1 山东工业陶瓷研究设计院有限公司, 淄博 255000
2 济南大学材料科学与工程学院, 济南 250022
以羧甲基纤维素(CMC)为黏结剂, 通过挤出成型的方式制备氮化硅陶瓷管材, 并研究了黏结剂含量对陶瓷管材生坯性能的影响, 烧结温度对氮化硅陶瓷相对密度、弯曲强度和微观形貌的影响, 以及氮化硅陶瓷的高温强度性能。结果表明: 黏结剂含量为7%(质量分数)时, 可制得干燥收缩均匀、表面光滑、无微裂纹的陶瓷管材生坯; 烧结温度在1 740 ℃时, 氮化硅陶瓷的相对密度和弯曲强度达到最大值, 分别为96%和(684±23) MPa, 其1 200 ℃时的弯曲强度达(380±21) MPa, 具有良好的高温强度性能。
陶瓷 氮化硅 挤出成型 弯曲强度 显微结构 烧结温度 ceramics silicon nitride extrusion flexural strength microstructure sintering temperature
Author Affiliations
Abstract
1 Photonics Research Center, the Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China
2 Department of Electrical Engineering and Photonics Research Institute, the Hong Kong Polytechnic University, Hong Kong 999077, China
3 Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
We report broadband all-fiber optical phase modulation based on the photo-thermal effect in a gas-filled hollow-core fiber. The phase modulation dynamics are studied by multi-physics simulation. A phase modulator is fabricated using a 5.6-cm-long anti-resonant hollow-core fiber with pure acetylene filling. It has a half-wave optical power of 289 mW at 100 kHz and an average insertion loss 0.6 dB over a broad wavelength range from 1450 to 1650 nm. The rise and fall time constants are 3.5 and 3.7 μs, respectively, 2–3 orders of magnitude better than the previously reported microfiber-based photo-thermal phase modulators. The gas-filled hollow-core waveguide configuration is promising for optical phase modulation from ultraviolet to mid-infrared which is challenging to achieve with solid optical fibers.
optical modulators photo-thermal effects hollow-core fibers Opto-Electronic Advances
2023, 6(5): 220085
红外与激光工程
2023, 52(5): 20230132
1 之江实验室量子传感研究中心，浙江 杭州 310023
2 浙江大学光电科学与工程学院，浙江 杭州 310027
悬浮光力系统由于其出色的探测性能，已成为精密测量领域的研究热点。目前悬浮光力系统的探测方案主要包括平衡探测器方案和四象限探测器方案。平衡探测器噪声性能优越，但单个探测器只能测量一个方向的悬浮微粒位移信息，探测系统复杂。四象限探测器方案仅使用单个探测器即可同时探测微粒的三轴位移信息，探测系统简单，但噪声性能较差。本文根据悬浮光力系统的需求，设计了一种四象限探测器，实现了105量级跨阻增益，电学噪声达到商用平衡探测器水平，共模抑制比优于45 dB（50~250 kHz），且入射光功率大于1 mW时，噪声性能只受散粒噪声限制。实验表明，该四象限探测器方案可替代平衡探测器方案，使探测系统小型化，并能很好地满足高探测灵敏度的需求。
探测器 光电探测器 悬浮光力系统 噪声分解 共模抑制 光学学报
2023, 43(11): 1104001
Author Affiliations
Abstract
1 Quantum Sensing Center, Zhejiang Lab, Hangzhou 310000, China
2 State Key Laboratory of Modern Optical Instruments, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
3 e-mail: fuzhenhai@zju.edu.cn
4 e-mail: gaoxw@zhejianglab.com
5 e-mail: huhuizhu2000@zju.edu.cn
The nanomechanical resonator based on a levitated particle exhibits unique advantages in the development of ultrasensitive electric field detectors. We demonstrate a three-dimensional, high-sensitivity electric field measurement technology using the optically levitated nanoparticle with known net charge. By scanning the relative position between nanoparticle and parallel electrodes, the three-dimensional electric field distribution with microscale resolution is obtained. The measured noise equivalent electric intensity with charges of reaches the order of at . Linearity analysis near resonance frequency shows a measured linear range over 91 dB limited only by the maximum output voltage of the driving equipment. This work may provide an avenue for developing a high-sensitivity electric field sensor based on an optically levitated nano-resonator.
Photonics Research
2023, 11(2): 279
Author Affiliations
Abstract
1 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi’an Jiaotong University Xi’an 710049 China
2 Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621900 China
3 Xi’an Technological University Xi’an 710021 China
4 Advanced Materials Testing Technology Research Center Shenzhen University of Technology Shenzhen 518118 China
5 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730070 China
6 State Key Laboratory of Laser Interaction with Matter Northwest Institute of Nuclear Technology Xi’an 710049 China
The laboratory generation and diagnosis of uniform near-critical-density (NCD) plasmas play critical roles in various studies and applications, such as fusion science, high energy density physics, astrophysics as well as relativistic electron beam generation. Here we successfully generated the quasistatic NCD plasma sample by heating a low-density tri-cellulose acetate (TCA) foam with the high-power-laser-driven hohlraum radiation. The temperature of the hohlraum is determined to be 20 eV by analyzing the spectra obtained with the transmission grating spectrometer. The single-order diffraction grating was employed to eliminate the high-order disturbance. The temperature of the heated foam is determined to be T = 16.8 ± 1.1 eV by analyzing the high-resolution spectra obtained with a flat-field grating spectrometer. The electron density of the heated foam is about under the reasonable assumption of constant mass density.
