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Effect of anisotropy of a single-mode fibre on lightning-induced rotation of polarisation of a light signal in an optical ground wire 单模光纤的各向异性对光地线中光信号的雷击极化旋转的影响
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-01-01 DOI: 10.1070/QEL17970
D. V. Gorbatov, V. Konyshev, T. O. Lukinykh, O. Nanii, A. G. Novikov, V. Treshchikov, R. R. Ubaydullaev
A numerical model is constructed for calculating lightning-induced rapid changes in the polarisation state of a light signal at the output of a fibre-optic communication line with an optical ground wire. It is shown that taking into account anisotropy of real optical fibres has a noticeable effect on the shape of the polarisation rotation speed time profile. It is found that the maximum rate of change in the polarisation state and its temporal profile depend on the location of the lightning strike in the fibre span, the magnitude of fibre anisotropy and the direction of propagation of a light wave.
本文建立了一个数值模型,用于计算在带光地线的光纤通信线路输出端由闪电引起的光信号偏振态的快速变化。结果表明,考虑实际光纤的各向异性对偏振旋转速度时间曲线的形状有显著的影响。研究发现,偏振态的最大变化率及其时间分布取决于雷击在光纤中的位置、光纤各向异性的大小和光波的传播方向。
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引用次数: 2
YAG : R3+ (R = Ce, Dy, Yb) nanophosphor-based luminescent fibre-optic sensors for temperature measurements in the range 20 – 500 °C YAG: R3+ (R = Ce, Dy, Yb)纳米荧光粉发光光纤传感器,用于温度测量范围在20 - 500°C
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-01-01 DOI: 10.1070/qel17971
S. Evstropiev, V. Demidov, D. Bulyga, R. Sadovnichii, G. Pchelkin, D. Shurupov, Yu.F. Podrukhin, A. Matrosova, N. Nikonorov, K. Dukelskii
We report the development of a group of luminescent fibre-optic temperature sensors that use Ce3+-, Dy3+-, and Yb3+- doped yttrium aluminium garnet (YAG) nanophosphors as thermosensitive materials. The nanophosphors have been prepared in the form of powders with a crystallite size from 19 to 27 nm by a polymer – salt method and exhibit bright luminescence at 550 (YAG : Ce3+), 400, 480 (YAG : Dy3+), and 1030 nm (YAG : Yb3+). The sensor design includes a silica capillary, partially filled with a nanophosphor, and two large-aperture multimode optical fibres located in the capillary, which deliver excitation light and receive and transmit the photoluminescence signal. The photoluminescence signal amplitude of all the sensors decreases exponentially with increasing temperature, pointing to characteristic thermal quenching of photoluminescence and adequate operation of the devices up to 500 °C. The highest temperature sensitivity among the fibre-optic sensors is offered by the YAG : Ce3+ nanophosphor-based devices.
我们报道了一组使用Ce3+-, Dy3+-和Yb3+掺杂钇铝石榴石(YAG)纳米荧光粉作为热敏材料的发光光纤温度传感器的开发。采用聚合物-盐法制备了晶粒尺寸为19 ~ 27 nm的纳米荧光粉,并在550 nm (YAG: Ce3+)、400 nm、480 nm (YAG: Dy3+)和1030 nm (YAG: Yb3+)处表现出明亮的发光。传感器设计包括一个部分填充纳米荧光粉的二氧化硅毛细管,以及位于毛细管中的两根大孔径多模光纤,该光纤发送激发光并接收和传输光致发光信号。所有传感器的光致发光信号幅值随温度的升高呈指数下降,表明光致发光具有特有的热猝灭特性,器件在500℃以下可正常工作。光纤传感器中温度灵敏度最高的是YAG: Ce3+纳米荧光粉器件。
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引用次数: 1
Agar phantoms of biological tissue for fluorescence monitoring of photodynamic therapy 用于光动力治疗荧光监测的生物组织琼脂幻影
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-01-01 DOI: 10.1070/qel17967
A. Khilov, V.A. Shishkova, E. Sergeeva, D. Kurakina, M. Kirillin
An approach to fabricating agar phantoms mimicking spectral optical properties of biological tissues with fluorescent inclusions is proposed, which allows one to imitate the problem of optical visualisation of superficial biological tissues after the administration of a chlorin-based photosensitiser. The different arrangement of a fluorescent layer within a phantom makes it possible to simulate biological tissue in the cases of both topical application and intravenous injection of a photosensitiser. It is shown that absorption and scattering spectra of phantoms are in good agreement with the spectra of real biological tissues in the wavelength range of 500-800 nm. Changes in spectra of absorption and scattering coefficients of phantoms, as well as in their fluorescent properties induced by the addition of a fluorescent marker (chlorinbased photosensitiser) are demonstrated.
