Mr. Ronald Andronico Profile

Ronald Andronico

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Proceedings Article | 4 March 2019 Paper

Lens in a voice coil: a compact design approach for z-scanners

Thomas Ruppel, Ronny Andronico, Michael Deyerler, Robert Mastromattei

Proceedings Volume 10925, 1092513 (2019) https://doi.org/10.1117/12.2508614

KEYWORDS: Actuators, Surgery, Sensors, Laser therapeutics, Optical components, Position sensors, Eye, Lens design, Magnetism

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State of the art laser-based refractive surgery instruments require precise optical beam steering and focusing capabilities to actively control an operational laser beam during eye surgery. As part of an industrial collaboration, Celera Motion and SwissOptic AG worked on a novel design approach to realize a compact, actively controlled lens moving mechanism for beam focusing. This system incorporates a closed loop voice coil driven air bearing that integrates a focusing lens of 10mm in diameter in a low module footprint. The application driven design approach, modularity, and scalability of the solution will be presented together with results of the practical system evaluation. Thereby, the achieved optical alignment accuracy of the moving lens of only a few microns along a moving range of up to 80mm in combination with a lateral movement bandwidth up to 100 Hz indicate best agreement with the design requirements for the driving unit. Since the developed driving mechanism offers high system performance for additional applications, the authors will give further application examples and show scalability approaches for various lens diameters and moving ranges for customized z-scan units in optical systems. As part of future developments, design modifications for applications with higher bandwidth requirements and reduced module footprint with lower weight will be discussed.

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