Effect of hysteresis on the performance of deformable mirrors and methods of its compensation

Edward J. Kibblewhite*, Michael F. Smutko, Fang Shi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


The bandwidth of a servo controlling a deformable mirror should be determined by the time delays introduced by integration, read out, and analysis of the signals recorded by the wavefront detector. However, many types of piezoelectric actuators used in the construction of deformable mirrors exhibit considerable hysteresis which destabilizes the servo and requires a reduction in the stable system bandwidth. The effect of various degrees of hysteresis on the overall servo performance will be discussed together with methods of its compensation. These methods include `passive correction,' in which the effect of hysteresis is modeled by the servo system and `active correction,' in which the shape of the mirror is continuously measured with a wide bandwidth servo and is used as the error signal. We discuss both types of correction and present experimental results.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsMark A. Ealey, Fritz Merkle
Number of pages8
StatePublished - Dec 1 1994
EventAdaptive Optics in Astronomy - Kailua, HI, USA
Duration: Mar 17 1994Mar 18 1994


OtherAdaptive Optics in Astronomy
CityKailua, HI, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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