Electric field conjugation with the project 1640 coronagraph

Eric Cady; Christoph Baranec; Charles Beichman; Douglas Brenner; Rick Burruss; Justin Crepp; Richard Dekany; David Hale; Lynne Hillenbrand; Sasha Hinkley; E. Robert Ligon; Thomas Lockhart; Ben Oppenheimer; Ian Parry; Laurent Pueyo; Emily Rice; Lewis C. Roberts Jr.; Jennifer Roberts; Michael Shao; Anand Sivaramakrishnan; Remi Soummer; Hong Tang; Tuan Truong; Gautam Vasisht; Fred Vescelus; J. Kent Wallace; Chengxing Zhai; Neil Zimmerman

doi:10.1117/12.2024635

26 September 2013 Electric field conjugation with the project 1640 coronagraph

Eric Cady, Christoph Baranec, Charles Beichman, Douglas Brenner, Rick Burruss, Justin Crepp, Richard Dekany, David Hale, Lynne Hillenbrand, Sasha Hinkley, E. Robert Ligon, Thomas Lockhart, Ben Oppenheimer, Ian Parry, Laurent Pueyo, Emily Rice, Lewis C. Roberts Jr., Jennifer Roberts, Michael Shao, Anand Sivaramakrishnan, Remi Soummer, Hong Tang, Tuan Truong, Gautam Vasisht, Fred Vescelus, J. Kent Wallace, Chengxing Zhai, Neil Zimmerman

Author Affiliations +

Proceedings Volume 8864, Techniques and Instrumentation for Detection of Exoplanets VI; 88640K (2013) https://doi.org/10.1117/12.2024635
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

The Project 1640 instrument on the 200-inch Hale telescope at Palomar Observatory is a coronagraphic instru- ment with an integral eld spectrograph at the back end, designed to nd young, self-luminous planets around nearby stars. To reach the necessary contrast for this, the PALM-3000 adaptive optics system corrects for fast atmospheric speckles, while CAL, a phase-shifting interferometer in a Mach-Zehnder con guration, measures the quasistatic components of the complex electric eld in the pupil plane following the coronagraphic stop. Two additional sensors measure and control low-order modes. These eld measurements may then be combined with a system model and data taken separately using a white-light source internal to the AO system to correct for both phase and amplitude aberrations. Here, we discuss and demonstrate the procedure to maintain a half-plane dark hole in the image plane while the spectrograph is taking data, including initial on-sky performance.

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Eric Cady, Christoph Baranec, Charles Beichman, Douglas Brenner, Rick Burruss, Justin Crepp, Richard Dekany, David Hale, Lynne Hillenbrand, Sasha Hinkley, E. Robert Ligon, Thomas Lockhart, Ben Oppenheimer, Ian Parry, Laurent Pueyo, Emily Rice, Lewis C. Roberts Jr., Jennifer Roberts, Michael Shao, Anand Sivaramakrishnan, Remi Soummer, Hong Tang, Tuan Truong, Gautam Vasisht, Fred Vescelus, J. Kent Wallace, Chengxing Zhai, and Neil Zimmerman "Electric field conjugation with the project 1640 coronagraph", Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88640K (26 September 2013); https://doi.org/10.1117/12.2024635

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