THD Bench

Overview

mardi 14 février 2017, par Raphael Galicher

Typical contrast levels between 5 and 12 λ/D

  •  1e-8 in monochromatic light (at 640nm)
  • <5e-8 over 37% bandpass (Δλ = 250nm at 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, controled flux/spectrum)

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

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