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Chinese Journal of Lasers B
中国激光医学杂志
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高功率激光及等离子体物理研究论文集(专题)
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Matter and Radiation at Extremes
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International Journal of Extreme Manufacturing
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Journal of Semiconductors

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Reviews
摘要
Cylindrical vector beams and vortex beams, two types of typical singular optical beams characterized by axially symmetric polarization and helical phase front, possess the unique focusing property and the ability of carrying orbital angular momentum. We discuss the formation mechanisms of such singular beams in few-mode fibers under the vortex basis and show recent advances in generating techniques that are mainly based on long-period fiber gratings, mode-selective couplers, offset-spliced fibers, and tapered fibers. The performances of cylindrical vector beams and vortex beams generated in fibers and fiber lasers are summarized and compared to give a comprehensive understanding of singular beams and to promote their practical applications.
Advanced Photonics
2021, 3(1): 014002
Letters
摘要
Nonlinear holography has been identified as a vital platform for optical multiplexing holography because of the appearance of new optical frequencies. However, due to nonlinear wave coupling in nonlinear optical processes, the nonlinear harmonic field is coupled with the input field, laying a fundamental barrier to independent control of the interacting fields for holography. We propose and experimentally demonstrate high-dimensional orbital angular momentum (OAM) multiplexing nonlinear holography to overcome this problem. By dividing the wavefront of the fundamental wave into different orthogonal OAM channels, multiple OAM and polarization-dependent holographic images in both the fundamental wave and second-harmonic wave have been reconstructed independently in the spatial frequency domain through a type-II second harmonic generation process. Moreover, this method can be easily extended to cascaded χ2 nonlinear optical processes for multiplexing in more wavelength channels, leading to potential applications in multicasting in optical communications, multiwavelength display, multidimensional optical storage, anticounterfeiting, and optical encryption.
Advanced Photonics
2021, 3(1): 015001
Early Posting
摘要
We propose a design of single-mode orbital angular momentum (OAM) beam laser with high direct-modulation bandwidth. It’s a microcylinder/microring cavity interacted with two types of second-order gratings: the complex top grating containing the real part and the imaginary part modulation and the side grating. The side grating etched on the periphery of the microcylinder/microring cavity can select a whispering gallery mode with a specific azimuthal mode number. While the complex top gratings can scatter the lasing mode with travelling-wave pattern vertically. With the cooperation of the gratings, the laser works with a single mode and emits radially polarized OAM beams. With an asymmetrical pad metal on the top of the cavity, the OAM on-chip laser can firstly be directly modulated with electrical pumping. Due to the small active volume, the laser with low threshold current is predicted to have a high direct modulation bandwidth about 29 GHz with the bias current of ten times the threshold from the simulation. The semiconductor OAM laser can be rather easily realized at different wavelengths such as the O band, C band and L band.
Chinese Optics Letters
2021, 19(8):
Special Issue on Lithium Niobate Based Photonic Devices
摘要
Based on nonlinear wave mixing, we experimentally propose a scheme for directly generating optical orbital angular momentum (OAM) by a spirally structured fundamental wave interacting with a nonlinear medium, in which the nonlinear susceptibilities are homogenous. In the experiment, the second-harmonic generation of a fundamental wave carrying positive (negative) integers and fractional OAM states was investigated. This study presents a convenient approach for dynamic control of OAM of vortex beams, which may feature their applications in optical manipulation and optical communication.
Chinese Optics Letters
2021, 19(6): 060005
Physical Optics
摘要
The evolution of the spin density vectors (SDVs) is studied in a strongly focused composite field. It is found that the SDVs can be spiral along the propagation axis, and they are perpendicular to the ys direction on the ys axis. This behavior is governed by the Gouy phase difference between the field polarization components. The 60° rotation of the spatial distribution of the transverse SDVs is also generated, which is found to be controlled by the Gouy phase difference between the field orbital angular momentum modes. Additionally, the spin density singularities are observed in the evolution of the SDVs.
