Space instrumentation - MIRIM optics

Space instrumentation - MIRIM optics

Space instrumentation

MIRIM optics

As part of the MIRI instrument to be integrated in the focal plane of the James Webb space telescope, AMOS has been responsible for manufacturing the MIRI imager mirrors for CSL and the CEA. The MIRI imager comprises 5 mirrors and among them , 3 are associated in a TMA configuration.
Those mirrors for the mid-infrared range were manufactured in aluminium alloy by single-point diamond turning.

  • Mirror dia 75 radius 250: form: 11 nm RMS, Ra: < 2 nm
  • Demonstration Model (DM) - M1 mirror

Miri – M5
On board off-axis aspherical mirror in uncoated Aluminium on James Webb Space Telescope

  • Diamond Turning
  • Roughness: 5nm RMS
  • SFE: 60 nm RMS

Miri – CM1

  • Aluminium Off Axis Elliptic Mirror
  • Single Point Diamond Turning
  • Roughness: < 5nm RMS
  • SFE: 50 nm RMS
  • Useful aperture: Ø 18 nm

Miri – Fold 2

  • Flat Mirror
  • Roughness: 3nm RMS
  • SFE: 25 nm RMS


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