Orbital-Angular-Momentum Quantum State Transformation Via a Nonlinear Process

Qi, Zhantong; Huang, Yi‐Wen; Lu, Chuanyi; Ni, Fengchao; Li, Yuanhua; Zheng, Yuanlin; Chen, Xianfeng

doi:10.1103/physrevapplied.19.014045

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…In future work, the concept of utilizing dynamic fields offers an intriguing prospect for enhancing the capabilities of the GS-OAM method [25,26]. The integration of dynamic field modulation into the OAM framework promises to bring about substantial improvements in terms of precision and control.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Micro-Vibration Measurement Based on Orbital Angular Momentum

Zhu,

Zou,

Wang

et al. 2023

Photonics

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In this study, we introduce a novel approach for dynamic micro-vibration measurement, employing an Orbital Angular Momentum (OAM) interferometer, where the reference beam is Gaussian (GS) and the measurement beam is OAM. The OAM light reflected back from the target carries information about the target’s vibrations. The interference of the OAM light with Gaussian light generates petal-shaped patterns, and the target’s vibration information can be measured by detecting the rotation angle of these petals. Our proposed method demonstrates enhanced tolerance to misalignment and superior precision. The effects of vibration frequency, CCD frame rates, and Topological Charges (TCs) on measurement accuracy are analyzed thoroughly. Experimental results reveal that the proposed method offers a higher accuracy (up to 22.34 nm) and an extended measurement range of (0–800 cm). These capabilities render our technique highly suitable for applications demanding nanometer-scale resolution in various fields, including precision engineering and advanced optical systems.

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Section: Discussionmentioning

confidence: 99%

Dynamic Micro-Vibration Measurement Based on Orbital Angular Momentum

Zhu,

Zou,

Wang

et al. 2023

Photonics

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Measurement of the integer and fractional topological charge of optical vortex beams by using crossed blades

Dehnavi

Sabouri

2023

Appl. Opt.

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Measurement of the topological charge (TC) of vortex beams, including integer and fractional orbital angular momentum, is of great importance in diverse fields. Here we first investigate the diffraction patterns of a vortex beam from crossed blades with different opening angles and positionings on the beam by a simulation and experiment. Then the positions and opening angles of the crossed blades that are sensitive to the variation of TC are selected and characterized. We show that for a specific position of the crossed blades on the vortex beam, the integer TC can be measured directly by counting the bright spots in the diffraction pattern. Moreover, we show experimentally that for other positions of the crossed blades, by calculating the first-order moment of the intensity of the diffraction pattern, the integer TC between −10 and 10 can be obtained. In addition, this method is used to measure the fractional TC and, as an example, the TC measurement is demonstrated for a range between 1 and 2 with 0.1 steps. The result of the simulation and experiment shows good agreement.

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Orbital angular momentum and rotational properties of off-axis vortex beams in two-dimensional media with anisotropic nonlocal nonlinearity

Liang,

Chen,

2024

Opt. Lett.

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By introducing anisotropy into nonlinear propagations, off-axis vortex beams exhibit significantly different characteristics compared to the isotropic case. The orbital angular momentum (OAM) is non-conservative and can periodically change between positive and negative values. Accordingly, the rotation of phase singularity can transit between clockwise and counterclockwise directions. Furthermore, the phase singularity can move to infinity when the OAM approaches zero. By using the Ehrenfest theorem, the motion of the beam center is obtained. Its trajectory can be circular and parabolic or follow other complex shapes, depending closely on the anisotropy of the nonlinearity. The rotational velocity of the beam center can be modulated by the nonlinearity anisotropy and can far exceed the initial value during its propagation. These results may find potential applications in beam shaping and optical manipulation.

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Orbital-Angular-Momentum Quantum State Transformation Via a Nonlinear Process

Cited by 3 publications

References 32 publications

Dynamic Micro-Vibration Measurement Based on Orbital Angular Momentum

Dynamic Micro-Vibration Measurement Based on Orbital Angular Momentum

Measurement of the integer and fractional topological charge of optical vortex beams by using crossed blades

Orbital angular momentum and rotational properties of off-axis vortex beams in two-dimensional media with anisotropic nonlocal nonlinearity

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