An off-axis optical vortex tracked with a Laguerre-Gaussian transform localizes vortex positions more accurately than center-of-mass and reveals astigmatism as a tilt of the vortex trajectory.
Optical vortex metrology for nanometric speckle displacement measurement,
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Beam quality measurement through off-axis optical vortex
An off-axis optical vortex tracked with a Laguerre-Gaussian transform localizes vortex positions more accurately than center-of-mass and reveals astigmatism as a tilt of the vortex trajectory.