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MRO


SPACE OPTICS
Pleiade mirrors
Pleiade focal plane
Telescope - Export 1
KARI – Kompsat 3 - Telescope
KARI – Kompsat 3 - OGSE
T2L2 – Transfert de temps par liaison laser
LRA – SARAL – Massive Corner cube
Baffle – sunshade - cryostat polishing and coating
On going
ETGAR projet - For ELOP
SiC scanning mirror (ELOP)
ALADIN – FP Etalon

GROUND-BASED ASTRONOMY
VLT-DSM (Back Plate)
DES (corrector - 980mm lens)
OSIRIS (collimator)
LBT (first light secondary mirror)
MRO (secondary mirror)
WFCAM optics for UK-IR telescope
HRS-SALT Spectrograph optics (incl previous coll + cam)
PEPSI-cross dispersor (incl previous Large prisms)

SCIENTIFIC PROGRAMS
X-Ray Mirrors
High Power Lasers

TEST SYSTEMS
SOPHIE
BERSO
Solar Simulator
OGSE - KARI
On going

Secondary mirror for MRO

mro_thales00Thales Seso has manufactured (grinding, polishing and coating) the secondary mirror of the Magdalena Ridge Observatory (MRO). This is a challenging highly off axis convex aspherical mirror.

The main characteristics and specifications of this mirror are:

• Substrate: Lightened ULE structure with Corning fusion process
• Size : circular Φ690mm
• Shape: hyperbolic Convex with about 50µm asphericity from best fit sphere
• Optical quality required: WFE < 40nm for full CA
• Coating: protected aluminium

One of the main challenges of this mirror was the optical control because we are facing simultaneously different problems: a large mirror, an aspherical surface are, moreover, a convex one. Thales Seso has developed for this mirror a full aperture interferometric bench using a large sized Hindle corrector. Errors due to Hindle corrector itself and WFE distorsion induced by the natural gravity were managed and compensated thanks to a specific control iteration process.