LAM-ONERA On-sky Pyramid Sensor

Testbed name Managing institution
LOOPS Laboratoire d'Astrophysique de Marseille (LAM) / ONERA
Contact person People willing to give talks
Pierre Janin-Potiron Pierre Janin-Potiron
Main scientific focus Testbed environment
LOOPS is an adaptive optics facility based at LAM. It provides a calibrated environment for research and development on the Pyramid Wavefront Sensor (PWFS) and Fourier-based Wavefront Sensor (FWFS). Among the topics related to the PWFS, the optical gain variation or the development of new reconstructors are of particular interest. The LOOPS tesbed is located in a grey room at LAM. The temperature and humidity are not controlled. An enclosure is planned to be installed on the bench to prevent from dust and parasite light.
Key hardware items Current status
  • A classical pyramid path using a four-sided monolithic pyramid wavefront sensor. The four sub-pupils are then re-imaged on an OCAM2 camera.
  • A Fourier-based warfront sensing path using a Spatial Light Modulator (SLM) to create any shape of focal phase mask and test new design of WFS. A second OCAM2 camera is used to measure the signal in the pupil plane.
  • A Shack-Hartman path to provide a wavefront sensing reference in order to compare the results obtained with the two other WFS.
  • An imaging path playing the role of the science camera where the closed-loop PSF is observed and the Sthrel ratio can be computed.
    		•  The bench is actually being re-aligned after not having been used for a while. A precise description of the bench (e.g. phase error at pupil planes, NCPA, Strehl ratio) will be presented in a paper in the months to come.
    Software, languages Is our software shared?
    Matlab (OOMAO) GitHub link

    Reference papers:
  • Optimized calibration of the adaptive optics system on the LAM Pyramid bench, Bond et al. 2017
  • DEVELOPMENT OF A PYRAMID WAVEFRONT SENSOR, El Hadi et al. 2013