THD2
Full testbed name
Managing institution
Observatoire de Paris
Main scientific focus
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.
Environment of the testbed
Clean room, controlled in temperature and humidity.
Optical design map
Injection source
THD2 design
Key hardware items
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)
Current status
On activity with multiple of collaborations (see website).
Software language
Labview for the bench control (motors, DMs, etc) + IDL for calculations
Is this software shared?
It could be but not sure how useful to another bench it can be.
Reference papers
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