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Characterization of a bimorph deformable mirror using stroboscopic phase-shifting interferometry.

David A Horsley1, Hyunkyu Park, Sophie P Laut

  • 1Department of Mechanical, Aeronautical Engineering, University of California, Davis, United States.

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This study characterizes a 35-actuator bimorph deformable mirror (DM) for adaptive optics. Researchers measured its static and dynamic performance, finding good agreement between experimental results and theoretical models for this electrostrictive ceramic device.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Mechanical Engineering

Background:

  • Adaptive optics systems require precise control over optical wavefronts.
  • Deformable mirrors (DM) are key components in adaptive optics, enabling wavefront correction.
  • Electrostrictive ceramics, like lead magnesium niobate (PMN), offer potential for DM actuation due to their strain response to electric fields.

Purpose of the Study:

  • To characterize the static and dynamic performance of a 35-actuator bimorph deformable mirror (DM).
  • To evaluate the DM's ability to correct optical aberrations using Zernike polynomials.
  • To validate experimental measurements against theoretical predictions for DM behavior.

Main Methods:

  • Developed a custom stroboscopic phase-shifting interferometer to measure mirror deformation under applied voltage.
  • Assessed static performance by testing the DM's ability to replicate Zernike polynomial aberrations.
  • Measured natural frequencies up to 20 kHz using stroboscopic interferometry and a laser Doppler vibrometer (LDV).
  • Analyzed surface profiles by fitting to theoretical mode-shapes derived from classical plate theory.

Main Results:

  • The bimorph DM demonstrated the ability to replicate various optical aberrations.
  • Natural frequencies were measured and found to be in good agreement with theoretical predictions.
  • The custom interferometer effectively measured DM surface deformations.

Conclusions:

  • The characterized 35-actuator PMN bimorph DM is suitable for adaptive optics applications.
  • Experimental measurements of static and dynamic characteristics align well with theoretical models.
  • The developed stroboscopic interferometry technique is effective for DM characterization.