Fig1

 

The SPEED project is an instrumental facility to study high-contrast imaging techniques with a segmented telescope struggled to very close angular separations in view of the next generation of ground- and space-based observatories. The bench combines a segmented telescope simulator with 163 segments, co-phasing optics (in the optical domain), and multi-DM architecture combined with deep coronagraphic imaging (in the near-infrared). The scientific field of view is from 1 to 8 λ/D in the H-band. In term of key hardwares, the bench combines a super-continuum NKT light source, an integral sphere, a tip/tilt mirror, an IRIS AO PTT489 segmented deformable mirror, 2 Kilo-C deformable mirrors from Boston Micromachines, a SCC-PS and/or ZELDA-PS (cophasing sensors), a PIAACMC (coronagraph), and a SCC. The bench is currently under AIT phase in an ISO 7 room in the FIZEAU building. The SPEED project benefits from a wide local, national, and european supports (see at the bottom of the page).

In particular, the SPEED testbed searches for participating in the futur instrumental development of an exoplanet hunter around late type stars (M-stars). 

Three main research axes are studied: 

  • cophasing optics (fine cophasing and monitoring) from the scientifique image 
  • very small IWA coronagraphy (inner working angle)
  • active optics with multi-DM for high-contrast imaging (wavefront shaping for dark hole generation)

The testbed will also offer the possibility to study ELT inherent drawbacks from its segmented nature and emphasize the study of their impact on high-contrast (e.g., missing segment, cophasing residual, mixing XAO residuals and cophasing residuals, etc.)

All the SPEED OAPs have been  realized by the OCA optical workshop (D. Vernet).

 

Fig2Crédit: J. Dejonghe - C. Gouvret

3D CAO top view of the SPEED testbed. Color code: telescope simulator and common path (orange), visible path (brown) and near-infrared path (red). Acronyms: TTM - tip/tilt mirror, OAP - off-axis parabola, ASM - active segmented mirror, DM - deformable mirror, FM - flat mirror, DIC - dichroic, L - lens, SCC-PS - self-coherent camera-phasing sensor, FPM - focal plan (mask), PIAA-M1 & PIAA-M2 - phase induced amplitude apodization mirror 1 & 2, LS - Lyot stop, APOGEE - visible camera, RASOIR - near-infrared camera.

 

Fig3 Simulated pupil of the  SPEED telescope simulator exhibiting 30% central obscuration, 6 spiders and 163 segments. 

 

Fig4

Simulated NiR PSF image. Blue circle defines the wavefront shaping DMs cut-off frequency. Red circle defines the field of view (FoV) targetted by the project and restricted to small angular separations. Green circles localized the first diffractive signatures from the primary mirror segmentation.   

 

Fig7