The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Dongmei Deng - One of the best experts on this subject based on the ideXlab platform.
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propagation properties of the rotating elliptical chirped gaussian beam in uniaxial crystals orthogonal to the Optical Axis
Waves in Random and Complex Media, 2020Co-Authors: Jianbin Zhang, Jintao Xie, Dongmei DengAbstract:An analytical expression of the rotating elliptical chirped Gaussian (RECG) beam in uniaxial crystals orthogonal to the Optical Axis has been derived. The uniaxial crystals considered here are the ...
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propagation of the first order annular bessel gaussian beams in a uniaxial crystal along the Optical Axis governed by the pockels effect
Optics Express, 2020Co-Authors: Yuanqiang Peng, Dongmei Deng, Huixin Qiu, Kaihui Chen, Xiangbo YangAbstract:We investigate the first order annular Bessel Gaussian beams propagating in a strontium barium niobate (SBN) crystal governed by the Pockels effect. The left-hand circularly polarized incident waves propagating along the Optical Axis in the crystal give rise to the right-hand circularly polarized vortex fields with a topological charge of 2. If an external dc field is applied along the Optical Axis of the SBN crystal, the anisotropy strength can be controlled rapidly, and the rotational invariance around the Optical Axis is still maintained. In this case, the normalized intensity in the focal region, the power exchange between left-hand and right-hand components, and the exchange between the spin and orbit contributions of the angular momentum flux can be manipulated. We also consider the case where the incident waves are linearly polarized along the x Axis. The cylindrical symmetry of two Cartesian components is broken during propagation due to the anisotropy, and the intensity distribution as well as the polarization state of the beams can be regulated electrically.
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propagation of the radially polarized airy vortex beams in uniaxial crystals orthogonal to the Optical Axis
Journal of The Optical Society of America A-optics Image Science and Vision, 2019Co-Authors: Qian Yang, Dongmei Deng, Wenzheng Zhu, Xinpeng Chen, Lanqiu HuangAbstract:We introduce the radially polarized Airy vortex beams (RPAiVBs) and analytically study their propagation in uniaxial crystals orthogonal to the Optical Axis. We mainly discuss the effects of the vortex and the ratio of the extraordinary index (ne) to the ordinary index (no) on the propagation properties of the RPAiVBs involving the intensity distributions, the maximum intensity, the radiation forces, the trajectory, and the velocity. The RPAiVBs evolve into the beams produced by the x direction electric field (RPAiXVB) and the y direction electric field (RPAiYVB). It is shown that with the increase in the order of the vortex, the maximum intensity and the radiation forces of the RPAiVBs are greatly enhanced; besides, the intensity focusing position of the RPAiVBs is farther. Furthermore, with the ratio of ne to no increasing, the trajectory of the RPAiXVBs is farther from x=0 mm, and the acceleration is bigger in the x–z plane, but they are opposite in the y–z plane.
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paraxial propagation of radially polarized first order chirped airy guassian beams in uniaxial crystals orthogonal to the Optical Axis
Applied Physics B, 2019Co-Authors: Jintao Xie, Dongmei DengAbstract:We have studied the propagation of radially polarized first-order chirped Airy Guassian beams (RPCAiGBs) in uniaxial crystals orthogonal to the Optical Axis. The intensity distribution, the maximum intensity, the propagation trajectory and velocity of the beams in different view planes are investigated in this paper. We find that for the x component (RPCAiGXBs) and the y component (RPCAiGYBs) of the RPCAiGBs, the intensity first propagates along the x and y directions, respectively. Later, the intensity of these two components flows into the side lobes along the x direction. We also examine the effects on the trajectory, the velocity and the focused performance of the RPCAiGBs caused by the distribution factor (\(\chi _0\)), the first-order chirp parameter (\(\beta \)) and the ratio of the extraordinary refractive index (\(n_\mathrm{e}\)) to the ordinary refractive index (\(n_\mathrm{o}\)) (\(n_\mathrm{e}/n_\mathrm{o}\)). Thus, by choosing appropriate \(\chi _0\), \(n_\mathrm{e}/n_\mathrm{o}\) and \(\beta \), we are able to adjust these characteristics.
