Abstract
In this study, we generate various complex beams carrying angular momentum (AM) by using a programmable beam shaping system to mimic typical q-plates. When a circularly polarized wave is incident onto the system, the emerging beam reverses its spin handedness and obtains a spatial phase factor. This phase factor can be engineered by designing a computer-generated hologram (CGH) and applying it to a spatial light modulator (SLM) to produce a beam with controllable spatially distributed orbital angular momentum (OAM) density. To determine the properties of the generated fields, we combine digital holography (DH) with the beam shaping system to yield visualizations of the beam intensity, phase, and AM distributions over the transverse plane at different propagation distances. Comparisons of the theoretically and experimentally obtained results show good qualitative agreement. This study advances our understanding and interpretation of AM characteristics produced by a programmable q-plate-like system.
Highlights
It is well known that photons carry linear momentum and angular momentum (AM)[1]
Two blazed gratings with an equal but opposite periodicity of 9.5 pixels oriented at 45° relative to the x-axis are respectively added to two designed computer-generated hologram (CGH) displayed on each half of the spatial light modulator (SLM)
A comparison of the results reconstructed by digital holography (DH) and those measured by the charge-coupled device (CCD) camera shows good agreement, except for the difference in shape
Summary
It is well known that photons carry linear momentum and angular momentum (AM)[1]. It enables the study of the structure and propagation characteristics of generated beams, such as their intensities, phases, and OAM density distributions.
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