Lyot-based low order wavefront sensor: Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its laboratory performance

Garima Singh, Olivier Guyon, Pierre Baudoz, Nemanja Jovanovich, Frantz Martinache, Tomoyuki Kudo, Eugene Serabyn, Jonas G. Kuhn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

High throughput, low inner working angle (IWA) phase masks coronagraphs are essential to directly image and characterize (via spectroscopy) earth-like planets. However, the performance of low-IWA coronagraphs is limited by residual pointing errors and other low-order modes. The extent to which wavefront aberrations upstream of the coronagraph are corrected and calibrated drives coronagraphic performance. Addressing this issue is essential for preventing coronagraphic leaks, thus we have developed a Lyot-based low order wave front sensor (LLOWFS) to control the wavefront aberrations in a coronagraph. The LLOWFS monitors the starlight rejected by the coronagraphic mask using a reflective Lyot stop in the downstream pupil plane. The early implementation of LLOWFS at LESIA, Observatoire de Paris demonstrated an open loop measurement accuracy of 0.01 λ/D for tip-tilt at 638 nm when used in conjunction with a four quadrant phase mask (FQPM) in the laboratory. To further demonstrate our concept, we have installed the reflective Lyot stops on the Subaru Coronagraphic Extreme AO (SCExAO) system at the Subaru Telescope and modified the system to support small IWA phase mask coronagraphs (< 1λ/D) on-sky such as FQPM, eight octant phase mask, vector vortex coronagraph and the phase induced amplitude apodization complex phase mask coronagraph with a goal of obtaining milli arc-second pointing accuracy. Laboratory results have shown the measurement of tip, tilt, focus, oblique and right astigmatism at 1.55 μm for the vector vortex coronagraph. Our initial on-sky result demonstrate the closed loop accuracy of < 7 x 10-3 λ/D at 1.6 μm for tip, tilt and focus aberrations with the vector vortex coronagraph.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9148
ISBN (Print)9780819496164
DOIs
StatePublished - 2014
Externally publishedYes
EventAdaptive Optics Systems IV - Montreal, Canada
Duration: Jun 22 2014Jun 27 2014

Other

OtherAdaptive Optics Systems IV
CountryCanada
CityMontreal
Period6/22/146/27/14

Fingerprint

Extreme Adaptive Optics
Coronagraph
Wavefront Sensor
Adaptive optics
coronagraphs
Wavefronts
adaptive optics
Masks
Mask
masks
sensors
Sensors
Tip-tilt
Aberrations
Vortex flow
wave fronts
Aberration
aberration
Vortex
Quadrant

Keywords

  • Coronagraph
  • Extreme Adaptive Optics
  • High Contrast Imaging

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Singh, G., Guyon, O., Baudoz, P., Jovanovich, N., Martinache, F., Kudo, T., ... Kuhn, J. G. (2014). Lyot-based low order wavefront sensor: Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its laboratory performance. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9148). [914848] SPIE. https://doi.org/10.1117/12.2057211

Lyot-based low order wavefront sensor : Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its laboratory performance. / Singh, Garima; Guyon, Olivier; Baudoz, Pierre; Jovanovich, Nemanja; Martinache, Frantz; Kudo, Tomoyuki; Serabyn, Eugene; Kuhn, Jonas G.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9148 SPIE, 2014. 914848.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Singh, G, Guyon, O, Baudoz, P, Jovanovich, N, Martinache, F, Kudo, T, Serabyn, E & Kuhn, JG 2014, Lyot-based low order wavefront sensor: Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its laboratory performance. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 9148, 914848, SPIE, Adaptive Optics Systems IV, Montreal, Canada, 6/22/14. https://doi.org/10.1117/12.2057211
Singh G, Guyon O, Baudoz P, Jovanovich N, Martinache F, Kudo T et al. Lyot-based low order wavefront sensor: Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its laboratory performance. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9148. SPIE. 2014. 914848 https://doi.org/10.1117/12.2057211
Singh, Garima ; Guyon, Olivier ; Baudoz, Pierre ; Jovanovich, Nemanja ; Martinache, Frantz ; Kudo, Tomoyuki ; Serabyn, Eugene ; Kuhn, Jonas G. / Lyot-based low order wavefront sensor : Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its laboratory performance. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9148 SPIE, 2014.
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