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Effects of Multiple Contaminant Components on Spectral Performance of Reflective Mirrors in Resonance Ionization Spectroscopy

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Effects of Multiple Contaminant Components on Spectral Perfo...

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

作者： Zhang, Yulin Wang, Yanzhi Jiang, Yugang Shao, Jianda Zhang, Zhizhong Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine Mechanics No. 390 Qinghe Road Jiading District Shanghai201800 China National Key Laboratory of Particle Transport and Separation Technology No. 168 Jintang Road Hedong District Tianjin300171 China Tianjin Key Laboratory of Optical Thin Films Tianjin Jinhang Institute of Technical Physics No. 357 Baoshui Road Dongli District Tianjin300300 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine Mechanics No. 390 Qinghe Road Jiading District Shanghai201800 China

ISBN: (纸本)9781510672826

With the increasing scope of applications of laser, it is crucial to study the pollution of optical components for regulating beams in intricate environments. In resonance ionization spectroscopy instruments, the optics may suffer from contamination caused by both the analyzed sample and environmental impurities, which can cause detrimental effects on their optical properties, potentially leading to their degradation or destruction. The paper analyses the spectral performance of two categories of reflective mirrors that have been exposed to four kinds of contamination (Nd, Nd-oxide, Fe, and C) for comparison of reflectance degradation process variations. It is found that the impact of multiple contaminant components on the spectral performance of reflective mirrors is directly linked to their light transmission characteristics, with metal contamination in particular causing the most severe degradation. © 2023 SPIE.

关键词： Contamination

Non-Euclidean conformal devices with continuously varying refractive index profiles based on bi-spheres

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arXiv 2024年

作者： Lv, Wenjing Zhou, Jiaojiao Liu, Y. Xu, Lin Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information Technology Center of Free Electron Laser & High Magnetic Field Anhui University Anhui Province Hefei230601 China Department of Mathematics and Physics Key Laboratory of Advanced Electronic Materials and Devices Anhui Jianzhu University Anhui Province Hefei230601 China Department of Physics School of Physics Hubei University Hubei Province Wuhan430062 China Department of Optics & Optical Engineering School of Physical Sciences University of Science and Technology of China Anhui Province Hefei230026 China

Either conformal transformation optics or geodesic mapping provides a design method to bend light rays in two-dimensional space with a nonuniform refractive index profile. In this paper, we combine both methods above to design a conformal invisible cloak based on bi-spheres with a refractive index profile varying from 0 to 10.7, smaller than 24.6 for the previous case of a single sphere. Moreover, we obtain an omnidirectional retro-reflector and a specular reflector by making position adjustments to mirrors, and achieve similar invisible effect by tuning sizes of the bi-spheres. Our work expands the toolkits for designing conformal devices with continuously-varying index profile. © 2024, CC BY-NC-ND.

关键词： Spheres

high Figure of Merit optical Phase Change Material Based on Mg-Doped Vo2

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SSRN

SSRN 2023年

作者： Zhao, Xin Kang, Tongtong Ma, Junwei Ke, Zungui Yao, Mengqi Luo, Qin Ma, Xiaoshao Bi, Lei Qin, Jun State Key Laboratory of High Power Semiconductor Lasers of Changchun University of Science and Technology China National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of China Chengdu610054 China KeyLaboratoryofMulti-spectralAbsorbingMaterialsandStructuresofMinistryofEducation University of Electronic Science and Technology of China Chengdu611731 China Research Center on Vector Optical Fields Institute of Optics and Electronics Chinese Academy of Sciences Chengdu610209 China Southwest Institute of Technical Physics Chengdu China Key Laboratory of Lidar and Device Chengdu China

VO2 is a promising optical phase change material for tunable photonic devices showing large optical contrast, low power consumption and ultrafast modulation. However, the large optical loss of the VO2 in its rutile phase limits its application. Here, we demonstrate low loss and high figure of merit in epitaxial VO2 films on c-cut sapphire substrates by Mg2+ doping. The Mg2+ doping can heavily reduce the optical loss in rutile phase, and improve the FOM at mid-infrared wavelengths. As the Mg2+ doping levels increasing from 0 at. % to 11.9 at. %, the extinction coefficient in rutile phase decreases from 10 to 0.1 at around 7.5 μm wavelength, achieving 100 times lower loss. Although the refractive index change is also reduced, the 11.9 at. % Mg-doped VO2 still shows 3.7 times higher figure-of-merit (1.32) compared to the undoped film (0.35) in 7.5 μm wavelength. First-principles calculation indicate that the Mg2+ doping can localize and lower the DOS of the V 3d electrons, leading to lower absorption in the mid-infrared wavelengths. Our work provides an alternative phase change material for active photonics devices applications. © 2023, The Authors. All rights reserved.

