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Updated: Jun 16, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Controllable rotation of optical beams with bored helical phases
Stein Alec Baluyot1, Nathaniel Hermosa
1Department of Physics, Ateneo de Manila University, Loyola Heights, Quezon City, Philippines 1108. scbaluyot@gmail.com
Abstract:
We achieve controllable noninterferometric rotation of a bored helical beam by introducing a phase shift exclusively to the annular helical region of the phase. We present a derivation based on the decomposition of the beams, which shows that a constant phase shift of DeltaPhi between the bore and the surrounding helical phase with topological charge l will rotate the intensity profile by -DeltaPhi/l about its center. The effect of the phase shifting is verified with experiments. This technique is simple, while it preserves the transverse intensity profiles of the beams. Our report may find applications in optical manipulation and trapping.
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