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Exoplanet Science Seminar

Recent Activities of High-contrast Imaging Techniques Developed in Hokkaido University
Presented by Naoshi Murakami
Hokkaido University (on sabbatical at JPL March to December 2013)

Monday, December 2, 2013
12:00 noon in 169-336

Abstract
Our group has developed high-contrast imaging techniques for direct imaging of exoplanets under collaboration with many institutes. First, we have been developing focal-plane coronagraphic phase masks based on photonic-crystal technology. By utilizing the photonic crystals, we manufactured various coronagraphic phase masks with extremely small manufacturing defects. We also designed and manufactured pupil-remapping optics for removing a central obscuration due to a secondary mirror to enhance coronagraphic performance with conventional on-axis telescopes. Second, we proposed a new high-contrast instrument called the Savart-plate lateral-shearing interferometric nuller for exoplanets (SPLINE). The SPLINE is a visible nulling coronagraph based on polarization interferometry with a common- path optical configuration. We carried out laboratory experiments of the SPLINE, and demonstrated stable and achromatic deep nulling using a broadband light source. In this seminar, I will introduce our recent activities of the photonic-crystal coronagraph masks, the SPLINE experiments, and related techniques developed in Hokkaido University.

About the Speaker
May 2009 to Present: Assistant Professor, Division of Applied Physics, Faculty of Engineering, Hokkaido University, Hokkaido, Japan March through December 2013, on sabbatical at JPL


Center for Exoplanet Science


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