Chinese Optics Letters
2021, 19(2): 022601
Early Posting
摘要
Orbital angular momentum (OAM) is a fundamental physical characteristic to describe laser fields with a spiral phase structure. Vortex beams carrying OAMs have attracted more and more attention in recent years. However, the wavefront of OAM light would be destroyed when it passes through scattering media. Here, based on the feedback-based wavefront shaping method, we reconstitute OAM wavefront behind strong scattering media. The intensity of light with desired OAM states is enhanced to 150 times. This study provides a method to manipulate OAMs of scattered light, and is of great significance for OAM optical communication and imaging to overcome complex environment interference.
Chinese Optics Letters
2021, 19(10):
综述
摘要
涡旋光束具有携带轨道角动量的独特性质,在光学操纵、光学通信、量子光学等领域具有广阔的应用前景。将时域调控技术与涡旋光束相结合产生超短涡旋脉冲,对于极端强场条件下的物理实验研究以及超快非线性光谱、精密激光材料的加工等领域的研究具有重要意义。对近年来国内外超短涡旋脉冲产生方法的研究进展进行了调研,综述了超短涡旋脉冲的主要产生方法,并对各个方法的优势与不足进行了对比分析。
激光与光电子学进展
2020, 57(5): 050008
光纤光学与光通信
袁苑  孔德鹏  贺正权  王丽莉  
收起
摘要
基于全矢量有限元法,研究了聚合物中空环芯光纤结构的椭圆、偏芯、直径不均匀等几何形变对光纤中轨道角动量模式性能的影响;此外,还研究了在保持轨道角动量模式稳定传输的条件下,光纤结构所能承受的最大形变.结果表明椭圆和偏芯会引起轨道角动量模式在传输过程中发生奇偶模间的模式走离,导致轨道角动量模式纯度降低,进而导致模式串扰增大;数值计算结果表明,当椭圆度或偏心度小于1%时,模式纯度大于99.02%,串扰小于-20.08 dB.光纤的直径不均匀仅对光纤中所能支持的轨道角动量模式数量造成影响,纤芯半径越大,光纤中所能传输的轨道角动量模式越多;直径不均匀度在-3%~10%内的光纤均可支持原有的26个轨道角动量模式.
光子学报
2020, 49(6): 0606002
综述
杨伟东  邱晓东  陈理想  
收起
摘要
光不仅可以携带自旋角动量,还可以携带轨道角动量。其中,自旋角动量与光波的圆偏振态有关,而轨道角动量来源于光波的螺旋相位结构。自Allen等1992年首次理论确认了光子轨道角动量的物理概念和内涵以来,这类具有特殊螺旋相位波前的新型光场吸引了越来越多的研究兴趣,在经典光学及量子光学领域均展示出了诸多重要的应用前景。本文从基础物理及应用物理两个层面出发,着重介绍了轨道角动量光束的制备与探测技术,特别是近年来轨道角动量调控在螺旋相衬成像技术、远程旋转多普勒效应探测技术及光学微操控技术等领域的研究进展。
中国激光
2020, 47(5): 0500013
量子光学
摘要
针对基于指示单光子源的测量设备无关量子密钥分配协议存在基的依赖性问题和信源统计波动问题,研究了基于服从泊松分布的指示单光子源和轨道角动量的量子密钥分配协议,并进行了统计波动分析。分析了对称信道和非对称信道下,该协议的单边传输效率、密钥生成速率与安全传输距离的关系,模拟了信源的统计波动对该协议密钥生成速率和传输距离的影响。仿真结果表明,应用轨道角动量编码解决了该协议基的依赖性问题,提高了密钥生成速率和安全传输距离。统计波动对该协议密钥生成速率的影响随着传输距离的增大而扩大,在脉冲数量相同时,非对称信道下的密钥生成速率、安全传输距离大于对称信道下的。
中国激光
2020, 47(4): 0412001
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