Article
Optics
Siyu Liu, Yunzhe Yang, Junjie Li, Miaomiao Tang
Summary: This study investigates the second-order statistics of an asymmetric Schell-model beam propagating in atmospheric turbulence with a non-Kolmogorov power spectrum. Numerical examples show that lateral shifted beam patterns can be achieved by adjusting the phase function of complex degree of coherence (CDC). The source coherence modulation on intensity shapes is suppressed by medium fluctuations in the far fields, while the asymmetric beam profiles are maintained for any propagation distances. The degree of coherence in the far fields depends not only on the strength of the turbulence, but also on the source coherence properties.
Article
Engineering, Electrical & Electronic
S. Chib, L. Dalil-Essakali, A. Belafhal
Summary: This paper introduces a planar optical Schell-model source correlation function for a Bessel-modulated Gaussian Schell-model beam (QBGSMB) with quadratic radial dependence. The spectral density of QBGSMB propagating through a paraxial ABCD optical system in atmospheric turbulence is derived. The impact of the source parameters and turbulence strength on the behavior of the diffracted beam is investigated through numerical examples. The results indicate that the beam profile widens and the beam intensity becomes weaker as the atmosphere becomes more turbulent.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Quantum Science & Technology
Zheng-Da Hu, Shuang Zhai, Jicheng Wang, Yun Zhu, Yixin Zhang
Summary: The study investigates the distributions of tripartite quantum information in a non-Kolmogorov turbulent atmosphere and introduces exactly computable measures for tripartite discord-like correlation and tripartite coherence. The decay of tripartite quantum information is found to be qualitatively distinct from that of bipartite quantum information, and is almost insensitive to the outer scale parameter while being slowed down by a larger inner scale parameter.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Hanghang Zhang, Zhiwei Cui, Yiping Han, Jirong Guo, Chao Chang
Summary: The study analyzes the propagation characteristics of a Hermite-Gaussian correlated Schell-model (HGCSM) beam in biological tissue turbulence, investigating factors such as beam orders and coherence width. It was found that the larger the beam orders and fractal dimension, or the smaller the coherence width, the better the beam quality in turbulence. Additionally, HGCSM beams are less affected by turbulence compared to Gaussian Schell-model beams.
FRONTIERS IN PHYSICS
(2021)
Article
Optics
Xiaolu Ma, Guiqiu Wang, Haiyang Zhong, Yaochuan Wang, Dajun Liu
Summary: A new theoretical model for off-axis multi-Gaussian Schell-model hollow vortex beam is introduced in this study, and the evolution properties of the beam in different environments are analyzed. It is found that the flatness of the beam and the effective beam size can be controlled by choosing appropriate source parameters.
Article
Environmental Sciences
Fazhi Wang, Wenhe Du, Qi Yuan, Daosen Liu, Shuang Feng
Summary: This study proposes models for refractive-index fluctuations in the free troposphere and stratosphere non-Kolmogorov turbulence, and derives the corresponding displacement variances based on the Markov approximation. The combined impacts of three-layer atmospheric turbulence on laser beam wander in satellite-ground laser communication are investigated, providing a theoretical model for understanding this phenomenon.
Article
Multidisciplinary Sciences
Xu Wu, Xiaolong Mao, Kenan Wu
Summary: The beam spreading, spectral degree of coherence, and intensity profile evolution of partially coherent Lorentz-Gaussian elliptical multi-Gaussian correlation Schell-Model beams propagating in anisotropic atmospheric turbulence were studied. Analytical expressions for the cross-spectral density function and root mean square beam width were derived. As the propagation distance increases, the elliptical beam first evolves into a Gaussian beam and then returns to an elliptical beam. In anisotropic atmospheric turbulence, the inner scale of turbulence has a greater impact on the spectral degree of coherence and beam width than the outer scale. Lorentz-Gaussian elliptical multi-Gaussian correlated Schell-Model beams exhibit better propagation performance in anisotropic atmospheric turbulence with a larger anisotropic factor and smaller inner scale.
