. D., De Lange, G., Gao, J. R., Khosropanah, P., Ridder, M., Ferrari, L., Laauwen, W. M., Ranjan, M., Mauskopf, P. D., Morozov, D., & Trappe, N. A. (2012). Measurements of the optical performance of bolometers for SPICA/SAFARI. In Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI Article 84520B (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8452). https://doi.org/10.1117/12.925234

Measurements of the optical performance of bolometers for SPICA/SAFARI. / Audley, Michael D.; De Lange, Gert; Gao, Jian Rong et al.
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI. 2012. 84520B (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8452).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Audley, MD, De Lange, G, Gao, JR, Khosropanah, P, Ridder, M, Ferrari, L, Laauwen, WM, Ranjan, M, Mauskopf, PD, Morozov, D & Trappe, NA 2012, Measurements of the optical performance of bolometers for SPICA/SAFARI. in Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI., 84520B, Proceedings of SPIE - The International Society for Optical Engineering, vol. 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, Amsterdam, Netherlands, 7/3/12. https://doi.org/10.1117/12.925234

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abstract = "We have measured the optical response of detectors designed for SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. To take advantage of SPICA's cooled optics, SAFARI's three bolometer arrays are populated with extremely sensitive (NEP∼2×10-19 W/√Hz) transition edge sensors with a transition temperature close to 100 mK. The extreme sensitivity and low saturation power (∼4 fW) of SAFARI's detectors present challenges to characterizing them. We have therefore built up an ultra-low background test facility with a cryogen-free high-capacity dilution refrigerator, paying careful attention to stray-light exclusion. Our use of a pulse-tube cooler to pre-cool the dilution refrigerator required that the SAFARI Detector System Test Facility provide a high degree electrical, magnetic, and mechanical isolation for the detectors. We have carefully characterized the performance of the test facility in terms of background power loading. The test facility has been designed to be flexible and easily reconfigurable with internal illuminators that allow us to characterize the optical response of the detectors. We describe the test facility and some of the steps we took to create an ultra-low background test environment. We have measured the optical response of two detectors designed for SAFARI's short-wave wavelength band in combination with a spherical backshort and conical feedhorn. We find an overall optical efficiency of 40% for both, compared with an ideal-case predicted optical efficiency of 66%.",

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AU - De Lange, Gert

AU - Gao, Jian Rong

AU - Khosropanah, Pourya

AU - Ridder, Marcel

AU - Ferrari, Lorenza

AU - Laauwen, Wouter M.

AU - Ranjan, Manisha

AU - Mauskopf, Philip D.

AU - Morozov, Dmitry

AU - Trappe, Neil A.

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N2 - We have measured the optical response of detectors designed for SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. To take advantage of SPICA's cooled optics, SAFARI's three bolometer arrays are populated with extremely sensitive (NEP∼2×10-19 W/√Hz) transition edge sensors with a transition temperature close to 100 mK. The extreme sensitivity and low saturation power (∼4 fW) of SAFARI's detectors present challenges to characterizing them. We have therefore built up an ultra-low background test facility with a cryogen-free high-capacity dilution refrigerator, paying careful attention to stray-light exclusion. Our use of a pulse-tube cooler to pre-cool the dilution refrigerator required that the SAFARI Detector System Test Facility provide a high degree electrical, magnetic, and mechanical isolation for the detectors. We have carefully characterized the performance of the test facility in terms of background power loading. The test facility has been designed to be flexible and easily reconfigurable with internal illuminators that allow us to characterize the optical response of the detectors. We describe the test facility and some of the steps we took to create an ultra-low background test environment. We have measured the optical response of two detectors designed for SAFARI's short-wave wavelength band in combination with a spherical backshort and conical feedhorn. We find an overall optical efficiency of 40% for both, compared with an ideal-case predicted optical efficiency of 66%.

AB - We have measured the optical response of detectors designed for SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. To take advantage of SPICA's cooled optics, SAFARI's three bolometer arrays are populated with extremely sensitive (NEP∼2×10-19 W/√Hz) transition edge sensors with a transition temperature close to 100 mK. The extreme sensitivity and low saturation power (∼4 fW) of SAFARI's detectors present challenges to characterizing them. We have therefore built up an ultra-low background test facility with a cryogen-free high-capacity dilution refrigerator, paying careful attention to stray-light exclusion. Our use of a pulse-tube cooler to pre-cool the dilution refrigerator required that the SAFARI Detector System Test Facility provide a high degree electrical, magnetic, and mechanical isolation for the detectors. We have carefully characterized the performance of the test facility in terms of background power loading. The test facility has been designed to be flexible and easily reconfigurable with internal illuminators that allow us to characterize the optical response of the detectors. We describe the test facility and some of the steps we took to create an ultra-low background test environment. We have measured the optical response of two detectors designed for SAFARI's short-wave wavelength band in combination with a spherical backshort and conical feedhorn. We find an overall optical efficiency of 40% for both, compared with an ideal-case predicted optical efficiency of 66%.

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Measurements of the optical performance of bolometers for SPICA/SAFARI

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