scholarly journals Observation of optical vortex knots and links associated with topological charge

2021 ◽  
Author(s):  
JINZHAN ZHONG ◽  
Sheng Liu ◽  
xuyue guo ◽  
Peng Li ◽  
Bingyan Wei ◽  
...  
Keyword(s):  
Topological Charge ◽  
Optical Vortex ◽  
Knots And Links

scholarly journals Supercontinuum optical vortex pulse generation without spatial or topological-charge dispersion

2009 ◽  
Vol 17 (17) ◽  
pp. 14517 ◽  
Author(s):  
Yu Tokizane ◽  
Kazuhiko Oka ◽  
Ryuji Morita
Keyword(s):  
Topological Charge ◽  
Optical Vortex ◽  
Pulse Generation

scholarly journals Mie scattering distinguishes the topological charge of an optical vortex: a homage to Gustav Mie

2009 ◽  
Vol 11 (1) ◽  
pp. 013046 ◽  
Author(s):  
Valeria Garbin ◽  
Giovanni Volpe ◽  
Enrico Ferrari ◽  
Michel Versluis ◽  
Dan Cojoc ◽  
...  
Keyword(s):  
Topological Charge ◽  
Optical Vortex ◽  
Mie Scattering

scholarly journals DETERMINATION OF AN OPTICAL VORTEX TOPOLOGICAL CHARGE USING AN ASTIGMATIC TRANSFORM

2016 ◽  
Vol 40 (6) ◽  
pp. 781-792 ◽  
Author(s):  
V. V. Kotlyar ◽  
A. A. Kovalev ◽  
A. P. Porfirev
Keyword(s):  
Topological Charge ◽  
Optical Vortex

Topological Charge in Situ Measuring of Perfect Optical Vortex

2019 ◽  
Vol 48 (7) ◽  
pp. 726001
Author(s):  
任斐斐 REN Fei-fei ◽  
梁言生 LIANG Yan-sheng ◽  
蔡亚楠 CAI Ya-nan ◽  
何旻儒 HE Min-ru ◽  
雷铭 LEI Ming ◽  
...  
Keyword(s):  
Topological Charge ◽  
Optical Vortex

scholarly journals Topological Charge Detection Using Generalized Contour-Sum Method from Distorted Donut-Shaped Optical Vortex Beams: Experimental Comparison of Closed Path Determination Methods

2019 ◽  
Vol 9 (19) ◽  
pp. 3956
Author(s):  
Wang ◽  
Huang ◽  
Toyoda ◽  
Liu
Keyword(s):  
Topological Charge ◽  
Circle Method ◽  
Transformation Method ◽  
Optical Vortex ◽  
Experimental Comparison ◽  
Average Intensity ◽  
Closed Path ◽  
Light Modulator ◽  
Watershed Transformation ◽  
Determination Methods

A generalized contour-sum method has been proposed to measure the topological charge (TC) of an optical vortex (OV) beam using a Shack–Hartmann wavefront sensor (SH-WFS). Moreover, a recent study extended it to be workable for measuring an aberrated OV beam. However, when the OV beam suffers from severe distortion, the closed path for circulation calculation becomes crucial. In this paper, we evaluate the performance of five closed path determination methods, including watershed transformation, maximum average-intensity circle extraction, a combination of watershed transformation and maximum average-intensity circle extraction, and perfectly round circles assignation. In the experiments, we used a phase-only spatial light modulator to generate OV beams and aberrations, while an SH-WFS was used to measure the intensity profile and phase slopes. The results show that when determining the TC values of distorted donut-shaped OV beams, the watershed-transformed maximum average-intensity circle method performed the best, and the maximum average-intensity circle method and the watershed transformation method came second and third, while the worst was the perfect circles assignation method. The discussions that explain our experimental results are also given.

Evolution of an optical vortex with an initial fractional topological charge

2020 ◽  
Vol 102 (2) ◽  
Author(s):  
V. V. Kotlyar ◽  
A. A. Kovalev ◽  
A. G. Nalimov ◽  
A. P. Porfirev
Keyword(s):  
Topological Charge ◽  
Optical Vortex

Astigmatic transforms of an optical vortex for measurement of its topological charge

2017 ◽  
Vol 56 (14) ◽  
pp. 4095 ◽  
Author(s):  
Victor V. Kotlyar ◽  
Alexey A. Kovalev ◽  
Alexey P. Porfirev
Keyword(s):  
Topological Charge ◽  
Optical Vortex
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