关键词： Magnesium compounds

Influence of ITO layer on laser tolerance of liquid crystal device under continuous-wave laser loading

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Optik 2022年 270卷

作者： Wang, Kun Gong, He Liu, Xiaofeng Tao, Chunxian Zhao, Yuan'an Li, Dawei Cao, Zhaoliang 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 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 Mathematics and Physics Suzhou University of Science and Technology Jiangsu Suzhou215009 China Center for Excellence in Ultra-Intense Laser Science Chinese Academy of Sciences Shanghai201800 China

The laser performance of liquid-crystal devices (LCDs) must be considered because of their applications in laser systems. The phase modulation variation mechanisms, as well as the key absorption factor under continuous-wave (CW) laser loading, remain unclear. In this study, the influence of indium tin oxide (ITO) layers on the laser tolerance of LCDs under CW laser loading was investigated. Comparing the phase modulation variations and thermal effects of passive and active LCDs, the influence of the ITO absorbing layer and the decisive role of temperature on the laser tolerance of the LCDs were confirmed. The results showed that the laser tolerance of the LCD with ITO layers was approximately one-seventh of that of the LCD without ITO layers. ITO layers have proven to be the main absorption factor for active LCDs. However, the variations in phase modulation and morphology under CW laser loading were similar for LCDs with or without ITO layers. The phase modulation variations of the LCDs increased with increasing temperature in the irradiated area. For LCDs with or without ITO, once the CW laser loading induced a similar temperature increase, their phase modulation variations were almost the same. The temperature rise of LCDs is confirmed to be an effective parameter for evaluating the phase modulation degradation of LCDs in high-power CW laser applications. The coincidence between the theoretical and experimental phase modulation variations for LCDs with or without ITO indicates that the temperature-induced refractive index change was the main reason for the LCD phase modulation variation under CW laser loading. These results clarify the basic mechanisms of the phase modulation variation of LCDs under CW laser loading and provide guidance for process optimization and application of LCDs in high-power laser systems. © 2022 Elsevier GmbH

关键词： Continuous wave lasers

Enhanced Population on Ionic Excited States by Synchronized Ionization and Multiphoton Resonance

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arXiv 2023年

作者： Chen, Yewei Lei, Hongbin Wang, Quanjun Xie, Hongqiang Zhang, He Lu, Xu Zhang, Ning Huang, Shunlin Wu, Yuzhu Liu, Jianpeng Zhang, Qian Liu, Yi Zhao, Zengxiu Zhao, Jing Yao, Jinping State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Department of Physics National University of Defense Technology Changsha410073 China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China School of Science East China University of Technology Nanchang330013 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China School of Microelectronics Shanghai University Shanghai200444 China

We study population distributions and lasing actions of N2+ drieen by femtosecond lasers with earious waeelengths, and uncoeer an efficient ionic excitation mechanism induced by synchronized ionization and multiphoton resonance. Our results show that the strongest N2+ lasing appears around 1000 nm pump waeelength. At the optimal waeelength, the pump-energy threshold for air lasing generation is reduced by fiee folds compared with that required by the preeious 800 nm pump laser. Simulations based on the ionization-coupling model indicate that although the Stark-assisted three-photon resonance can be satisfied within a broad pump waeelength range, the optimal pump waeelength arises when the dynamic three-photon resonance temporally synchronizes with the ionization injection. In this case, the ionic dipoles created at each half optical cycle haee the same phase. The dipole phase locking promotes the continuous population transfer from ionic ground state to the excited state, gieing rise to a dramatic increase of excited-state population. This work proeides new insight on the photoexcitation mechanism of ions in strong laser fields, and opens up a route for optimizing ionic radiations. Copyright © 2023, The Authors. All rights reserved.