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paraxial propagation dynamics of the radially polarized airy beams in uniaxial crystals orthogonal to the Optical Axis
Optics Express, 2018Co-Authors: Jintao Xie, Jianbin Zhang, Xitao Zheng, Dongmei DengAbstract:We study the paraxial propagation of the radially polarized Airy beams (RPAiBs) in uniaxial crystals orthogonal to the Optical Axis analytically and numerically. The propagation trajectory, the intensity and the radiation forces of the RPAiBs are investigated and the properties are elucidated by numerical examples in this paper. Results show that the RPAiBs evolve into the beams produced by the x-direction electric field (RPAiXBs) and the y-direction electric field (PRAiYBs) which are totally different in uniaxial crystals. During the propagation, the intensity of the RPAiXBs transfers from the side lobe in the x-direction to the main lobe and finally returns to the side lobe in the x-direction again, but that of the RPAiYBs transfers from the side lobe in the y-direction to the main lobe and flows to the side lobe in the x-direction at last. The effect of the intensity focusing for the RPAiXBs can be modulated by the ratio of the extraordinary index (ne) to the ordinary index (no) in anisotropic medium, which contributes to the intensity focusing of the RPAiBs in a short distance a lot. We can adjust the intensity distribution especially the focusing position, the propagation trajectory and the radiation forces distributions of the RPAiXBs through choosing an appropriate value of the ratio of ne to no to meet the actual usage accordingly.
Guoquan Zhou - One of the best experts on this subject based on the ideXlab platform.
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propagation of cosh airy beams in uniaxial crystals orthogonal to the Optical Axis
Optics and Laser Technology, 2019Co-Authors: Guoquan Zhou, Ruipin Chen, Xiuxiang ChuAbstract:Abstract Analytical Optical field of a cosh-Airy beam propagating in uniaxial crystals orthogonal to the Optical Axis is presented. Analytical expressions of the centre of gravity, the beam spot size, and the linear momentum for the cosh-Airy beam in uniaxial crystals are also derived, respectively. The propagation properties of a cosh-Airy beam are numerically demonstrated in the uniaxial crystal. The cosh-Airy beam still has the feature of self-acceleration in the two transverse directions. However, the cosh-Airy beam in the y-direction accelerates more slowly than that in the x-direction. The centre of gravity and the beam spot size in the y-direction are always less than those in the x-direction. The influence of the uniaxial crystal on the intensity distribution, the phase distribution, the centre of gravity, the beam spot size, and the linear momentum of a cosh-Airy beam is investigated. The effect of the cosh part on the centre of gravity, the beam spot size, and the linear momentum is also studied in detail. The centre of gravity of the cosh-Airy beam is less than that of the corresponding Airy beam. However, the beam spot size and the linear momentum of the cosh-Airy beam are larger than those of the corresponding Airy beam.
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nonparaxial analysis in the propagation of a cylindrical vector laguerre gaussian beam in a uniaxial crystal orthogonal to the Optical Axis
Optics Communications, 2013Co-Authors: Yimin Zhou, Xiaogang Wang, Xiuxiang Chu, Chaoqing Dai, Guoquan ZhouAbstract:Abstract Analytical expressions for the three components of the nonparaxial propagation of cylindrical vector Laguerre–Gaussian beams with two cases in a uniaxial crystal orthogonal to the Optical Axis are derived, respectively. The distributions of the intensities and the degrees of the polarization of cylindrical vector Laguerre–Gaussian beams with two cases propagating in a uniaxial crystal orthogonal to the Optical Axis are demonstrated by numerical examples. The beam profiles of the x - and y -components with the second case are somewhat similar to those of the x - and y -components with the first case rotating π /2. However, the beam profile of the longitudinal component with the second case is completely different from that of the longitudinal component with the first case. The degrees of the polarization of cylindrical vector Laguerre–Gaussian beams with the two cases take on different distribution. The uniaxial crystal can modulate the distributions of the intensity and the degree of the polarization for a cylindrical vector Laguerre–Gaussian beam, which is beneficial to the Optical trapping and nonlinear optics involving in the special beam profile.
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nonparaxial propagation of hermite laguerre gaussian beams in uniaxial crystal orthogonal to the Optical Axis
Chinese Physics B, 2013Co-Authors: Guoquan Zhou, Xiaogang WangAbstract:Analytical expressions for the three components of the nonparaxial propagation of a Hermite—Laguerre—Gaussian (HLG) beam in uniaxial crystal orthogonal to the Optical Axis are derived. The intensity distribution of an HLG beam and its three components propagating in a uniaxial crystal orthogonal to the Optical Axis are demonstrated by numerical examples. Although the y and z components of an HLG beam in the incident plane are both equal to zero, they emerge upon propagation inside the uniaxial crystal. Moreover, the beam profile of the x component is relatively stable and the beam profiles of the y and z components have the same evolution law. If the ratio of the extraordinary refractive index to the ordinary refractive index is larger than unity, the beam profile of the HLG beam is elongated in the x direction and generally rotates clockwise. Otherwise, the beam profile of the HLG beam is elongated in the y direction and generally rotates anticlockwise. This research is beneficial to the Optical trapping and nonlinear optics involved in the rotation of a beam profile.
