We have built a laboratory testbed called the Exoplanet Imaging System Testbed (EXIST) to develop future highcontrast imaging technologies. The main objective of the EXIST is the development of broadband coronagraph and wavefront control techniques. The EXIST is equipped with several fiber-coupled laser and broadband light sources to model star and planets. A spatial light modulator (SLM) is used to carry out the wavefront control in front of the coronagraph. We incorporated a variety of coronagraphic masks, including four-quadrant, eightoctant, and 12-sector phase masks. These masks exhibit second-, fourth-, and sixth-order starlight suppression properties, respectively. When combined with the wavefront control, higher-order coronagraphic masks provided better dark hole contrast. This paper reports on recent experimental results and prospects for future technological development at the EXIST.
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