Article(id=1319954961069355452, tenantId=1146029695717560320, journalId=1278651732997652489, issueId=1319954807939515170, articleNumber=null, orderNo=null, doi=10.12086/oee.2026.260103, pmid=null, cstr=32245.14.oee.2026.260103, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1777305600000, receivedDateStr=2026-04-28, revisedDate=1781712000000, revisedDateStr=2026-06-18, acceptedDate=1782057600000, acceptedDateStr=2026-06-22, onlineDate=1792631386295, onlineDateStr=2026-10-22, pubDate=1784908800000, pubDateStr=2026-07-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792631386295, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792631386295, creator=13701087609, updateTime=1792631386295, updator=13701087609, issue=Issue{id=1319954807939515170, tenantId=1146029695717560320, journalId=1278651732997652489, year='2026', volume='53', issue='7', pageStart='250354', pageEnd='1', issueExtLink='null', onlineDate='null', pubDate='1784908800000', pubDateStr='2026-07-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1792631349786, creator='13701087609', updateTime=1792720386185, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320328253928222956, tenantId=1146029695717560320, journalId=1278651732997652489, issueId=1319954807939515170, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320328253928222957, tenantId=1146029695717560320, journalId=1278651732997652489, issueId=1319954807939515170, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=260103, endPage=1, ext={EN=ArticleExt(id=1319954961245516221, articleId=1319954961069355452, tenantId=1146029695717560320, journalId=1278651732997652489, language=EN, title=Femtosecond laser fabrication of PB phase collimated beam splitters, columnId=1279511634116841602, journalTitle=Opto-Electronic Engineering, columnName=Article, runingTitle=null, highlight=null, articleAbstract=
Objective Single-layer PB phase metasurfaces, while compact and broadband, face inherent limitations in complex wavefront shaping and arbitrary polarization control. Specifically, they cannot achieve beam translation, which requires spatially separated elements, nor can they independently manipulate the diagonal terms of the Jones matrix, limiting their ability to modulate linear polarization. Multilayer cascaded devices address these issues but often introduce fabrication complexities such as interlayer Fresnel reflections, reduced refractive index contrast, or demanding alignment processes. This study aims to overcome these limitations by leveraging the true three-dimensional direct writing capability of femtosecond laser processing to fabricate a compact, cascaded PB phase beam splitter within a single fused silica substrate. The objective is to realize a device that simultaneously achieves beam splitting, wavefront collimation, and linear-to-linear polarization conversion, all while maintaining high efficiency and robustness for high-power applications.
Methods The proposed device is a three-stage cascaded structure integrated monolithically in fused silica. It consists of two identical PB phase polarization gratings and a quarter-wave plate (QWP). The first PG acts as a beam splitter, diffracting the orthogonal circular polarization components of an incident linear polarization into ±1 orders. The second PG, placed at a distance, acts as a collimator, redirecting these divergent beams back to their original propagation direction. The final QWP converts the circularly polarized outputs back to linear polarization.
A rigorous vector diffraction analysis was first conducted to theoretically evaluate the impact of fabrication errors—specifically, non-uniform retardance and nonlinear azimuthal angle variations—on the diffraction efficiency and polarization state of the ±1, 0, and higher orders. This analysis established strict requirements for the linearity of the azimuthal angle and the uniformity of the retardance across the grating to achieve ideal 50:50 beam splitting with high polarization purity.
To meet these stringent requirements, a dynamic pulse line density compensation strategy was developed to address the polarization-dependent fabrication characteristics inherent in femtosecond laser writing. This method compensates for variations in birefringence strength induced by different laser polarization states during scanning, which arise from spatio-temporal asymmetries like pulse front tilt and angular dispersion introduced by the focusing objective. Instead of modifying the laser’s spatio-temporal profile, this approach dynamically adjusts the pulse line density for each scanning line based on its polarization orientation. This allows for uniform birefringence retardance across the entire device, regardless of the slow-axis orientation, while maintaining low propagation loss. The three-layer structure was fabricated in Corning 7980 fused silica using a 1030 nm femtosecond laser and a low numerical aperture objective. The final device was characterized at a 510 nm operating wavelength.
