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Compensation method for performance degradation of optically addressed spatial light modulator induced by CW laser

high Power Laser science and engineering 2022年第1期10卷 64-75页

作者： Tongyao Du Dajie Huang He Cheng Wei Fan Zhibo Xing Xuechun Li Jianqiang Zhu Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026China National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

In this paper,we propose an effective method to compensate for the performance degradation of optically addressed spatial light modulators(OASLMs).The thermal deposition problem usually leads to the on-off ratio reduction of amplitude OASLM,so it is difficult to achieve better results in high-power laser *** the analysis of the laser-induced temperature rise model and the liquid crystal layer voltage model,it is found that reducing the driving voltage of the liquid crystal light valve and increasing the driving current of the optical writing module can compensate for the decrease of on-off ratio caused by temperature *** is the result of effectively utilizing the photoconductive effect of Bi_(12)SiO_(20)(BSO)*** experimental results verify the feasibility of the proposed method and increase the laser withstand power of amplitude-only OASLM by about a factor of 2.5.

关键词： liquid crystal optically addressed spatial fight modulator beam intensity shaping thermal effects

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Polarization-modulated population distribution of nitrogen molecular ions in a strong laser field

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Physical Review A 2024年第5期109卷 053522-053522页

作者： Yewei Chen Chaohui Zhou Xu Lu Liang Xu Qi Yuan Siyi He Rongyu Gong Ning Zhang Quanjun Wang Shunlin Huang Yuzhu Wu Yi Liu Jinping Yao School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China School of Microelectronics Shanghai University Shanghai 200444 China

We investigate the dependence of N2+ lasing radiation on the polarization ellipticity of the pump laser with the 900- and 980-nm wavelengths. Our results show that the 391-nm lasing radiation is stronger with the elliptically polarized laser in the 900-nm pumping case, while the lasing signal decays monotonically with the increasing ellipticity in the 980-nm pumping case. In contrast, the strongest 428-nm lasing appears with the linear polarization laser for both pumping cases. The theoretical simulations reproduce key observations and reveal that the physical origin underlying the ellipticity-dependent behaviors is the sensitivity of photoexcitation of different channels on the wavelength and polarization of the pump laser. At the 900-nm pump wavelength, one-photon excitation from X2Σg+ to A2Πu of N2+ plays a dominant role in the population inversion. The elliptically polarized laser is beneficial to the perpendicular transition between the two states. In the 980-nm pumping case, the three-photon excitation from X2Σg+ to B2Σu+, which prefers linear polarization pumping, dominates the population inversion. The 428-nm lasing gain mainly depends on the population on the B2Σu+ state, thus the strongest radiation always occurs in the case of linear polarization. The polarization-dependent behaviors of N2+ lasing reflect the complex population inversion mechanism in the strong-field-prepared ionic system.

关键词： Air lasing Electronic excitation & ionization Multiphoton or tunneling ionization & excitation Ultrafast phenomena

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Investigation on the dynamic damage process of HfO2/SiO2 anti-reflection coatings under 1064nm nanosecond laser irradiation

Investigation on the dynamic damage process of HfO2/SiO2 ant...

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Pacific-Rim Laser Damage 2023: optical materials for high-Power Lasers

作者： Xiang, Chengjiang Liu, Xiaofeng Tao, Chunxian Li, Dawei Zhao, Yuan’an Sun, Jian Zhang, Weili Shao, Yuchuan Shao, Jianda School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Key Laboratory of High Power Laser Materials Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China

ISBN: (纸本)9781510672826

Time-resolved pump-probe technology is an effective method to study the dynamic damage process of optics. In this paper, the dynamic damage process of HfO2/SiO2 anti-reflection coating, for the cases that the coating located on the laser incidence (forward process) and exit (reverse process) surface, irradiated by a 1064nm nanosecond laser was studied based on the time-resolved pump-probe technology of intensified charge-coupled device (ICCD). Under the irradiation of the same fluence (52J/cm2), pits without and with the layer peeling existed in both forward and reverse processes. However, the lateral size and depth of the small pits generated by the reverse process are larger than those of the forward process. The finite element analysis shows that the electric field intensity (EFI) on the substrate-coating interface for the forward and reverse processes is similar, which is not enough to form the difference in damage morphology. These results indicate the develop process of the plasma after its formation under the subsequent laser pulse irradiation determines the damage difference in the above two cases. The time-resolved study of anti-reflective coating damage is of great significance for its damage mechanism analysis and practical application. © 2023 SPIE.

