The 8.2 metre primary mirrors of the VLT

Details The 8.2 metre primary mirrors of the VLT The 8.2 metre primary mirrors of the VLT

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1271..266d&link_type=abstract

IN: Adaptive optics and optical structures; Proceedings of the Meeting, European Congress on Optics, 3rd, The Hague, Netherlands

Physics

Optics

Mirrors, Optical Equipment, Surface Properties, Telescopes, Very Long Base Interferometry, Active Control, Atmospheric Turbulence, Charge Coupled Devices, Polishing, Sensors

Scientific paper

The Very Large Telescope (VLT) presently being developed at ESO is described in terms of technological advances which make its use both technically effective and feasible. The VLT capitalizes on advances in materials, polishing techniques, and mirror support systems. The VLT consists of four 8-m alt-az telescopes and a 2-m auxiliary telescope in a single-dish configuration with Zerodur meniscus mirrors passively supported on a lateral system. A discussion of the tradeoffs between glass and metal mirrors is presented, and computerized polishing is described in relation to optical specifications. The mirror is supported with 150 axial and 60 lateral supports with electromechanical actuators to modulate applied force. The active optics concept is employed via the flexibility of the primary mirror, which generates elastomechanical deformations and the position and orientation of the secondary mirror.

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