Results and Discussions The theoretical analysis confirmed that deviations from ideal conditions—a uniform π retardance and a strictly linear azimuthal angle variation across the grating period—lead to severe performance degradation. Such errors cause energy coupling between the ±1 and 0 orders, introduce higher-order diffractions, and degrade the polarization ellipticity of the output beams. The analysis quantitatively showed that azimuthal angle nonlinearity is a primary source of efficiency loss, while non-uniform retardance causes unbalanced energy distribution between the two output beams.
The experimental investigation of the fabrication process revealed a significant polarization-dependent writing effect. Birefringent structures written with laser polarization at 90° (slow axis horizontal) exhibited a lower modification threshold, resulting in wider, longer, and higher-retardance structures compared to those written with 0° polarization. This "aggressive" growth of structures in the preferred polarization direction distorted the designed linear azimuthal angle variation, effectively pulling the orientation of neighboring structures towards the preferred angle. This phenomenon was found to be objective-dependent, with different objectives (5×, 20×, 40×) showing reversed trends, confirming the role of the optical system’s spatio-temporal aberrations.
The dynamic pulse line density compensation was highly effective in mitigating this polarization-dependent non-uniformity. Compared to a non-compensated grating, the compensated grating showed a reduction in normalized retardance deviation from 30%–40% to just 12%. This significantly improved the linearity of the azimuthal angle profile. The fabricated polarization grating, when tested alone, demonstrated remarkable input polarization robustness. For any linear input polarization, the power splitting ratio between the ±1 orders remained above 90.69%, with the device operating at its design state (90° linear input) achieving a 97.01% splitting ratio and a total diffraction efficiency of 94.8%, far exceeding the ~81% of conventional binary optics.
The complete three-stage collimated beam splitter exhibited excellent performance. The output beams showed a measured separation angle of 0.16 mrad, closely matching the theoretical design, indicating successful collimation. The final output beams were linear with a high splitting ratio of 94.01% and a polarization angle difference of only 3.3°. The device also demonstrated outstanding power handling capability, maintaining a stable ~83% efficiency under 3.6 W of continuous 510 nm laser irradiation over 2400 seconds, with a calculated power tolerance exceeding 52.67 W/cm2.
Conclusions This work successfully demonstrates a new paradigm for fabricating multifunctional PB phase devices by leveraging the true three-dimensional capability of femtosecond laser direct writing. A cascaded PB phase collimated beam splitter was integrated into a single fused silica substrate, overcoming the wavefront shaping and polarization modulation limitations of single-layer devices. The critical challenge of polarization-dependent writing non-uniformity was effectively addressed by a novel dynamic pulse line density compensation method, which is more practical than complex optical path compensation. This approach enabled precise control over the retardance and azimuthal angle distributions, yielding a high-performance device with a splitting ratio of 94.01%, an inter-beam angle of 0.16 mrad, a polarization angle difference of 3.3°, and high-power tolerance. This work paves a robust and scalable way for creating compact, high-performance, and damage-resistant integrated photonic elements for applications such as high-power laser parallel processing, atomic electric field sensing, and advanced beam manipulation systems.