关键词： Laser damage

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E- and S-band bismuth-doped fiber amplifier 14

E- and S-band bismuth-doped fiber amplifier

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14th International Conference on Information Optics and Photonics, CIOP 2023

作者： Lau, Kuen Yao Firstov, Sergei Senatorov, Andrey Umnikov, Andrey Xu, Beibei Liu, Xiaofeng Qiu, Jianrong Institute of Light+X Science and Technology Faculty of Electrical Engineering and Computer Science Ningbo University Zhejiang Ningbo351211 China Prokhorov General Physics Institute The Russian Academy of Sciences Dianov Fiber Optics Research Center 38 Vavilov str. Moscow119333 Russia G.G. Devyatyh Institute of Chemistry of High-Purity Substances The Russian Academy of Sciences 49 Tropinin str. Nizhny Novgorod603951 Russia College of Optical Science and Engineering State Key Lab of Modern Optical Instrumentation Zhejiang University Hangzhou310027 China School of Materials Science and Engineering Zhejiang University Hangzhou310027 China

ISBN: (纸本)9781510671744

high-power lasers operating at the E- and S-bands that overlaps with the strong absorption band of water molecules have been exploited for applications such as medical diagnoses, laser therapy and lipolysis. This type of lasers can be realized with a MOPA (master oscillator power amplifier) configuration, consisting of a seed laser and a fiber amplifier, which allows one to achieve easily boosting the output power. However, the efficient fiber amplifiers operating in the E- and S-bands using most rare-earth-doped silica fibers is inaccessible. In contrary, the optical fibers doped with bismuth (Bi) capable of providing broadband amplification from 1100 to 1800 nm can be utilized to build a desired fiber amplifier. In this work, we demonstrated the output characteristics of developed amplifiers based on a Bi-doped 5GeO2 − 95SiO2 fiber (BGSF) drawn from a preform fabricated by the modified chemical vapour deposition (MCVD) technique. The core-pumped fiber amplifiers are characterized by a small-signal gain of >20 dB at a wavelength of ~1440 to 1450 nm and the noise figure of ~4.5 to 6 dB. In addition, the fiber amplifier was employed to amplify a signal from a tunable continuous wave laser from 1390 to 1510 nm. This work presents the significance of Bi-doped fibers to build a fiber amplifier across E- and S-bands which could be attractive for medical diagnoses and laser therapy applications. © 2023 SPIE.

关键词： Fiber amplifiers

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Broadband high efficiency polarization grating with continuously varying periodicity based on liquid crystal polymer

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Journal of Molecular Liquids 2025年 426卷

作者： Zhao, Yadi Wang, Jianguo Chen, Yi Wang, Fajia Wang, Jundong Zhu, Xiangyu Hong, Ruijin Tao, Chunxian Zhang, Dawei Lian, Yafei Zhao, Yuan-an Research and Development Center of Thin Film Optics Shanghai Institute of Optics and Fine Mechanics No.390 Qinghe Road Jiading District Shanghai201800 China Key Laboratory of Materials for High Power Laser Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China

Liquid crystal polarization gratings (LCPGs) exhibit unique optical characteristics, making them widely applicable in various optical fields such as optical field manipulation, beam deflection, and laser radar. Consequently, improving their achromatic performance holds significant importance. In this work, we demonstrate a broadband, high diffraction efficiency, and varying periodicity liquid crystal polarization grating fabricated through the photoalignment technique. A spherical wave is employed for pattern exposure within the interference optical path, with the surface anchoring periodicity varying from 2.56um to 12.04um. Subsequently, a double-layer twisted structure is introduced to construct a high diffraction efficiency PG, which attains an average diffraction efficiency exceeding 98 % within the 520–700 nm spectral range. The structural and diffraction properties of the grating are thoroughly investigated. The manufacturing process for this grating structure is both straightforward and efficient. This work has significant implications for the application and advancement of LCPGs in achromatic performance and contributes substantially to the fields of optical field manipulation and beam deflection. © 2025

关键词： Diffraction efficiency

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Nonsaturated large magnetoresistance and transport dynamics in a n-doped cryogenic WSe2 field-effect device

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Physical Review B 2025年第12期111卷 125307-125307页