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nonparaxial propagation of lorentz gauss vortex beams in uniaxial crystals orthogonal to the Optical Axis
Applied Physics B, 2012Co-Authors: Guoquan ZhouAbstract:Analytical expressions for the components of the nonparaxial propagation a Lorentz-Gauss vortex beam in uniaxial crystals orthogonal to the Optical Axis are derived. The intensity and the phase distributions of the components of a Lorentz-Gauss vortex beam propagating in a uniaxial crystal orthogonal to the Optical Axis are shown by numerical examples. Even though one of the two transversal components of a Lorentz-Gauss vortex beam in the source plane is equal to zero, it emerges upon propagation inside the uniaxial crystal. Moreover, the beam profile of a Lorentz-Gauss vortex beam in the uniaxial crystal becomes twisted and tilted. The three components are completely different and have their respective evolution laws. The intensity distribution and the phase distribution of a Lorentz-Gauss vortex beam can be modulated by the uniaxial crystal, which is beneficial to the Optical trapping and nonlinear optics involving in the special beam profile.
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nonparaxial propagation of an elegant laguerre gaussian beam orthogonal to the Optical Axis of a uniaxial crystal
Optics Express, 2012Co-Authors: Guoquan ZhouAbstract:Analytical expressions of the nonparaxial propagation of even and odd elegant Laguerre-Gaussian beams orthogonal to the Optical Axis of a uniaxial crystal are derived. The intensity distributions of even and odd elegant Laguerre-Gaussian beams and their three components propagating in uniaxial crystals orthogonal to the Optical Axis are illustrated by numerical examples. Even though one of the two transversal components of even and odd elegant Laguerre-Gaussian beams in the input plane is set to be zero, this transversal and the longitudinal components have nonzero intensities and cannot be neglected upon propagation inside the uniaxial crystal. The evolution laws of even and odd elegant Laguerre-Gaussian beams propagating in uniaxial crystals orthogonal to the Optical Axis are also demonstrated. The intensity distributions of even and odd elegant Laguerre-Gaussian beams can be modulated by the uniaxial crystal, which is beneficial to the some applications involving in the special beam profile.
Dajun Liu - One of the best experts on this subject based on the ideXlab platform.
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propagation properties of a partially coherent anomalous hollow vortex beam in uniaxial crystal orthogonal to the Optical Axis
Journal of Modern Optics, 2018Co-Authors: Dajun Liu, Yaochuan Wang, Guiqiu Wang, Hongming YinAbstract:AbstractThe concept of a partially coherent anomalous hollow vortex beam generated by a Schell-model source was introduced in this paper. Next, the analytical expressions of a partially coherent anomalous hollow vortex beam propagating in a uniaxial crystal orthogonal to the Optical Axis were derived, and the evolution properties of a partially coherent anomalous hollow vortex beam propagating in a uniaxial crystal were illustrated using numerical examples. Finally, the influences of the uniaxial crystal and the beam parameters on the spreading properties of partially coherent anomalous hollow vortex beam were analysed in detail.
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propagation properties of a partially coherent lorentz beam in uniaxial crystal orthogonal to the Optical Axis
Journal of The Optical Society of America A-optics Image Science and Vision, 2017Co-Authors: Dajun Liu, Guiqiu Wang, Hongming Yin, Yaochuan WangAbstract:The cross-spectral density function of a partially coherent Lorentz beam propagating in uniaxial crystal orthogonal to the Optical Axis is obtained, and the evolution properties and the spectral degree of coherence for a partially coherent Lorentz beam in uniaxial crystal are illustrated by using numerical examples. The influence of coherence length and the ratio of refractive index ne/no on the normalized intensity and spectral degree of coherence for a partially coherent Lorentz beam are analyzed in detail.
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propagation properties of flat topped vortex hollow beam in uniaxial crystals orthogonal to the Optical Axis
Optik, 2016Co-Authors: Dajun Liu, Yaochuan Wang, Guiqiu Wang, Hongming YinAbstract:Abstract The analytical expressions of a flat-topped vortex hollow beam propagating in uniaxial crystals orthogonal to the Optical Axis are obtained. The evolution properties of intensity and phase for flat-topped vortex hollow beam are discussed by using the numerical examples in detail. It is found that the beam order N, topological charge M and the ratio of refractive index n e / n o of uniaxial crystals will influent the beam intensity and phase distributions.
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propagation properties of elliptical gaussian beam in uniaxial crystals along the Optical Axis
Optics and Laser Technology, 2015Co-Authors: Dajun Liu, He Wang, Yaochuan Wang, Hongming YinAbstract:Abstract Based on the paraxial vectorial theory of beams propagating in uniaxial anisotropic crystal, we have derived the analytical propagation equations of elliptical Gaussian beam in uniaxial crystal along the Optical Axis, and given the typical numerical example to illustrate our analytical results. It is found that the x-polarized Gaussian beams split into an ordinary beam and an extraordinary beam, which independently propagate along the Optical Axis, and the elliptical Gaussian beam loses its initial profile with the propagation distance increasing.
