Detection of phase singularity using a lateral shear interferometer

Ghai, Devinder Pal; Vyas, Sunil; Senthilkumaran, P.; Sirohi, R. S.

doi:10.1016/j.optlaseng.2008.02.001

Cited by 61 publications

(21 citation statements)

References 23 publications

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“…However, a priori knowledge of beam parameters of both the test and reference wave is essential to obtain unambiguous results, particularly sign of the topological charge. Recently, we have reported a self referencing technique based on lateral shearing for detection of phase singularity and determination of its topological charge [22]. In this technique, the test wavefront is amplitude split and laterally sheared to generate its displaced replica.…”

Section: Introductionmentioning

confidence: 99%

Single-slit diffraction of an optical beam with phase singularity

Ghai

Senthilkumaran

Sirohi

2009

Optics and Lasers in Engineering

Self Cite

137

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Section: Introductionmentioning

confidence: 99%

Single-slit diffraction of an optical beam with phase singularity

Ghai

Senthilkumaran

Sirohi

2009

Optics and Lasers in Engineering

Self Cite

137

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“…The OAM properties of OVs are actively being studied because of their many applications, such as free space telecommunications [2], mode division multiplexing in a fiber [3,4] optical micro-and nanomanipulation [5,6,7], astronomy [8] and many others. Since measurement of the TC is the common There are a variety of methods for measuring the TC of OVs; some are based on interferometry [9,10,11], others use an annular [12] or triangular aperture [13]. Methods based on the property of multi-singular optical vortices to deform in the presence of some astigmatic media are particularly relevant to experimental use because of their extreme simplicity.…”

Section: Introductionmentioning

confidence: 99%

Detection of mixed OAM states via vortex breakup

2017

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We study the tilted lens technique for measuring the topological charge (TC) of an optical vortex and investigate how this technique works for optical vortices in mixed orbital angular momentum states (i.e. when one beam contains several components with different values of TC). We present experimental results and theoretical simulations for the measurement of the TC of mixed states. We investigate two different cases: when coherent interference (or addition) between components is present and when it is absent (incoherent addition). We discover that this technique is suitable for measuring the TC of the dominant component of a mixed state.

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“…The vortex beam interferes with a plane or spherical beam, resulting in the formation of fork or spiral fringes, which roughly show their locations and topological charges. This method has been optimized for high‐resolution localization of phase singularities below the wavelength and simplified by a lateral shear interferometer . However, when the vortex field is too weak to form interference fringes, this method fails.…”

Section: Introductionmentioning

confidence: 99%

Revealing optical vortices with a small number of photons

Zhang

Wang

et al. 2016

Laser & Photonics Reviews

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Detecting the optical vortices of darkness hidden in an ultra-weak background is a difficult task. Here we report an experiment demonstrating that the optical vortices can be directly visualized and identified with a smaller number of photons. Our method is based on the extension of the spiral phase contrast technique to incorporate vortex phase plates (VPP) of high-order topological charges. In our experiment, we prepare optical vortex arrays of interesting structures such as Arabic numerals and the wings carrying various topological charges. By placing various VPP filters in the Fourier plane of a 4f imaging system, the embedded vortices of an incident ultra-weak light field can be visualized, revealing both their positions and topological charges. It is found that a higher order vortex generally requires a smaller number of photons to be detected. Our method may find potential application in the fields of astronomical optics and biosensing in an ultra-weak light environment.

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Detection of phase singularity using a lateral shear interferometer

Cited by 61 publications

References 23 publications

Single-slit diffraction of an optical beam with phase singularity

Single-slit diffraction of an optical beam with phase singularity

Detection of mixed OAM states via vortex breakup

Revealing optical vortices with a small number of photons

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