Generation of fractional ellipse perfect vector beams

Gu, Feng Yan; Li, Lin; Chang, Chen Liang; Cao, Yuan; Feng, Shao Tong; Nie, Shou Ping; Ding, Jianping

doi:10.1016/j.optcom.2019.03.023

Cited by 11 publications

(2 citation statements)

References 31 publications

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“…Compared to scalar vortex, vector vortex is more convenient to achieve isotropic and anisotropic conversion, and most importantly, part of the shadow can be eliminated through the polarizer. Vector light beams can be generated by orthogonal base vector superposition [72][73][74][75][76][77] or geometric phase devices [78][79][80][81]. In the edge enhancement, geometric devices such as Q-plate [82] and S wave plate [35] are usually used.…”

Section: Image Edge Enhancement Based On Vector Vortex Filteringmentioning

confidence: 99%

Implementing the edge enhancement with vortex filter in both linear and nonlinear optics

Xu,

Zhang

2023

Front. Phys.

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The edge enhancement technique, as an effective method to represent the boundary of objects, plays an important role in image processing. Among them, the vortex filtering, which is based on the radial Hilbert transformation, has been paid great attention due to its ability to achieve isotropic and anisotropic edge enhancement. Recent years have witnessed a growing interest in the nonlinear vortex filter to skillfully realize the visualization of the object edge under invisible light irradiation. In this paper, we start from reviewing the achievements have been made with the vortex filtering technique in linear optics, and then discussed the recent processes of the scalar and vector vortex filter in nonlinear optics. We hope that the nonlinear optical vortex filter can motivate some promising applications in biological edge imaging with visible light-sensitive specimens.

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Section: Image Edge Enhancement Based On Vector Vortex Filteringmentioning

confidence: 99%

Implementing the edge enhancement with vortex filter in both linear and nonlinear optics

Xu,

Zhang

2023

Front. Phys.

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“…The most commonly used method for creating the PVB is Fourier transformation of the Bessel vortex beam [19][20][21], which is usually replaced by a BG vortex beam in reality. Here, the BG vortex beam is usually created by a computer-controlled liquid-crystal spatial light modulator (SLM) [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] or digital micromirror device (DMD) [35], a special designed hybrid phase plate [36], a transparent variable diffractive spiral axicon based on a single liquid-crystal cell [37], polymer-based phase plate [38], metasurface [39], Pancharatnam-Berry phase element [40], axicon [41][42][43], or diffraction of the BG vortex beam by using curved fork grating [44], and so on. In addition, the PVB can be directly generated by schemes including a computer-generated hologram (CGH) displayed on the reflective phase SLM [45][46][47][48] or the DMD [49,50], a radial phase shift spiral zone plate [51,52], a planar Pancharatnam-Berry (PB) phase element [53], or metasurfaces [54][55][56][57]…”

Section: Introductionmentioning

confidence: 99%

Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width

Tao,

Liang,

Zhang

et al. 2023

Photonics

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We have experimentally created perfect vortex beams (PVBs) by Fourier transformation of Bessel–Gaussian vortex beams, which are generated by modulating the fundamental Gaussian beam with the spiral phase plates and the axicons, respectively. Although the method has been used many times by other authors, as far as we know, few people pay attention to the quantitative relationship between the control parameters of the PVB and ring width. The effects of the waist radius of the fundamental Gaussian beam wg, base angle of the axicon γ, and focal length of the lens f on the spot parameters (ring radius ρ, and ring half-width Δ) of PVB are systematically studied. The beam pattern of the generated Bessel–Gaussian beam for different propagation distances behind the axicon and the fundamental Gaussian beam wg is presented. We showed experimentally that the ring radius ρ increases linearly with the increase of the base angle γ and focal length f, while the ring half-width Δ decreases with the increase of the fundamental beam waist radius wg, and increases with enlarging the focal length f. We confirmed the topological charge (TC) of the PVB by the interferogram between the PVB and the reference fundamental Gaussian beam. We also studied experimentally that the size of the generated PVB in the Fourier plane is independent of the TCs. Our approach to generate the PVB has the advantages of high-power tolerance and high efficiency.

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