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Calibration of Deformable Mirrors for Open-Loop Control.

Marcel Leutenegger1, Stefan W Hell1

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Summary
This summary is machine-generated.

This study introduces a new calibration method for deformable mirrors, allowing users to validate and enhance manufacturer data. This improves open-loop control accuracy in optical systems.

Keywords:
deformable mirror controloff-axis interferometryphase unwrapping

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Area of Science:

  • Optics and Optical Engineering
  • Metrology

Background:

  • Deformable mirrors (DMs) are crucial for wavefront control in optical systems, used for aberration compensation and beam scanning.
  • Manufacturers provide calibration data for open-loop control, but user validation is often limited.
  • Existing calibration methods may not fully capture the dynamic response of individual DMs.

Purpose of the Study:

  • To develop and demonstrate a user-centric calibration method for deformable mirrors.
  • To enable independent validation and improvement of manufacturer-provided calibration data.
  • To enhance the accuracy and fidelity of wavefront control using DMs.

Main Methods:

  • An imaging off-axis Michelson interferometer was designed and constructed for precise mirror topography measurement.
  • The calibration method involves measuring the response of each actuator across its full operational range.
  • High accuracy and sufficient spatial resolution were achieved in the topographic measurements.

Main Results:

  • The developed calibration method successfully measured the mirror topography with high accuracy.
  • The user-performed calibration allowed for the validation and refinement of existing calibration data.
  • Open-loop performance of the deformable mirror was demonstrably improved after applying the new calibration.

Conclusions:

  • The reported calibration method empowers users to independently verify and enhance deformable mirror performance.
  • This approach leads to more accurate wavefront control and improved optical system performance.
  • Independent calibration is essential for maximizing the potential of deformable mirror technology.