Overview

mardi 30 avril 2019, par Raphael Galicher

Performance

  • Contrast level at  1e-8 in monochromatic light between 5 and 12 λ/D, at 640nm
  • Contrast level below 5e-8 over a 37% bandpass between 5 and 12 λ/D, with Δλ = 250nm centered on 650nm

Main characteristics of the THD2 bench

  • Source unit
    • broadband (450 to 950nm) supercontinuum source + filter wheel
    • Laser diodes at 638nm, 705 nm, and 785nm
    • Flat-field source at 650nm
    • Fluxmeter and spectrometer (continuous measurements)
  • 4 active mirrors
    • Tip-tilt mirror
    • 34x34 Boston Michromachines
    • 32x32 Boston Michromachines
    • 12x12 Boston Michromachines
  • 3 detectors
    • Science channel : 2 detectors (100Hz/3e-RON or 200Hz/18e-RON)
    • Low order wavefront sensor channel : 500Hz/18e-
  • Calibration and housekeeping
    • Motorized alignements
    • 10 temperature/humidity sensors
    • Controlled flux/spectrum

PDF document for more details on the bench configurations and on performance (May 2016).

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