Article
Multidisciplinary Sciences
Xu Wu, Chuang Wang, Yuhui Kong, Kenan Wu
Summary: This study investigates the beam spreading and evolution behavior of a partially coherent, Hermite-cosine-Gaussian (HcosG) rectangular multi-Gaussian correlated Schell-model beam propagating in oceanic turbulence. Analytical expressions for the cross-spectral density function, root mean square (rms) beam width, and spectral degree of coherence are derived. The HcosG rectangular multi-Gaussian correlated Schell model beam exhibits a multi-lobe pattern at short propagation distances, and its propagation performance is influenced by different factors such as displacement parameters and turbulent kinetic energy dissipation rate per unit mass of fluid.
Letter
Optics
Jialu Zhao, Guiqiu Wang, Xiaolu Ma, Haiyang Zhong, Hongming Yin, Yaochuan Wang, Dajun Liu
Summary: The theoretical descriptions for a radial phase-locked multi-Gaussian Schell-model vortex beam array are presented, and the normalized intensity and coherence distributions are analyzed when propagating in free space and atmospheric turbulence. The results suggest that a larger total number or smaller coherence length can lead to better flatness in the beam array at longer distances, but atmospheric turbulence may affect this flatness. Additionally, the coherence distribution of the beam array in atmospheric turbulence at longer distances will have a Gaussian distribution.
Article
Optics
Zhou Yu, Wenhai Wang, Donghui Yang, Zhengda Hu, Yun Zhu
Summary: Contrary to previous assumptions, turbulence cells in optical communication display anisotropic tilt angles, which complexity the environment. We investigate the effects of different angles on communication and find that certain angles can mitigate the disturbance of turbulence on the detection probability of OAM states. In slant paths, the variability in turbulence cells' scales with altitude and the parameters of the Kummer beam significantly impact the received signal. Our findings have practical implications for wireless optical communication systems.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
H. Nabil, M. Bayraktar, A. Balhamri, A. Belafhal
Summary: In this study, the propagation properties of partially coherent Laguerre-Gaussian Schell model vortex beams in jet engine exhaust are investigated using the generalized Huygens-Fresnel principle. The results show that the spectral density of the beam can change shape as the source coherence varies, with a transition from a dark hollow profile to two spot beams at short propagation distances. The spreading of the beam is influenced by the initial parameters, source coherence width, mode order, and wavelength. The findings of this study have potential applications in the design of optical systems for aircrafts.
Article
Optics
S. R. Lekshmi, Dinesh N. Naik, C. S. Narayanamurthy
Summary: This study explores the impact of dynamic Kolmogorov turbulence on Gaussian-Schell model beams in different coherence regimes. The laboratory-level analysis quantitatively verifies the propagation characteristics of these turbulence-affected beams by calculating beam wandering, scintillation index, and Zernike polynomials. Experimental results confirm that Gaussian-Schell model beams are more resilient to turbulence compared to fully coherent beams under different turbulence strengths. These findings have implications for free-space optical communications.
JOURNAL OF MODERN OPTICS
(2023)
Article
Optics
Yuyan Wang, Zhangrong Mei, Jixian Wang, Yonghua Mao, Ming Zhang
Summary: This paper introduces a class of random sources with complex multi-Gaussian coherence states, which produce square flat-topped beams with transverse self-shifting properties. The beams generated by such sources are termed complex coherent square Gaussian Schell-model beams (GSM). Analytic propagating formulas for these beams in isotropic random medium are derived, and the numerical evolution of their statistical characteristics in linear medium is illustrated. The influence of turbulence parameters on beam propagation properties is emphasized.
Correction
Engineering, Electrical & Electronic
Yuqiu Zhang, Tianyue Hou, Qi Chang, Hongxiang Chang, Jinhu Long, Pengfei Ma, Pu Zhou
Summary: This sentence states that the author corrected a few typographical errors in the original manuscript.
IEEE PHOTONICS JOURNAL
(2022)
Article
Environmental Sciences
Wei Wen, Xianwu Mi, Sirui Chen
Summary: This study investigates a universal formula for the beam quality factor of a partially coherent Airy (PCA) beam in non-Kolmogorov turbulence. Numerical simulation results show that expanding the internal scales of non-Kolmogorov turbulence is beneficial for reducing the beam quality factor of a PCA beam. Another advantage is that reducing the quality factor also leads to a decrease in the generalized structure constant and the outer scales of non-Kolmogorov turbulence. Additionally, the quality factor decreases as the transverse scale of the PCA beam increases. Furthermore, decreasing the coherence length of the laser beam results in the degeneration of the quality factor. Moreover, the beam quality factor reaches its maximum value when the generalized exponent parameter of the turbulence is 3.1.
