Optics and broadband antireflection coatings for the BA4-90/150 receiver
The BICEP Array telescopes search for primordial B-mode polarization from inflationary gravitational waves. This signal is exceedingly faint, demanding excellent map depth and systematics control. The new BA4-90/150 receiver introduces a wide 80–169 GHz dichroic band, requiring upgrades throughout the optics chain to r...