论文标题
表征超低噪声远红外60-110 $ $ m $ m $ m $ m $ m $ m $ m $ m的光学响应
Characterising the optical response of ultra-low-noise far-infrared 60-110 $μ$m transition edge sensors
论文作者
论文摘要
远红外的过渡边缘传感器（TESS）正在为冷却的空间望远镜Spica上的Safari光栅光谱仪开发。为了支持这项工作，我们设计了一种低温测量的低温测量，以对超低液体进行精确的光学测量。尽管我们的设施适用于整个Safari波长范围34-230 $μ$ M，但我们使用具有噪声等效功率（NEP）为0.32 $ \ MATHRM {AW/\ sqrt {Hz}} $的设备使用具有噪声等效功率（NEP）的设备（NEP）为60-110 $ $ m。该系统能够执行一系列测量：（i）深色电特性。 （ii）相对于部分连贯的光束具有与理想成像望远镜相同的光效率。 （iii）光学饱和度和动态范围。 （iv）对调制热源的快速光学瞬态响应。 （v）在存在高级背景加载的情况下，光学瞬态响应。我们描述了黑暗测量值以确定TE的工作特性，然后将预测的光学行为与测量的光学行为进行比较。通过比较电气和光学瞬态响应，我们能够观察到设备中的热量。我们评论消除杂散光的挑战。
Far-infrared Transition Edge Sensors (TESs) are being developed for the SAFARI grating spectrometer on the cooled-aperture space telescope SPICA. In support of this work, we have devised a cryogenic (90 mK) test facility for carrying out precision optical measurements on ultra-low-noise TESs. Although our facility is suitable for the whole of the SAFARI wavelength range, 34-230 $μ$m, we focus on a representative set of measurements at 60-110 $μ$m using a device having a Noise Equivalent Power (NEP) of 0.32 $\mathrm{aW/\sqrt{Hz}}$. The system is able to perform a range of measurements: (i) Dark electrical characterisation. (ii) Optical efficiency with respect to a partially coherent beam having a modal composition identical to that of an ideal imaging telescope. (iii) Optical saturation and dynamic range. (iv) Fast optical transient response to a modulated thermal source. (v) Optical transient response in the presence of high-level background loading. We describe dark measurements to determine the operating characteristics of a TES, and then compare predicted optical behaviour with measured optical behaviour. By comparing electrical and optical transient response, we were able to observe thermalisation in the device. We comment on the challenge of eliminating stray light.
