AI 中文总结
针对CMB实验中傅里叶变换光谱仪（FTSes）受系统误差限制的问题，研究人员开发并升级了频率可选激光源（FLS）校准器，完成其表征并制定了野外微波仪器测试计划，以改进CMB通带测量。
AI 中文摘要
宇宙微波背景（CMB）实验面临的最大挑战之一是仪器通带校准的不确定性，通带不确定性会限制前景去除和光谱拟合，而这些对暴胀和星系团测量至关重要。当前CMB实验使用傅里叶变换光谱仪（FTSes）测量仪器通带，但FTS系统目前受限于系统误差，因此通带测量的显著改进需要新型校准器。为此，我们开发了频率可选激光源（FLS）校准器，其采用频率可调的激光并耦合至激光功率衰减系统。在对首款FLS原型进行初步测试后，我们开发了性能提升的校准器升级版本。本文介绍FLS校准器的升级内容、升级后校准器及新型激光源的表征，以及在野外微波仪器上进行测试的计划。
英文摘要
One of the biggest challenges for Cosmic Microwave Background (CMB) experiments comes from the uncertainty in instrument bandpass calibration. Uncertainties in bandpass can limit foreground removal and spectral fitting, which are critical for inflationary and galaxy cluster measurements. CMB experiments currently use Fourier Transform Spectrometers (FTSes) to measure instrument bandpasses. However, FTS systems are currently systematics-limited, so significant improvements in bandpass measurements require novel calibrators. To this end, we developed a Frequency-selectable Laser Source (FLS) calibrator, which uses a laser with adjustable frequency coupled to a system that allows for laser power attenuation. Following initial testing with the first FLS prototype, we developed an upgraded version of the calibrator with improved performance. We present the upgrades to the FLS calibrator, the characterization of the upgraded calibrator and new laser source, and plans for testing with microwave instruments in the field.
Comments13 pages, 7 figures, submitted to Proc. SPIE
