Abstract

As part of the conversion of the Multiple Mirror Telescope from six 1.8 m mirrors to one 6.5 m primary mirror, the telescope will be equipped with an adaptive f/15 secondary mirror optimized for the near infrared, λ = 1−5 µm. This mirror is a thin shell, 2 mm thick and 640 mm in diameter, supported on 320 voice-coil actuators which are mounted in a rigid substrate. A capacitive sensor at each actuator provides closed-loop position control with much higher bandwidth than the wavefront sensor alone allows. The geometry of the secondary is given below.

© 1995 Optical Society of America