Laser and Particle Beams
2022, 2022(2): 3049749
1 北京市激光应用技术工程技术研究中心，北京 100124
2 北京工业大学跨尺度激光成型制造技术教育部重点实验室，北京 100124
3 北京工业大学激光工程研究院，北京 100124
4 山东大学晶体材料国家重点实验室，山东 济南 250100
5 暨南大学光子技术研究院，广东 暨南510632
为了研究空芯反谐振光纤的中红外激光传输能力，使用自制的无节点空芯反谐振光纤进行了2.60~4.35 μm的中红外激光传输实验。该空芯反谐振光纤包层由七根平均壁厚为800 nm的玻璃毛细管组成，光纤外径为365 μm，纤芯直径为115 μm。使用中红外可调谐光参量振荡器作为光源，测试了光纤在2.60，3.27，3.41，3.80，4.08，4.21，4.35 μm七个波段的激光传输及损耗特性。结果显示，该光纤可实现2.6~4.08 μm波段低损耗导光，在3.27 μm传输损耗最低，为0.037 dB/m。光纤在4.08 μm和4.35 μm处的传输损耗分别为3.200 dB/m 和0.788 dB/m，而该波段熔融石英吸收损耗分别高达1000 dB/m 和3000 dB/m。研究结果证明，空芯反谐振光纤在中红外激光柔性传输领域拥有巨大潜力。
光纤光学 空芯反谐振光纤 中红外激光 激光传输 激光与光电子学进展
2022, 59(3): 0306004
王莹莹 1张楠 2张培晴 1,3,4,5王训四 1,3,4,5戴世勋 1,3,4,5,*
1 宁波大学高等技术研究院红外材料及器件实验室，浙江 宁波 315211
2 南京大学电子科学与工程学院，江苏 南京 210093
3 浙江省光电探测材料及器件重点实验室，浙江 宁波 315211
4 先进红外光电材料及器件浙江省工程研究中心，浙江 宁波 315211
5 红外材料及器件研究浙江国际科技合作基地，浙江 宁波 315211
制备了具有全正色散特性的Ge-As-Se-Te双包层拉锥光纤，并研究了其中的红外超连续谱输出特性。所采用的拉锥光纤的纤芯直径为12 μm，外包层直径为108 μm，锥区长度为9.8 mm。利用6 μm的飞秒激光泵浦10 cm长的拉锥光纤，获得了1.5～14.3 μm的超连续谱输出。与同样纤芯直径的单包层拉锥光纤相比，双包层结构不仅增强了光纤的机械强度，还减少了泵浦能量在锥区的损耗，进一步拓宽了超连续谱的宽度。模拟计算结果表明，该超连续谱具有高的相干性。
Author Affiliations
Abstract
1 Laboratory of Infrared Material and Devices, The Research Institute of Advanced Technologies, Ningbo University, Ningbo 315211, China
2 Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo, 315211, China
3 Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province, Ningbo, 315211, China
Chalcogenide (ChG) glasses have the characteristics of a wide transparency window (over 20 μm) and high optical nonlinearity (up to 103 times greater than that of silica glasses), exhibiting great advantages over silica and other soft glasses in optical property at mid-infrared (MIR) wavelength range. These make them excellent candidates for MIR supercontinuum (SC) generation. Over the past decades, great progress has been made in MIR SC generation based on ChG fibers in terms of spectral extension and output power improvement. In this paper, we introduce briefly the properties of ChG glasses and fibers including transmission, nonlinearity, and dispersion, etc. Recent progress in MIR SC generation based on ChG fibers is reviewed from the perspective of pump schemes. We also present novel ChG fibers such as As-free, Te-based, and chalcohalide fibers, which have been explored and employed as nonlinear fibers to achieve broadband SC generation. Moreover, the potential applications of MIR SC sources based on ChG fibers are discussed.
Author Affiliations
Abstract
1 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communication, Institute of Photonics Technology, Jinan University, Guangzhou 511443, China
2 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
The pure-silica hollow-core fiber (HCF) has excellent thermostabilities that can benefit a lot of high-temperature sensing applications. The air-core microstructure of the HCF provides an inherent gas container, which can be a good candidate for gas or gas pressure sensing. This paper reviews our continuous efforts to design, fabricate, and characterize the high-temperature and high-pressure sensors with HCFs, aiming at improving the sensing performances such as dynamic range, sensitivity, and linearity. With the breakthrough advances in novel anti-resonant HCFs, sensing of high temperature and high pressure with HCFs will continuously progress and find increasing applications.
hollow-core fiber high-temperature sensing high-pressure sensing Chinese Optics Letters
2021, 19(7): 070601