作者： Wei-Chen Lin Ching-Chen Yeh Jia-Zhu Zou Nhat Anh Nguyen Phan Inayat Uddin Hai Yen Le Thi Kenji Watanabe Takashi Taniguchi Gil-Ho Kim Department of Engineering and System Science National Tsing Hua University Hsinchu 300 Taiwan Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Department of Physics National Taiwan University Taipei 106 Taiwan Department of Electrical and Computer Engineering Sungkyunkwan University (SKKU) Suwon 164 Republic of Korea Sungkyunkwan Advanced Institute of Nano Technology (SAINT) Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan

Interest in the two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) continues to intensify, driven by their suitable band gaps to supplant silicon as next-generation semiconductor materials. Among various TMDs, tungsten diselenide (WSe2) is renowned for its superior electrical properties in carrier density and mobility under ambient conditions. Despite its notable attributes, the behavior of monolayer WSe2 in the electron-doped regime under cryogenic conditions remains largely uncharted, particularly concerning its magnetotransport properties. In this study, we reveal the transport mechanisms of monolayer WSe2 from high temperatures down to the cryogenic regime. As evident by Efros–Shklovskii variable-range hopping (E-S VRH) in the cryogenic regime, strong Coulomb interactions arise between electrons. Above 8 K, an uncommon nonsaturated quadratic large magnetoresistance (MR) can be explained by the wave-function shrinkage model, which is consistent with the E-S VRH transport mechanism. Notably, the nonsaturated quadratic large MR shows a magnitude up to 1740% at 13 T. These findings underscore the potential applications for monolayer WSe2 in cryogenic field-effect devices, magnetic sensors, and memory devices and mark a significant advance in magnetotransport research.

关键词： Monolayers

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Magnetic anisotropy manipulation and interfacial coupling in Sm_(3)Fe_(5)O_(12)films and CoFe/Sm_(3)Fe_(5)O_(12)heterostructures

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Chinese Physics B 2021年第12期30卷 583-590页

作者： Lei Shen Guanjie Wu Tao Sun Zhi Meng Chun Zhou Wenyi Liu Kang Qiu Zongwei Ma Haoliang Huang Yalin Lu Zongzhi Zhang Zhigao Sheng Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of Sciences(CAS)Hefei 230031China University of Science and Technology of China Hefei 230026China Shanghai Ultra-Precision Optical Manufacturing Engineering Research Center and Key Laboratory of Micro and Nano Photonic Structures(MOE) Department of Optical Science and EngineeringFudan UniversityShanghai 200433China Anhui Laboratory of Advanced Photon Science and Technology Hefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Photovoltaic and Energy Conservation Materials Chinese Academy of SciencesHefei 230031China

The magnetic anisotropy manipulation in the Sm_(3)Fe_(5)O_(12)(SmIG)films and its effect on the interfacial spin coupling in the CoFe/SmIG heterostructures were studied *** switching the orientation of the Gd_(3)Ga_(5)O_(12)substrates from(111)to(001),the magnetic anisotropy of obtained SmIG films shifts from in-plane to *** results can also be obtained in the films on Gd_(3)Ga_(5)O_(12)substrates,which identifies the universality of such orientation-induced magnetic anisotropy ***,the interfacial spin coupling and magnetic anisotropy switching effect on the spin wave in CoFe/SmIG magnetic heterojunctions have also been explored by utilizing the time-resolved magneto-optical Kerr effect *** is intriguing to find that both the frequency and effective damping factor of spin precession in CoFe/SmIG heterojunctions can be manipulated by the magnetic anisotropy switching of SmIG *** findings not only provide a route for the perpendicular magnetic anisotropy acquisition but also give a further path for spin manipulation in magnetic films and heterojunctions.

关键词： perpendicular magnetic anisotropy Sm_(3)Fe_5O_(12)films interfacial spin coupling CoFe/Sm_(3)Fe_5O_(12)heterojunction

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Deep-red emitting Mg2Ti04:Mn^(4+)phosphor ceramics for plant lighting

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Journal of Advanced Ceramics 2021年第1期10卷 88-97页

作者： Zixin WANG Hui LIN Dawei ZHANG Yiming SHEN Yang LI Ruijin HONG Chunxian TAO Zhaoxia HAN Lei CHEN Shengming ZHOU Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modem Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jungong RoadShanghai 200093China Department of Pathology Xinhua HospitalShanghai Jiaotong University School of MedicineShanghai 200093China Laboratory of Micro-Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High-Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

In this study,deep-red emitting Mg2T i04:Mn4 phosphor ceramics were synthesized by the high temperature solid-state reaction *** ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum(FWMH)value of 31 *** peak wavelength was located at 658 nm,which matched the demanded wavelength for *** crystal field strength(Dq)and the Racah parameters(B and C)were estimated by the Tanabe-Sugano *** thermal conductivity of the Mg2Ti(0.999)O4:0.001Mn^(4+)ceramic was 7.535 W/(m·K)at room temperature,which was one order of magnitude higher than that of the traditional packaging method using the silicone gel.A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue region to the purple light region with the thickness of the ceramic *** results indicated that the Mg2Ti04:Mn^(4+)phosphor ceramic was suitable for plant lighting when combined with a blue LED chip.

