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Author

Fang Wang

Bio: Fang Wang is an academic researcher from Soochow University (Suzhou). The author has contributed to research in topics: Laser beam quality & Coherence (physics). The author has an hindex of 2, co-authored 3 publications receiving 27 citations.

Papers
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Journal ArticleDOI
Yahong Chen1, Fang Wang1, Jiayi Yu1, Lin Liu1, Yangjian Cai1 
TL;DR: The behaviors of a vector HGCSM beam on propagation are quite different from those of a conventional vector partially coherent beam with uniform SOP or non-uniform SOP, and modulating the structures of the correlation functions cannot only modulate the intensity distribution, but also the state of polarization, the degree of polarization and the polarization singularities of a partially coherent vector beam on propagate.
Abstract: A new kind of partially coherent vector beam named vector Hermite-Gaussian correlated Schell-model (HGCSM) beam is introduced as a natural extension of recently introduced scalar HGCSM beam. The realizability and beam conditions for a vector HGCSM beam with uniform state of polarization (SOP) or non-uniform SOP are derived, respectively. Furthermore, analytical formulae for a vector HGCSM beam propagating in free space are derived, and the propagation properties of a vector HGCSM beam with uniform SOP or non-uniform SOP in free space are studied and analyzed in detail. We find that the behaviors of a vector HGCSM beam on propagation are quite different from those of a conventional vector partially coherent beam with uniform SOP or non-uniform SOP, and modulating the structures of the correlation functions cannot only modulate the intensity distribution, but also the state of polarization, the degree of polarization and the polarization singularities of a partially coherent vector beam on propagation. Furthermore, we report experimental generation of a radially polarized HGCSM beam for the first time. Our results provide a novel way for polarization modulation.

26 citations

Journal ArticleDOI
Fang Wang1, Yahong Chen1, Lina Guo, Lin Liu1, Yangjian Cai1 
TL;DR: The recently introduced complex Gaussian function is adopted to expand the partially coherent beams with nonconventional degrees of coherence, and it is found that the uniaxial crystal can be used to control the splitting properties of a Hermite-Gaussian correlated Schell-model beam.
Abstract: We adopt the recently introduced complex Gaussian function to expand the partially coherent beams with nonconventional degrees of coherence, and derive detailed representations of Hermite–Gaussian correlated Schell-model beam, elliptical Laguerre–Gaussian correlated Schell-model beam, and multi-Gaussian correlated Schell-model beam. Complex Gaussian representation of a partially coherent beam provides a convenient way for treating its propagation. As an application example, we explore the self-splitting properties of a Hermite–Gaussian correlated Schell-model beam propagating in a uniaxial crystal with the help of the complex Gaussian representation, and it is found that the uniaxial crystal can be used to control the splitting properties.

5 citations

Proceedings ArticleDOI
Fang Wang1, Qingjia Zhou1, Yahong Chen1, Lin Liu1, Yangjian Cai1 
01 Nov 2017
TL;DR: In this paper, the authors introduced a new model of partially coherent light pulse called a Hermite-Gaussian correlated Schell-model (HGCSM) pulse in temporal domain.
Abstract: Enlighted by the partially coherent beam with nonconventional correlation functions in spatial domain, we introduced a new model of partially coherent light pulse called a Hermite-Gaussian correlated Schell-model (HGCSM) pulse in temporal domain. The analytical expression of the mutual coherence function of the HGCSM pulse propagating in a second-order dispersive media has been derived. The statistical properties, such as the intensity distribution and the temporal degree of coherence the spectral degree of coherence of a HGCSM pulse in dispersive media are illustrated numerically. It is demonstrated that the velocity of beam splitting can be manipulated by controlling the incident pulse duration, the initial temporal coherence length, the beam order m and the dispersion of the medium. It is also shown that the oscillations in the temporal degree of coherence profiles gradually intensify with increasing pulse duration of the incident pulse and beam order. With increasing second-order dispersion coefficient β2 and temporal coherence length of the incident pulse, the profiles of the temporal degree of coherence move towards the large value.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a planar Pancharatnam-berry (PB) phase element was proposed to replace all the elements required to obtain the perfect vortex beam for integrated optical communication and micromanipulation systems.
Abstract: Perfect vortex beams are the orbital angular momentum (OAM)-carrying beams with fixed annular intensities, which provide a better source of OAM than traditional Laguerre-Gaussian beams. However, ordinary schemes to obtain the perfect vortex beams are usually bulky and unstable. We demonstrate here a novel generation scheme by designing planar Pancharatnam-Berry (PB) phase elements to replace all the elements required. Different from the conventional approaches based on reflective or refractive elements, PB phase elements can dramatically reduce the occupying volume of system. Moreover, the PB phase element scheme is easily developed to produce the perfect vector beams. Therefore, our scheme may provide prominent vortex and vector sources for integrated optical communication and micromanipulation systems.