, authors=Yuexiao Yan, Renhao Xing, Zezheng Li, authorsList=Yuexiao Yan, Renhao Xing, Zezheng Li, authorCompany=null, correspAuthors=Zezheng Li, authorNote=null, correspAuthorsNote=
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单层的几何相位器件在光束复杂波前的整形与偏振态的任意操控上存在局限性,限制了其在复杂应用场景中的工作效果。本文利用飞秒激光直写技术成功制备了几何相位准直分束器,提出在一块熔融石英基底上分两端写入由两级几何相位偏振光栅与一级波片的级联器件构型,理论分析了偏振光栅双折射延迟量与方位角排布对各衍射级次效率和偏振的影响,并在后续的加工中使用动态脉冲线密度工艺补偿了各个偏振直写双折射结构的延迟量差异,显著抑制了偏振光栅加工误差对分束比的影响,实现了510 nm工作波长线偏振输入到线偏振输出的准直光束二等分。器件同时实现光束的波前横向平移与几何相位器件的线偏振出射,且在设计输入偏振下具有94.01%的分束比,3.3°的偏振方向夹角与0.16 mrad的光束间夹角,同时具备耐物理损伤和高功率耐受特性,在激光并行加工、原子电场探测等领域具有良好应用前景。
, authors=闫跃潇, 邢仁豪, 李泽政
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作者贡献
闫跃潇、邢仁豪:研究资料的收集、分析,实验的设计与完成,论文写作;李泽政:指导论文选题、论文修改。
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闫跃潇 (1997-),男,博士研究生,主要从事飞秒激光微纳光学器件加工研究。E-mail:yx-yan22@mails.tsinghua.edu.cnyx-yan22@mails.tsinghua.edu.cn
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37 (11): 1411−1419., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1319954988114227863, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, xref=null, ext=[AuthorCompanyExt(id=1319954988126810776, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, companyId=1319954988114227863, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Department of Precision Instrument, Tsinghua University, Beijing 100080, China), AuthorCompanyExt(id=1319954988135199385, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, companyId=1319954988114227863, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=清华大学精密仪器系,北京 100080)])], figs=[ArticleFig(id=1319954995663975091, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.1, caption=
Principle of PB phase polarization grating. (a) PB phase introduced by polarization variation; (b) Diffraction orders of PB phase polarization grating, figureFileSmall=VRhlhHqkdnsuzojDM890Gg==, figureFileBig=1cg+qYDVpGg340ZoC1UK4A==, tableContent=null), ArticleFig(id=1319954995781415605, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图1, caption=
几何相位偏振光栅原理。 (a)由偏振变化引入的几何相位; (b)几何相位偏振光栅的衍射级次, figureFileSmall=VRhlhHqkdnsuzojDM890Gg==, figureFileBig=1cg+qYDVpGg340ZoC1UK4A==, tableContent=null), ArticleFig(id=1319954996217623223, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.2, caption=
PB phase collimated beam splitter, figureFileSmall=tjFGySeYgx/JAcMZPlecBA==, figureFileBig=GBsfY8tw3YSszEiHAsDdBQ==, tableContent=null), ArticleFig(id=1319954996305703608, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图2, caption=
几何相位准直分束器, figureFileSmall=tjFGySeYgx/JAcMZPlecBA==, figureFileBig=GBsfY8tw3YSszEiHAsDdBQ==, tableContent=null), ArticleFig(id=1319954996490252985, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.3, caption=
Effects of retardance and azimuth error on the diffraction efficiency and polarization of a grating under linearly polarized input. (a) Effect of retardance error on diffraction efficiency; (b) Effect of azimuth error on diffraction efficiency; (c) Effect of mixed error on diffraction efficiency; (d) Effect of mixed error on output polarization ellipticity, figureFileSmall=Be5TFFRBEpyxs1rOmO5mBg==, figureFileBig=YDbdLXddnNdfWG2eepLayA==, tableContent=null), ArticleFig(id=1319954996595110586, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图3, caption=
偏振光栅延迟量与方位角误差对线偏振输入的光栅衍射效率与偏振影响。 (a)延迟量误差对衍射效率的影响; (b)方位角误差对衍射效率的影响; (c)混合误差对衍射效率的影响; (d)混合误差对偏振椭圆度的影响, figureFileSmall=Be5TFFRBEpyxs1rOmO5mBg==, figureFileBig=YDbdLXddnNdfWG2eepLayA==, tableContent=null), ArticleFig(id=1319954996708356795, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.4, caption=