关键词： solid state reaction optical properties thermal conductivity ceramic phosphor

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programmable Spatially-Varying Linearly Polarized Light with high Degree of Polarization for Planar Liquid Crystal Photonics

SSRN

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SSRN 2024年

作者： Gao, Meini Cheng, Ming Cai, Wenfeng Liu, Ying Dai, Haitao Liu, Yan Jun Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of Science Tianjin University Tianjin300072 China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Engineering Research Center for High Resolution Light Field Display and Technology Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Southern University of Science and Technology Shenzhen518055 China

The use of liquid crystal spatial light modulator (LC-SLM) to manipulate the polarization of the light has been widely explored for different applications, including optical field manipulation, maskless lithography, polarization imaging, and LC planar-optics, among others. Precise polarization manipulation of LC-SLM is therefore highly demanded. Here, we introduce a high-efficiency approach for calibrating the polarization manipulation of a parallel-aligned LC-SLM. The approach revolves around the primary calibration criterion, the degree of polarization (DoP). Through parameter optimization to generate the calibration grayscale, a remarkable DoP as high as 97% can be attained, with a sustained DoP level of up to 93.7%. Experimental results showcase outstanding DoP uniformity in the modulated beam achieved with the calibrated LC-SLM. The root mean square error (RMSE) of polarization for modulated light from LC-SLM is about 0.018. Our proposed pixel-level calibration method enables efficient and precise programming of spatially-varying linearly polarized light (SVLPL), which is verified by the implementation of the Pancharatnam-Berry (PB) lens. The resolution of the fabricated LC planar optical elements with our setup can reach 1.54 μm. The programmable SVLPL with high DoP and resolution is potentially useful for many applications in planar optics and vectorial optical field manipulation. © 2024, The Authors. All rights reserved.

关键词： Calibration

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Liquid crystal variable retarder with microchannels for high-power continuous laser application

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Journal of Molecular Liquids 2025年 419卷

作者： Wang, Jundong Zhao, Yuan-an Tao, Chunxian Wang, Jianguo Chen, Yi Wang, Fajia Zhao, Yadi Liu, Xiaofeng Hong, Ruijin Zhang, Dawei Shao, Jianda School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine Mechanics No.390 Qinghe Road Jiading District Shanghai201800 China Key Laboratory of Materials for High Power Laser Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Center for Excellence in Ultra-Intense Laser Science Chinese Academy of Sciences Shanghai201800 China

A liquid crystal variable retarder (LCVR) experiences significant thermal effects when exposed to high-power continuous-wave lasers, leading to the degradation of its phase delay. When the temperature surpasses the clear point temperature of the liquid crystal material, the device loses its phase delay performance. To address this issue, we designed an LCVR based on microchannel water cooling and heat dissipation. A microchannel fabricated within the substrate of the LCVR in an annular shape can transmit a large-aperture beam. We evaluated the phase delay degradation under continuous-wave laser loading with a spot diameter of 15 mm (1/e2 diameter) at a wavelength of 1070 nm, as well as the phase delay variation under voltage control. By integrating simulation models, we determined the usable area of the microchannel LCVR where the phase distortion on the device is less than λ/50 under continuous-wave laser irradiation at varying power densities. Our results indicate that the microchannel LCVR can maintain a usable area with a diameter of 4.8 mm under continuous-wave laser irradiation at 46 W/cm2. Furthermore, the microchannel LCVR can still achieve a phase delay of 90° by setting the voltage to 7.2 V. The maximum power density tolerated by the LCVR without a microchannel is 22 W/cm2, which is 40 W/cm2 lower than that of the microchannel LCVR. As long as the power density of the irradiation does not exceed 62 W/cm2, the microchannel LCVR can be used in high-power laser systems. © 2024 Elsevier B.V.

关键词： Irradiation

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