Position measurement of non-integer OAM beams with structurally invariant propagation

Abstract

We present a design to generate structurally propagation invariant light beams carrying non-integer orbital angular momentum (OAM) using Hermite-Laguerre-Gaussian (HLG) modes. Different from previous techniques, the symmetry axes of our beams are fixed when varying the OAM; this simplifies the calibration technique for beam positional measurement using a quadrant detector. We have also demonstrated analytically and experimentally that both the OAM value and the HLG mode orientation play an important role in the quadrant detector response. The assumption that a quadrant detector is most sensitive at the beam center does not always hold for anisotropic beam profiles, such as HLG beams.

References in corpus (4)

• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• Twisting of light around rotating black holes
• Experimental demonstration of fractional orbital angular momentum entanglement of two photons
• How orbital angular momentum affects beam shifts in optical reflection

Cited by in corpus (7)

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• Response of QD to structured beams via convolution integrals
• Optical angular momentum derivation and evolution from vectorial field superposition
• Do optical quarks exist in free space: scalar treatment?
• Non-integer OAM beam shifts of Hermite-Laguerre-Gaussian beams
• Circularly Symmetric Light Waves: An Overview