Adaptive optimisation of a generalised phase contrast beam shaping system

Kenny, Fiona; Choi, Fung Sing; Glückstad, Jesper; Booth, Martin J.

doi:10.1016/j.optcom.2014.12.059

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…In this work, the experimental principle includes three main issues: the design of the double-ring phase-aperture, the diffraction theory for phase element, and the coherent combination between the vortex beam and Gaussian beam 19 – 21 …”

Section: Principlementioning

confidence: 99%

Characteristics of a Gaussian focus embedded within spiral patterns in common-path interferometry with phase apertures

Tan

2023

Adv. Photon. Nexus

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A phase-only method is proposed to transform an optical vortex field into desired spiral diffractioninterference patterns. Double-ring phase apertures are designed to produce a concentric high-order vortex beam and a zeroth-order vortex beam, and the diffracted intensity ratio of two beams is adjustable between 0 and 1. The coherent superposition of the two diffracted beams generates a brighter Airy spot (or Poisson spot) in the middle of the spiral pattern, where the singularity for typical vortex beam is located. Experiments employing circular, triangular, and rectangular phase apertures with topological charges from 3 to 16 demonstrate a stable, compact, and flexible apparatus for vortex beam conversion. By adjusting the parameters of the phase aperture, the proposed method can realize the optical Gaussian tweezer function and the optical vortex tweezer function simultaneously along the same axis or switch the experimental setup between the two functions. It also has potential applications in light communication through turbulent air by transmitting an orbital angular momentum-coded signal with a concentric beacon laser.

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Section: Principlementioning

confidence: 99%

Characteristics of a Gaussian focus embedded within spiral patterns in common-path interferometry with phase apertures

Tan

2023

Adv. Photon. Nexus

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“…Although our demonstrations are designed for speci c wavelengths and input beam sizes, implementations that allow more input freedom, have also been demonstrated recently [78,79] and were achieved with an adaptive PCF. Hybrid light shaping techniques where the ltering plane is on an SLM would also bene t from having a tunable PCF.…”

Section: Gpc Experimental Demonstrationsmentioning

confidence: 99%

Light Shaping with Holography, GPC and Holo-GPC

Bañas¹,

Glückstad²

2017

Optical Data Processing and Storage

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Light shaping techniques based on phase-only modulation o er multiple advantages over amplitude modulation. This review examines and compares the merits of two phase modulation techniques; phase-only computer generated holography and Generalized Phase Contrast (GPC). Both techniques are brie y presented while recent developments in GPC will also be covered. Furthermore, novel hybrid schemes that inherit merits from both holography and GPC are also covered. In particular, our most recent technique coined "Holo-GPC" will be discussed in addition to earlier hybrid techniques. We will discuss how Holo-GPC utilizes the simplicity of GPC in forming well-de ned speckle-free shapes and the versatility of holography in distributing these shaped beams over an extended 3D volume. To conclude, we cite applications where the combined strengths of the two photon-e cient phase-only light shaping techniques open new possibilities.

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“…(8) can lead to possible further optimization of the CPI, although this is beyond the scope of this Communication. With the use of a dynamic PCF, by using a SLM for example [29], A can be adjusted so that matched amplitude is still achieved. However, this presents a drawback in possible losses in the system and a more complex implementation.…”

mentioning

confidence: 99%

Interferometric detection of OAM-carrying Helico-conical beams

Engay

Bañas

Bunea

et al. 2019

Optics Communications

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Helico-conical beams (HCBs) are a class of orbital angular momentum (OAM)-carrying beams with spiral phase and intensity profiles. In this communication, we demonstrate the use of a common path interferometer (CPI) to phase-image incoming HCBs and directly detect their OAM-associated properties. The output intensity of the CPI is a direct mapping of the HCB's phase, hence both the topological charge value and sign manifest in the output intensity distribution. The topological charge value is calculated by fringe counting, while the helicity is determined by observing the intensity along the region. With our current CPI setup, we can firmly detect up to l = 20. Higher values of l lead to a decrease in the fringe visibility, but this can in principle be improved by tailoring the parameters of the phase contrast filter (PCF) employed in the CPI. We present analytical expressions to optimize the CPI for HCB charge detection.

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Adaptive optimisation of a generalised phase contrast beam shaping system

Cited by 5 publications

References 24 publications

Characteristics of a Gaussian focus embedded within spiral patterns in common-path interferometry with phase apertures

Characteristics of a Gaussian focus embedded within spiral patterns in common-path interferometry with phase apertures

Light Shaping with Holography, GPC and Holo-GPC

Interferometric detection of OAM-carrying Helico-conical beams

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