Automatic alignment of optical system using shape memory alloy

Minoru Sasaki, Yuji Arai, Kazuhiro Hane

Research output: Contribution to journalArticlepeer-review


Properties of the shape memory alloy of 29 μm thick Ni-Ti foil are investigated as an actuator to align optical elements. Since the intrinsic properties of the Ni-Ti foil are not satisfactory in reproducibility and hysteresis, a simple feedback control is used. A pinhole integrated with a surrounding position sensor is proposed to realize a confocal optical system having an automatic alignment function. Large displacement (∼mm) and precision at the level of the optical wavelength are found to be possible.

Original languageEnglish
Pages (from-to)584-587
Number of pages4
JournalOptical Review
Issue number5
Publication statusPublished - 1997 Jan 1


  • Alignment
  • Feedback control
  • Ni-Ti
  • Photodetector
  • Pinhole
  • Shape memory alloy
  • Two way shape memory effect

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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