Article
Optics
Yucheng Yang, Teng Wu, Jingbiao Chen, Xiang Peng, Hong Guo
Summary: The study introduces and demonstrates an all-optical single-species Cs atomic comagnetometer, which measures the spin precession frequencies of atoms in two hyperfine levels simultaneously, with significant suppression of systematic errors induced by magnetic field gradients and pump light. The comagnetometer has the potential to be applied in searches for exotic spin-dependent interactions with further optimization.
APPLIED PHYSICS B-LASERS AND OPTICS
(2021)
Article
Physics, Multidisciplinary
A. Tikan, J. Riemensberger, K. Komagata, S. Honl, M. Churaev, C. Skehan, H. Guo, R. N. Wang, J. Liu, P. Seidler, T. J. Kippenberg
Summary: Recent studies have shown that strongly coupled photonic microresonators exhibit emergent nonlinear phenomena, which can be understood by incorporating interactions in the theoretical description of nonlinear optical systems.
Article
Chemistry, Applied
Xin Tong, Guoqiang You, Fanjin Yao, Mahmoud Ebrahimi, Xinyue Deng, Shokouh Attarilar
Summary: The segregation behavior of Mg-Gd alloy was investigated, and it was found that there was uneven distribution of Gd content in the ingots fabricated through resistance heating. The combined application of induction heating and mechanical stirring was able to improve the distribution homogeneity of Gd atoms.
JOURNAL OF RARE EARTHS
(2022)
Article
Materials Science, Multidisciplinary
Wencai Liu, Hongjie Liu, Xin Tong, Dehao Meng, Song Pang, Lv Xiao, Longkang Jiang, Guohua Wu
Summary: The mechanical properties and fracture behavior of magnesium-rare earth (Mg-RE) sand castings were studied. It was found that the T6 treatment can improve the strength and deformation resistance of the alloy, and the initiation and propagation of cracks vary under different load conditions.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Optics
Di Xia, Yufei Huang, Bin Zhang, Pingyang Zeng, Jiaxin Zhao, Zelin Yang, Suwan Sun, Liyang Luo, Guiying Hu, Dong Liu, Zifu Wang, Yufei Li, Hairun Guo, Zhaohui Li
Summary: Research has shown that photonic engineered Raman lasers based on chip-integrated chalcogenide microresonators have high nonlinearity, wide transparency, and low loss. By tuning the dispersion of the chalcogenide microresonator, both single-mode Raman lasing and a broadband Raman-Kerr comb have been demonstrated, showcasing a gap-free tuning range over 140 nm.
LASER & PHOTONICS REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Xin Tong, Guohua Wu, Mark A. Easton, Ming Sun, David H. StJohn, Rui Jiang, Fangzhou Qi
Summary: The distribution of Zr in a commercial Mg-30Zr master alloy can be modified through tungsten inert gas arc re-melting with ultra-high frequency pulses, leading to a substantial reduction in grain size. The approach allows for refinement of Zr particle size and obtaining higher contents of soluble Zr and nanoscale Zr particles. This new method proposes a new approach to the design and fabrication of high-efficiency grain refiners.
SCRIPTA MATERIALIA
(2022)
Article
Optics
Di Xia, Zelin Yang, Pingyang Zeng, Bin Zhang, Jiayue Wu, Zifu Wang, Jiaxin Zhao, Jianteng Huang, Liyang Luo, Dong Liu, Shuixian Yang, Hairun Guo, Zhaohui Li
Summary: Integrated nonlinear photonics, with favorable optical materials, provide a potential platform for highly compact and high-intensity nonlinear interactions. In this work, a newly developed chalcogenide glass-Ge25Sb10S65 (GeSbS) is presented for nonlinear photonic integration and dissipative soliton microcomb generation. Chip-integrated optical microresonators with lithographically controlled dispersion engineering are implemented to generate both bright soliton-based and dark-pulse combs.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
T. uo l Iu, S. uwan s Un, S. iyu w Ang, Y. ongyuan c Hu, H. airun g Uo
Summary: This study demonstrates soliton microcombs with broadband and dispersive intermode interactions in homedeveloped magnesium fluoride microresonators. The authors observed comb states with broadband spectral tailoring effect via an intermode pumping scheme, and identified footprints of both constructive and destructive interference on the comb spectrum.
