LBT primary mirrors: the final design of the supporting system

摘要

The main final results in terms of stresses and optical performances are reported for the Large Binocular Telescope (LBT) primary mirrors. The two borosilicate LBT primary mirrors F/1.14 have 8.4m diameter and are produced at the Steward Observatory Mirror Lab (SOML). They are honeycomb shaped in order to achieve light weight, short thermal constant and high stiffness. The back plate is flat and the upper is paraboloid shaped. Each elementary cell has, in the lower plate, one circular hole permitting the ventilation of cell itself. The material used is the borosilicate Ohara E6.