Schematic diagram of the PB phase elements processing and characterization system. (a) Femtosecond laser direct writing processing system; (b) Birefringence microscope and birefringence images, figureFileSmall=7Ce6vR/oPwKLW5qt892nMg==, figureFileBig=f/cihbdJgd/G8ZCu+6sl5g==, tableContent=null), ArticleFig(id=1319954996813214396, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图4, caption=
几何相位器件加工与表征系统示意图。 (a)飞秒激光直写加工系统; (b)双折射显微镜与双折射成像照片, figureFileSmall=7Ce6vR/oPwKLW5qt892nMg==, figureFileBig=f/cihbdJgd/G8ZCu+6sl5g==, tableContent=null), ArticleFig(id=1319954996897100477, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.5, caption=
Characterization of birefringent structures fabricated by 1030 nm laser processing. (a) Birefringence imaging; (b) Transmission optical microscopy imaging, figureFileSmall=75BxYqyAmJ2j4VR07PkfHA==, figureFileBig=CW9R4F7BQOZgDHKMeQYzTA==, tableContent=null), ArticleFig(id=1319954996955820734, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图5, caption=
飞秒激光加工双折射结构表征。 (a)双折射成像; (b)透射光学显微镜成像, figureFileSmall=75BxYqyAmJ2j4VR07PkfHA==, figureFileBig=CW9R4F7BQOZgDHKMeQYzTA==, tableContent=null), ArticleFig(id=1319954997027123903, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.6, caption=
Multilayer low-loss birefringent grating structure, figureFileSmall=444LHSGLWnrbcEtusERPUw==, figureFileBig=X/whWtUZcsrIdb6o8P0vrA==, tableContent=null), ArticleFig(id=1319954997090038465, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图6, caption=
多层堆叠的低损耗双折射光栅结构, figureFileSmall=444LHSGLWnrbcEtusERPUw==, figureFileBig=X/whWtUZcsrIdb6o8P0vrA==, tableContent=null), ArticleFig(id=1319954997333308098, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.7, caption=
Polarization-dependent fabrication characteristics of birefringent structures. (a) Normalized retardance histogram; (b) Arrangement of azimuth and retardance within a single period; (c) Relationship between azimuth angle variation rate and retardance within a single period; (d) Birefringence characterization of different polarization scanning lines; (e) Cross-sectional structure of different polarization scanning lines, figureFileSmall=rtLV7N+KBzpZTwTni3ghQA==, figureFileBig=bNvByUi4kjhvLP75f7/s1Q==, tableContent=null), ArticleFig(id=1319954997387834051, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图7, caption=
双折射结构的偏振依赖加工特性。 (a)归一化延迟量直方图; (b)单个周期内方位角与延迟量排布; (c)单周期内方位角变化率与延迟量关系; (d)不同偏振扫描线双折射表征; (e)不同偏振扫描线结构剖面, figureFileSmall=rtLV7N+KBzpZTwTni3ghQA==, figureFileBig=bNvByUi4kjhvLP75f7/s1Q==, tableContent=null), ArticleFig(id=1319954997492691652, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.8, caption=
Differences in birefringent scanning lines fabricated with different objective lenses. (a) 5× objective; (b) 20× objective; (c) 40× objective, figureFileSmall=BNf//nyVdfDYhEQQAuSG6A==, figureFileBig=H8KjklvVQcAE0qgY+6VYpg==, tableContent=null), ArticleFig(id=1319954999208161990, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图8, caption=
不同物镜加工双折射扫描线差异。 (a) 5×物镜; (b) 20×物镜; (c) 40×物镜, figureFileSmall=BNf//nyVdfDYhEQQAuSG6A==, figureFileBig=H8KjklvVQcAE0qgY+6VYpg==, tableContent=null), ArticleFig(id=1319954999296242375, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.9, caption=
Comparison of compensation effects of pulse energy and pulse line density. (a) Pulse energy compensation; (b) Pulse line density compensation, figureFileSmall=iVu5br95dYi/JEowXdRfvg==, figureFileBig=nsJgqgYoUDS4X7VFQN9Nuw==, tableContent=null), ArticleFig(id=1319954999367545544, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图9, caption=
脉冲能量与脉冲线密度补偿效果对照。 (a)脉冲能量补偿; (b)脉冲线密度补偿, figureFileSmall=iVu5br95dYi/JEowXdRfvg==, figureFileBig=nsJgqgYoUDS4X7VFQN9Nuw==, tableContent=null), ArticleFig(id=1319954999443043017, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.10, caption=
