What is the fine-grained topic of the following text: ELECTROSTATIC MICRO-DEFORMABLE MIRROR BASED ON POLYMER MATERIALS FREDERIC ZAMKOTSIAN, PATRICK LANZONI Laboratoire dxstrophysique de Marseille, 2, place Le Verrier, 13248 Marseille Cedex 4, France VERONIQUE CONEDERA, NORBERT FABRE LAAS-CNRS, 7 avenue du colonel Roche, 31077 Toulouse cedex, France MOEMS-based electrostatic micro-deformable mirrors (MDM) are promising for future AO systems. Only return the topic.
The fine-grained topic of the text is "Electrostatic Micro-Deformable Mirrors Based on Polymer Materials."