Measurements of the optical performance of bolometers for SPICA/SAFARI

被引：4

作者：

Audley, Michael D. ^{[1
]}

de Lange, Gert ^{[1
]}

Gao, Jian-Rong ^{[2
,3
]}

Khosropanah, Pourya ^{[2
]}

Ridder, Marcel ^{[2
]}

Ferrari, Lorenza ^{[1
]}

Laauwen, Wouter M. ^{[1
]}

Ranjan, Manisha ^{[1
]}

Mauskopf, Philip D. ^{[4
]}

Morozov, Dmitry ^{[4
]}

Trappe, Neil A. ^{[5
]}

机构：

[1] SRON Netherlands Inst Space Res, Postbus 800, NL-9700 AV Groningen, Netherlands

[2] SRON Netherlands Inst Space Res, NL-3584 CA Utrecht, Netherlands

[3] Delft Univ Technol, Kavli Inst Nanosci, NL-2628CJ Delft, Netherlands

[4] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, Wales

[5] Natl Univ Ireland, Dept Expt Phys, Maynooth, Kildare, Ireland

来源：

MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VI | 2012年 / 8452卷

关键词：

Transition edge sensor; bolometer; SAFARI; optical testing; cryogenic illuminator;

D O I：

10.1117/12.925234

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 2x10(-19) W/root Hz) transition edge sensors with a transition temperature close to 100 mK. The extreme sensitivity and low saturation power (similar to 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%.

引用

页数：12