Small deformable mirrors (DMs) produced using microelectromechanical systems (MEMS) techniques have been used
in thermally stable, bench-top laboratory environments. With advances in MEMS DM technology, a variety of field
applications are becoming more common, such as the Gemini Planet Imager’s (GPI) adaptive optics system.
Instruments at the Gemini Observatory operate in conditions where fluctuating ambient temperature, varying gravity
orientations and humidity and dust can have a significant effect on DM performance. As such, it is crucial that the
mechanical design of the MEMS DM mount be tailored to the environment. GPI’s approach has been to mount a 4096
actuator MEMS DM, developed by Boston Micromachines Corporation, using high performance optical mounting
techniques rather than a typical laboratory set-up. Flexures are incorporated into the DM mount to reduce deformations
on the optical surface due to thermal fluctuations. These flexures have also been sized to maintain alignment under
varying gravity vector orientations. This paper is a follow-up to a previous paper which presented the preliminary
design. The completed design of the opto-mechanical mounting scheme is discussed and results from finite element
analysis are presented, including predicting the stability of the mirror surface in varying gravity vectors and thermal
conditions.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexis Hill ; Steven Cornelissen ; Daren Dillon ; Charlie Lam ; Dave Palmer, et al.
"Flexure mount for a MEMS deformable mirror for the Gemini Planet Imager", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500H (September 13, 2012); doi:10.1117/12.926842; http://dx.doi.org/10.1117/12.926842