Instrumental Design

REACH consists of mini-IFU like 7 single-mode Multi Core Fiber (MCF) located at a focus of SCExAO, a high-speed NIR photometric monitoring camera for the output beams from MCF, and a beam feed system from MCF to IRD’s single-mode fibers (SMF). Thanks to the wavefront correction by the Extreme-AO and a mode-filtering capability of SMF, speckle light injected into a fiber will be reduced by at least 2 orders of magnitude compared to the multi-mode fiber injection of IRD with AO188. A NIR photometric monitoring module in SCExAO will be used for fiber coupling optimization and real-time speckle nulling, which can further reduce the speckle light injected into fibers. The table below shows a summary of the specification for REACH.