PHOTONICS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Hongjie Liu, Jia Ma, Wencai Liu, Guohua Wu, Jiawei Sun, Xin Tong, Peijun Chen
Summary: The feasibility of TIG welding of as-cast Mg-8Li-3Al-2Zn-0.5Y alloys was investigated in this study. The results showed that the welded joints had good formability and improved mechanical properties, making it suitable for welding Mg-Li alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Analytical
Xinpeng Chen, Suwan Sun, Weizhu Ji, Xingxing Ding, You Gao, Tuo Liu, Jianxiang Wen, Hairun Guo, Tingyun Wang
Summary: Researchers have demonstrated a combined technique to access power-sufficient optical microcombs by using a photonic-integrated soliton microcomb and home-developed erbium-doped gain fiber. This method provides sufficient optical power for applications such as telecommunications.
Article
Materials Science, Multidisciplinary
Yixiao Wang, Guohua Wu, Liang Zhang, Xin Tong, Liangbin Li, Xunman Xiong, Xiaolong Zhang, Cunlong Wang
Summary: This study compared the precipitation behavior of sand-cast Al-Li alloy under different quenching conditions and discussed the effect of quenching rates on the formation mechanisms of precipitates. It was found that rapid quenching facilitated the precipitation and refinement of precipitates, leading to improved mechanical properties. Furthermore, the alloy was found to have a lower quench sensitivity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Optics
Zhichao Ye, Haiyan Jia, Zhangjun Huang, Chen Shen, Jinbao Long, Baoqi Shi, Yi-Han Luo, Lan Gao, Wei Sun, Hairun Guo, Jijun He, Junqiu Liu
Summary: The foundry development of integrated photonics has revolutionized optical interconnect and datacenters. Silicon nitride (Si3N4) integrated photonics has become the leading platform for linear and Kerr nonlinear photonics, offering low optical loss and ultra-low noise chip-scale lasers. However, challenges remain in transferring these processes to CMOS foundries operating with larger wafers.
PHOTONICS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Youjie Guo, Liang Zhang, Guohua Wu, Yixiao Wang, Fangzhou Qi, Xuanxi Xu, Xin Tong, Peisen Li, Guangxiao Ren, Yingjing Geng, Liangbin Li, Xunman Xiong
Summary: This study investigates the effect of Li addition on the hot-tearing susceptibility (HTS) of Al-Cu-Li alloys and finds that the experimental results are consistent with the predictions when Li content is below 2.5 wt pct. However, high Li-containing alloys show abnormally severe HTS due to the formation of Li-rich oxide inclusions, which obstruct liquid feeding.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Xin Tong, Guohua Wu, Ming Sun, Qiman Wang, Liang Zhang, Wencai Liu
Summary: In this study, the purification and grain refinement of Mg-9Gd-3Y alloy were successfully achieved simultaneously by one-step refining at a high temperature, using a self-developed compound flux. A physical model was proposed to explain the interactions between the flux and the alloy melt, and the mechanism of grain refinement was analyzed. The generated RECl3 was found to enhance the purification efficacy and improve the ductility of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Nanoscience & Nanotechnology
Yan Wu, Jianxiang Wen, Fengzai Tang, Fufei Pang, Hairun Guo, Sujuan Huang, Tingyun Wang
Summary: In this study, we developed a model of interaction between photons and electrons in an active vortex field, which can generate a fluorescence spectrum with the characteristics of orbital angular momentum. We experimentally demonstrated the emission of broad-spectrum fluorescence with OAM features in a ring-core erbium-doped fiber, and successfully identified the spiral-shaped interferograms of OAM modes.