Birefringence characteristics of gratings fabricated with dynamic pulse line density. (a) Birefringence grayscale image; (b) Birefringence pseudocolor image; (c) Arrangement of normalized retardance and azimuth angle within a single period; (d) Normalized retardance histogram, figureFileSmall=CN3NfzhjydS+I1SR3mVoQQ==, figureFileBig=6usB0XLVnIKljkENyLQmeA==, tableContent=null), ArticleFig(id=1319954999522734794, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图10, caption=
动态参数加工的光栅双折射特性。 (a)双折射灰度图;(b)双折射伪彩色图;(c)单周期内归一化延迟量与方位角排布;(d)归一化延迟量直方图, figureFileSmall=CN3NfzhjydS+I1SR3mVoQQ==, figureFileBig=6usB0XLVnIKljkENyLQmeA==, tableContent=null), ArticleFig(id=1319954999606620875, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.11, caption=
Fabrication process of PB phase collimated beam splitters by femtosecond laser direct writing. (a) Fabrication of the polarization grating for the beam-splitting stage; (b) Fabrication of the polarization grating for the collimation stage; (c) Fabrication of the quarter-wave plate, figureFileSmall=i2o/nEqsROfzRli00u+f7w==, figureFileBig=HrUIsw4kazmc1WMdp43N6w==, tableContent=null), ArticleFig(id=1319954999686312652, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图11, caption=
几何相位准直分束器的飞秒激光直写加工流程。 (a)分束级偏振光栅加工; (b)准直级偏振光栅加工; (c)四分之一波片加工, figureFileSmall=i2o/nEqsROfzRli00u+f7w==, figureFileBig=HrUIsw4kazmc1WMdp43N6w==, tableContent=null), ArticleFig(id=1319954999766004429, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.12, caption=
Output characteristics of PB phase polarization gratings under different polarization inputs. (a) Elliptically polarized input; (b) Linearly polarized input, figureFileSmall=tETijro95P0ILzayeze5SQ==, figureFileBig=H3fORUBx9bdDJy93rnKcXQ==, tableContent=null), ArticleFig(id=1319954999824724686, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图12, caption=
几何相位偏振光栅的不同偏振输入的输出特性。 (a)椭圆偏振输入;(b)线偏振输入, figureFileSmall=tETijro95P0ILzayeze5SQ==, figureFileBig=H3fORUBx9bdDJy93rnKcXQ==, tableContent=null), ArticleFig(id=1319954999887639247, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.13, caption=
Diffraction field of a PB phase collimated beam splitter, figureFileSmall=BzEz3prdQ0TWei5hi4owVQ==, figureFileBig=rX9XA07MbqewFiOULfg5hA==, tableContent=null), ArticleFig(id=1319954999967331024, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图13, caption=
几何相位衍射准直分束器的衍射光场, figureFileSmall=BzEz3prdQ0TWei5hi4owVQ==, figureFileBig=rX9XA07MbqewFiOULfg5hA==, tableContent=null), ArticleFig(id=1319955000034439889, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=EN, label=Fig.14, caption=
Power tolerance test of a PB phase collimated beam splitter, figureFileSmall=nisPp+mVlooR8Kr1STF1tw==, figureFileBig=zim3qNZkFgLVI8BAS96BRQ==, tableContent=null), ArticleFig(id=1319955000122520274, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1319954961069355452, language=CN, label=图14, caption=
几何相位准直分束器功率耐受测试, figureFileSmall=nisPp+mVlooR8Kr1STF1tw==, figureFileBig=zim3qNZkFgLVI8BAS96BRQ==, tableContent=null)], attaches=null, journal=Journal(id=1278641367198941188, delFlag=0, nameCn=光电工程, nameEn=Opto-Electronic Engineering, nameHistory1=null, nameHistory2=null, issn=1003-501X, eissn=2097-4019, cn=51-1346/O4, coden=null, periodic=0, language=CN, oaType=null, ccby=null, superviseOffice=null, ownerOffice=null, pubOffice=null, editorOffice=null, officeType=null, aims=null, clcCode=null, officeProv=null, officeCity=null, officeAddr=null, officeZip=null, officeEmail=null, officePhone=null, editDirector=null, officeDirector=null, officeDirectorPhone=null, officeStaffNum=null, officeEmpNum=null, coverPicUrl=4Vimkd+qXLWNxtdpr9mFNw==, journalPrice=null, startedYear=null, abbrevIsoEn=Opto-Electronic Engineering, journalRemark=null, publicationField=null, createdTime=1782781457950, updatedTime=1784021784694, createdBy=18614031015, updatedBy=13041195026, firstLetterCn=G, firstLetterEn=G, 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