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generalized formulas for electromagnetic beams on inverse propagation through uniaxial crystals orthogonal to the Optical Axis
Optik, 2013Co-Authors: Dajun Liu, He Wang, Zhongxiang Zhou, Yaochuan Wang, Guiqiu WangAbstract:Abstract Based on the Fourier transform and the inverse Fourier transform, generalized formulas for the electromagnetic beams on inverse propagation through uniaxial crystals orthogonal to the Optical Axis are derived. As an example, we apply the derived formulas to the inverse source problem of stochastic electromagnetic beams propagating through uniaxial crystals orthogonal to the Optical Axis.
Zhongxiang Zhou - One of the best experts on this subject based on the ideXlab platform.
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generalized formulas for electromagnetic beams on inverse propagation through uniaxial crystals orthogonal to the Optical Axis
Optik, 2013Co-Authors: Dajun Liu, He Wang, Zhongxiang Zhou, Yaochuan Wang, Guiqiu WangAbstract:Abstract Based on the Fourier transform and the inverse Fourier transform, generalized formulas for the electromagnetic beams on inverse propagation through uniaxial crystals orthogonal to the Optical Axis are derived. As an example, we apply the derived formulas to the inverse source problem of stochastic electromagnetic beams propagating through uniaxial crystals orthogonal to the Optical Axis.
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propagation and the kurtosis parameter of gaussian flat topped beams in uniaxial crystals orthogonal to the Optical Axis
Optics and Lasers in Engineering, 2010Co-Authors: Dajun Liu, Zhongxiang ZhouAbstract:Abstract The analytical formulae for the Gaussian flat-topped beams propagating in uniaxial crystals orthogonal to the Optical Axis are derived. The numerical results show that the Gaussian flat-topped beams spread at different rates in the directions parallel and orthogonal to the Optical Axis due to anisotropic crystals. An analytical expression for the kurtosis parameter of the Gaussian flat-topped beams propagating in uniaxial crystals is derived and illustrated with numerical examples. It is shown that the evolution of the kurtosis parameters K x and K y depend on the ratio of extraordinary to ordinary refractive indices.
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propagation properties of anomalous hollow beam in uniaxial crystals orthogonal to the Optical Axis
Optics and Laser Technology, 2009Co-Authors: Dajun Liu, Zhongxiang ZhouAbstract:Abstract The analytical formulae for anomalous hollow beam propagating in uniaxial crystals orthogonal to the Optical Axis are derived. The numerical results show that the anomalous hollow beam spreads at different rates in the directions along and orthogonal to the Optical Axis. The beam spreads more rapidly in the direction along the Optical Axis than orthogonal to the Optical Axis in positive crystal (ne/no>1), and the beam spreads more rapidly in the direction orthogonal to the Optical Axis than along the Optical Axis in negative crystal (ne/no
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propagation of partially coherent flat topped beams in uniaxial crystals orthogonal to the Optical Axis
Journal of The Optical Society of America A-optics Image Science and Vision, 2009Co-Authors: Dajun Liu, Zhongxiang ZhouAbstract:The propagation of partially coherent flat-topped beams in uniaxial crystals orthogonal to the Optical Axis is investigated. Analytical propagation formulas for partially coherent flat-topped beams propagating through uniaxial crystals orthogonal to the Optical Axis are derived and some analyses are illustrated by numerical examples related to the propagation properties of partially coherent circular flat-topped beams. It is found that the propagation properties of partially coherent flat-topped beams in uniaxial crystals are closely related to the initial coherence and the ratio of extraordinary and ordinary refractive indices.
Zhangrong Mei - One of the best experts on this subject based on the ideXlab platform.
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propagation properties of the rectangular multi gaussian schell model beams in uniaxial crystals orthogonal to the Optical Axis
IEEE Photonics Journal, 2017Co-Authors: Yonghua Mao, Zhangrong MeiAbstract:A stochastic beam generated by a recently introduced source of Schell type with rectangular multi-Gaussian spectral degree of coherence is shown to posses interesting novel features on propagation in uniaxial crystals. The analytical expression for the cross-spectral density function of the rectangular multi-Gaussian Schell-model (RMGSM) beams propagating in uniaxial crystals orthogonal to the Optical Axis is derived. With the help of the derived formula, the evolution properties of the spectral density, the effective beam width, and the spectral degree of coherence of the RMGSM beams in a uniaxial crystal are investigated in detail. It is shown that the evolution properties of an RMGSM beam in uniaxial crystal are much different from its evolution properties in free space, and the propagation properties of the RMGSM beams in uniaxial crystals are closely related to the initial beam parameters (beam index M and spatial coherence length) and the parameters of the uniaxial crystals (the ratio of extraordinary and ordinary refractive indices). The results demonstrate the potential of uniaxial crystals for modulating the properties of the RMGSM beams.
