| タイトル | High Contrast Vacuum Nuller Testbed (VNT) Contrast, Performance and Null Control |
| 本文（外部サイト） | http://hdl.handle.net/2060/20140005998 |
| 著者（英） | Clampin, Mark; Bolcar, Matthew R.; Madison, Timothy; Petrone, Peter; Lyon, Richard G.; Mallik, Udayan |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2012-08-22 |
| 言語 | eng |
| 内容記述 | Herein we report on our Visible Nulling Coronagraph high-contrast result of 109 contrast averaged over a focal planeregion extending from 14 D with the Vacuum Nuller Testbed (VNT) in a vibration isolated vacuum chamber. TheVNC is a hybrid interferometriccoronagraphic approach for exoplanet science. It operates with high Lyot stopefficiency for filled, segmented and sparse or diluted-aperture telescopes, thereby spanning the range of potential futureNASA flight telescopes. NASAGoddard Space Flight Center (GSFC) has a well-established effort to develop the VNCand its technologies, and has developed an incremental sequence of VNC testbeds to advance this approach and itsenabling technologies. These testbeds have enabled advancement of high-contrast, visible light, nulling interferometry tounprecedented levels. The VNC is based on a modified Mach-Zehnder nulling interferometer, with a W configurationto accommodate a hex-packed MEMS based deformable mirror, a coherent fiber bundle and achromatic phase shifters.We give an overview of the VNT and discuss the high-contrast laboratory results, the optical configuration, criticaltechnologies and null sensing and control. |
| NASA分類 | Astrophysics |
| レポートNO | GSFC-E-DAA-TN9420 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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