关键词： Excited states

Effect of Gd3+/Nd3+- dual doped borate glasses on the physical and spectroscopic properties for the NIR emission at 1.069 µm

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Optik 2023年第1期290卷

作者： Manyum, P. Rittisut, W. Mool-am-kha, P. Wantana, N. Ruangtaweep, Y. Rujirawat, S. Yimnirun, R. Kidkhunthod, P. Prasatkhetragarn, A. Kothan, S. Kim, H.J. Minh, P.H. Kaewkhao, J. School of Physics and Center of Excellence in High Energy Physics and Astrophysics Suranaree University of Technology Nakhon Ratchasima30000 Thailand Construction Materials Group Engineering Materials Division Department of Science Service Ministry of Higher Education Science Research and Innovation Bangkok10400 Thailand Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand Center of Excellence in Glass Technology and Materials Science Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand 111 University Avenue Muang Nakhon Ratchasima30000 Thailand Rayong Wangchan21210 Thailand Rayong Wangchan21210 Thailand Applied Science Program School of Science University of Phayao Phayao56000 Thailand Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai50200 Thailand Department of Physics Kyungpook National University Daegu41566 Korea Republic of Institute of Physics Vietnam Academy of Science and Technology 10 Dao Tan Ba Dinh Hanoi Viet Nam

Near-infrared luminescence properties of dual doped Gd3+/Nd3+-incorporated glasses were manufactured using the melt-quenching technique and characterized by several techniques. The modification in glass structure may be seen in the differences in density, molar volume, and refractive index that occur when the amount of lanthanide oxide in the glass increases. The spectroscopic properties of Nd3+ in these glasses are quite well understood, and the observed optical characteristics may be used to process and eventually determine laser properties. According to the results of XANES, the Nd oxidation state remains the predominant peak for Nd3+ in all of the samples. The transition from 4I9/2 to 4G5/2 +2G7/2 is important for the strongest band in the absorption spectra, which can be seen at 584 nm. The luminescence spectra show peaks caused by 4F3/2→4IJ (J=11/2, 13/2) at three excitation wavelengths of 526, 574 and 805 nm. After the processing, we created glass samples for the study of photoluminescence with various amounts of Nd2O3 incorporated into the best host, 25Li2O-5Al2O3-2.5Gd2O3-(67.5-X)B2O3-XNd2O3. Based on luminescence intensity, it is determined that 1.0 mol% of Nd2O3 is the concentration quenching in the studied glasses. The 4F3/2 →4I11/2 transition at 1069 nm, excited by 526, 578 and 803 nm, has the highest emission intensity. The combined findings of the glasses demonstrate that near-infrared luminescence may be successfully used with them. All of the analysis shows that the dual doped Gd3+/Nd3+ borate glass would be a potential solid-state laser candidate. © 2023 Elsevier GmbH

关键词： Neodymium compounds

Emission-Enhanced high-Performance Al2o3-Ce: (Y, Tb)Ag Composite Ceramic Phosphors for high-Brightness White Led/Ld Illumination

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SSRN

SSRN 2022年

作者： Tian, Yanna Chen, Jie Yi, Xuezhuan Jiang, Renjie Lin, Hui Tang, Yanru Zhou, Shengming Laboratory of Micro-Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High-Power Laser 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 Beijing 100049 United States Shanghai Tech University Shanghai201210 China Engineering Research Center of Optical Instrument and System University of Shanghai for Science and Technology Shanghai200093 China

Owing to their excellent thermal robustness, high light saturation threshold, and high luminous efficiency, Al 2 O 3 -Ce doped garnet composite ceramic phosphors (CCPs) have attracted extensive attention for applications in laser illumination. In this study, we report the fabrication of high-performance Al 2 O 3 -Ce:(Y, Tb) 3 Al 5 O 12 CCPs via a solid-state reaction. The promoted absorption of Ce 3+ by blue light due to the bidirectional energy transfer process between Ce 3+ and Tb 3+ was discovered in Al 2 O 3 -Ce:(Y, Tb)AG, which can effectively enhance the yellow light emission intensity and adjust the correlated color temperature (CCT). Based on this effect, Al 2 O 3 –Ce: (Y 0.9 Tb 0.1 ) 3 Al 5 O 12 CCPs show the best performance in thermal quenching and luminous efficiency;for example, its luminous efficiency at 450 K droops by 17% from the initial luminous efficiency, and its luminescence efficiency reaches 248.7 lm/W, when driven by 2.236 W of incident laser power. In addition, compared to the Al 2 O 3 -Ce: YAG CCPs, the CCT of the Al 2 O 3 –Ce: (Y 0.8 Tb 0.2 ) 3 Al 5 O 12 CCPs decreased by 3800 K under the excitation of LD, which is of great significance for realizing the warm white-light illumination. © 2022, The Authors. All rights reserved.

