Sparse aperture mask wavefront sensor

An article I co-authored with Princeton grad student Hari Subedi has been published by the Journal of Astronomical Telescopes, Instruments, and Systems: Coronagraph-Integrated Wavefront Sensing with a Sparse Aperture Mask . A sparse aperture mask, similar to the kind now in common use for high-angular resolution astronomical imaging (a recent example being Hinkley et al. 2015), is also effective at converting phase aberrations into diverse intensity patterns. By intercepting, collimating, masking, and finally refocusing the starlight rejected from a coronagraph focal plane, we therefore have a simple approach to sensing dynamic low-order aberrations of the kind that are problematic for space telescope coronagraphs such as the one envisioned for WFIRST-AFTA.

Fig2_SAM_WFS_diagram_v2_lores