LiteBIRD aims to detect the footprint of the primordial gravitational wave on the Cosmic Microwave Background (CMB) in a form of polarization pattern called B mode. In order to separate CMB from the Galactic emission, our
measurements cover 35 GHz to 450 GHz. The LiteBIRD optics consists of two telescopes: a crossed Dragone type for
lower frequencies, which provides a compact configuration with a wide field of view, and a refractor type for higher frequencies. The whole optical system is cooled down to around 5 K to minimize the thermal emission. We use two kinds of approaches of designing calculations as well as the experimental confirmation particularly for the lower
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Hajime Sugai ; Shingo Kashima ; Kimihiro Kimura ; Tomotake Matsumura ; Masanori Inoue, et al.
Optical designing of LiteBIRD
", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99044H (July 29, 2016); doi:10.1117/12.2232008; http://dx.doi.org/10.1117/12.2232008