关键词： Phosphors

Nanometer displacement measurement based on metrological self-mixing grating interferometer traceable to the pitch standard of one-dimension chromium self-traceable grating

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arXiv 2023年

作者： Gu, Zhenjie Xie, Zhangning Chang, Zhikun Xiao, Guangxu Yin, Zhijun Lin, Zichao Tong, Zhou Lei, Lihua Jin, Tao Xue, Dongbai Deng, Xiao Chen, Xinbin Li, Tongbao Institute of Precision Optical Engineering Tongji University Shanghai200092 China MOE Key Laboratory of Advanced Micro-Structured Materials Tongji University Shanghai200092 China Shanghai Frontiers Science Center of Digital Optics Tongji University Shanghai200092 China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications Tongji University Shanghai200092 China School of Physics Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Measurement and Testing Technology Shanghai200093 China University of Shanghai for Science and Technology Shanghai200093 China

Traceability of precision instrument and measuring method is the core issue in metrology science. In the field of nanometer length measurement, the laser interferometers are usually used to trace the measurement value to the laser wavelength, but the laser wavelength is sensitive to the environment disturbance. Chromium self-traceable grating is an ideal nanometer length reference grating with pitch traceability, fabricated by the atomic lithography technique. The new nanometer length traceability chain can be established based on the pitch traceability of chromium self-traceable grating, which is often used to calibrate the systematic error of the atomic force microscope. In this paper, the metrological self-mixing grating interferometer based on the chromium self-traceable grating (SMGI-Cr) is firstly established, whose interfere phase is traceable to the pitch of the chromium self-traceable grating directly and traceable to the chromium atomic transition frequency of energy level 7S3 →7P4 indirectly. The nanometer displacement measurement is also achieved by the SMGI-Cr. The measurement error is no more than 0.2366%, compared to a commercial interferometer. © 2023, CC BY.

关键词： Displacement measurement

Chromium Self-Traceable Length Standard: Investigating Geometry and Diffraction for Length Traceability Chain

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arXiv 2023年

作者： Lin, Zichao Yao, Yulin Xie, Zhangning Xue, Dongbai Zhou, Tong Tang, Zhaohui Lei, Lihua Jin, Tao Dun, Xiong Deng, Xiao Cheng, Xinbin Li, Tongbao Institute of Precision Optical Engineering Tongji University Shanghai200092 China MOE Key Laboratory of Advanced Micro-Structured Materials Tongji University Shanghai200092 China Shanghai Frontiers Science Center of Digital Optics Tongji University Shanghai200092 China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications Tongji University Shanghai200092 China School of Physics Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Measurement and Testing Technology Shanghai201203 China University of Shanghai for Science and Technology Shanghai200093 China

Natural constant-based metrology methods offer an effective approach to achieving traceability in nanometric measurements. The Cr grating, fabricated by atom lithography and featuring a pitch of d=212.7705±0.0049 nm traceable to the Cr transition frequency 7S3→7P40, demonstrates potential as a self-traceable length standard in nano-length metrology by grating interferometer. This research aims to analyze and engineer the diffraction characteristics that enhance the Cr grating as a self-traceable length standard within the length traceability chain based on the Cr transition frequency. Accordingly, we investigate the geometric morphology and diffraction characteristics of the Cr grating, analyzes the influence of the grating's polarization-sensitive characteristics on the Littrow configuration grating interferometer, and establishes the criteria for Cr grating fabrication. Experimentally, we fabricate an expanded Cr grating by scanning atom lithography, characterize its diffraction performance, and conduct preliminary verification of length measurement in a self-traceable grating interferometer. This work adheres to the international trend of flattened metrology development, offering a valuable reference for advancing subsequent metrological technologies throughout the new traceability chain. Copyright © 2023, The Authors. All rights reserved.

关键词： Diffraction