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Journal Article

Adjustable diffractive spiral phase plates

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Harder,  Irina
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Lindlein,  Norbert
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Harm, W., Bernet, S., Ritsch-Marte, M., Harder, I., & Lindlein, N. (2015). Adjustable diffractive spiral phase plates. OPTICS EXPRESS, 23(1), 413-421. doi:10.1364/OE.23.000413.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6428-9
Abstract
We report on the fabrication and the experimental demonstration of Moire diffractive spiral phase plates with adjustable helical charge. The proposed optical unit consists of two axially stacked diffractive elements of conjugate structure. The joint transmission function of the compound system corresponds to that of a spiral phase plate where the angle of mutual rotation about the central axis enables continuous adjustment of the helical charge. The diffractive elements are fabricated by gray-scale photolithography with a pixel size of 200 nm and 128 phase step levels in fused silica. We experimentally demonstrate the conversion of a TEM00 beam into approximated Laguerre-Gauss (LG) beams of variable helical charge, with a correspondingly variable radius of their ring-shaped intensity distribution. (C) 2015 Optical Society of America