112 citations

Book ChapterDOI
Yangjian Cai1, Yahong Chen1, Jiayi Yu1, Xianlong Liu1, Lin Liu1 
TL;DR: Partially coherent beams with a prescribed phase, state of polarization, and degree of coherence display many extraordinary propagation properties and are preferred in many applications, such as particle trapping, free-space optical communications, remote sensing, optical imaging, material thermal processing, image transformation, and optical encryption as discussed by the authors.
Abstract: Partially coherent beams with a prescribed phase, state of polarization, and degree of coherence display many extraordinary propagation properties and are preferred in many applications, such as particle trapping, free-space optical communications, remote sensing, optical imaging, material thermal processing, image transformation, and optical encryption. In this review, we begin with describing conventional Gaussian Schell-model beams and partially coherent beams with prescribed phases, states of polarization, and degrees of coherence. Then we introduce theoretical models for various partially coherent beams and the methods for generating them. Finally, a brief summary is presented.

104 citations

Journal ArticleDOI
TL;DR: In this article, the authors report experimental generation and measurement of recently introduced optical coherence lattices and show theoretically that information can be encoded into and, in principle, recovered from the lattice degree of coherence.
Abstract: We report experimental generation and measurement of recently introduced optical coherence lattices. The presented optical coherence lattice realization technique hinges on a superposition of mutually uncorrelated partially coherent Schell-model beams with tailored coherence properties. We show theoretically that information can be encoded into and, in principle, recovered from the lattice degree of coherence. Our results can find applications to image transmission and optical encryption.

68 citations

Journal ArticleDOI
TL;DR: In this article, the authors control both shape and coherence using liquid-crystal spatial light modulators, and can produce two different classes of PCBs using the same simple optical setup.
Abstract: Partially coherent beams (PCBs) of light can be highly directional, as from lasers, yet resistant to speckle and scintillation, as from LEDs. Generating PCBs with separate optical components for beam shaping and spatial coherence is complicated, and fundamentally limited. The authors control both shape and coherence using liquid-crystal spatial light modulators, and can produce two different classes of PCBs using the same simple optical setup. This work is immediately applicable in such diverse fields as medicine, directed energy, free-space optical communication, and manufacturing.

51 citations

Journal ArticleDOI
TL;DR: It is shown that self-steering partially coherent vector optical beams have mobile guiding centers of their intensity and polarization state distributions on the beam free space propagation that could be employed to generate far-field polarization arrays.
Abstract: We introduce a class of self-steering partially coherent vector optical beams with the aid of a generalized complex Gaussian representation. We show that such partially coherent vector beams have mobile guiding centers of their intensity and polarization state distributions on the beam free space propagation that could be employed to generate far-field polarization arrays. Further, we introduce theoretically and realize experimentally a class of vector beams with inhomogeneous statistical and nontrivial far-field angular distributions, which we term cylindrically correlated partially coherent (CCPC) vector beams. We find that such novel beams possess, in general, cylindrically polarized, far-field patterns of an adjustable degree of polarization. The steering control of the intensity and polarization of the self-steering CCPC vector beam is also demonstrated in experiment. Our findings can find important applications, such as trapping of neutral microparticles and excitation of novel surface waves.

34 citations