Très Haut Dynamique 2 bench

Testbed name Managing institution
THD2 Observatoire de Paris
Contact person People willing to give talks
Raphaël Galicher Raphaël Galicher
Main scientific focus Testbed environment
Comparison of very high contrast imaging techniques for ground- and space-based telescopes: coronagraphy, apodization, wavefront sensing, DM controls, coherent differential imaging at 1e-9 contrast levels from 500 to 900 nm. Clean room, controlled in temperature and humidity.
Key hardware items Current status
  • 3 BMC DMs in cascades
  • one TT mirror
  • phase masks coronagraphs (FQPM, EOPM, vortex, DZPM, SLPM, and others)
  • 3 laser diodes (640nm, 700nm, 785nm)
  • one supercontinuum source (with lots of narrow/broad filters from 500nm to 900nm)
    		•  On activity with multiple of collaborations (see website).
    Software, languages Is our software shared?
  • Labview for the bench control (motors, DMs, etc)
  • IDL for calculations
    		•  It could be but not sure how useful to another bench it can be.

    Reference papers:
  • , et al.
  • Current limitation of the THD2 bench: the scatter issue, Potier et al. 2018
  • Active minimization of non-common path aberrations in long-exposure imaging of exoplanetary systems, Singh et al. 2019
  • Exoplanet direct imaging in ground-based conditions on THD2 bench, Potier et al. 2019
  • Comparing focal plane wavefront control techniques: Numerical simulations and laboratory experiments, Potier et al. 2020