提出了一种用荧光内含物制造模拟生物组织光谱光学特性的琼脂幻影的方法,这使得人们可以在使用氯基光敏剂后模拟表面生物组织的光学可视化问题。幻影内荧光层的不同排列使得在局部应用和静脉注射光敏剂的情况下模拟生物组织成为可能。结果表明,在500 ~ 800 nm的波长范围内,模拟物的吸收和散射光谱与真实生物组织的光谱具有较好的一致性。在光谱的吸收和散射系数的变化,以及在他们的荧光特性诱导荧光标记物(氯基光敏剂)的加入被证明。
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引用次数: 2
Red blood cell in the field of a beam of optical tweezers 红血球场中的一束光镊
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-01-01 DOI: 10.1070/QEL17962
P. Ermolinskiy, A. Lugovtsov, A. Semenov, A. Priezzhev
We consider the effect of a tightly focused laser beam with a wavelength of 1064 nm and a power from 10 to 160 mW on red blood cells during their optical trapping with optical tweezers. It is found that the shape of a red blood cell, which alters after optical trapping, ceases to change when the trapping duration is less than 5 min and the laser beam power is less than 60 mW. At a beam power above 80 mW, the red blood cell begins to fold at a trapping duration of about 1 min, and at powers above 100 – 150 mW, the red blood cell membrane ruptures in 1 – 3 min after optical trapping. It is also found that with repeated short-term capture of a red blood cell in an optical trap, the deformation properties of the membrane change: it becomes more rigid. The obtained results are important both for understanding the mechanisms of interaction of a laser beam with red blood cells and for optimising the technique of optical experiments, especially for measuring the deformation properties of a membrane using optical tweezers.
我们考虑了波长为1064 nm、功率为10 ~ 160 mW的紧密聚焦激光束在用光镊捕获红细胞时对红细胞的影响。结果表明,当光捕获时间小于5 min,激光束功率小于60 mW时,红细胞的形状不再发生变化。当光束功率大于80 mW时,红细胞在捕获时间约1分钟内开始折叠,当光束功率大于100 - 150 mW时,红细胞膜在光捕获后1 - 3分钟内破裂。研究还发现,在光学陷阱中反复短期捕获红细胞,膜的变形特性会发生变化:它变得更加坚硬。所获得的结果对于理解激光束与红细胞相互作用的机制和优化光学实验技术,特别是使用光镊测量膜的变形特性具有重要意义。
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引用次数: 5
Melanin diagnostics with nonlinear optics: a mini-review 用非线性光学诊断黑色素:一个小回顾
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2022-01-01 DOI: 10.1070/qel17963
E. Shirshin, B. Yakimov, G. Budylin, K. E. Buyankin, A. G. Armaganov, V. V. Fadeev, A. Kamalov
Optical methods are widely used to perform fundamental studies of living systems and solve problems of biomedical diagnostics. Along with the classical spectroscopy, methods of nonlinear optics (e.g., multiphoton microscopy) are also applied in biophotonics. The potential of nonlinear optical methods for visualisation and analysis of the properties of endogenous chromophore molecules are considered in this minireview. Melanin – a pigment with specific spectral features of photophysical properties in the visible and near-IR ranges – is taken as an example. It is discussed what information about its localisation in tissues and structural organisation can be obtained by nonlinear optical methods: multiphoton fluorescence microscopy (including fluorescence lifetime imaging), third harmonic generation, pump – probe spectroscopy, and coherent anti-Stokes Raman spectroscopy.
光学方法被广泛用于生命系统的基础研究和解决生物医学诊断问题。随着经典光谱学,非线性光学方法(如多光子显微镜)也应用于生物光子学。本文综述了非线性光学方法在内源性发色团分子的可视化和性质分析方面的潜力。以黑色素为例,黑色素是一种在可见光和近红外光谱范围内具有特定光物理特性的色素。讨论了非线性光学方法:多光子荧光显微镜(包括荧光寿命成像)、三次谐波产生、泵浦探针光谱和相干反斯托克斯拉曼光谱可以获得关于其在组织和结构组织中的定位的信息。
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引用次数: 1
Functional flexible photonics-assisted frequency measurement based on combination of stimulated Brillouin scattering and a Mach – Zehnder interferometer 基于受激布里渊散射和马赫-曾德尔干涉仪组合的功能柔性光子辅助频率测量
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2021-12-01 DOI: 10.1070/QEL17660
Lanfeng Huang, Yongjun Li, Shanghong Zhao, Tao Lin, Xuan Li, Guodong Wang, Zihang Zhu
A functional flexible photonics-assisted frequency measurement (PFM) is proposed. Owing to polarisation multiplexing, the electro-optic (O/E) conversion can be performed in a single optical path, which endows the system high stability and concise configuration. Moreover, using a specially designed functional coarse/accurate frequency measurement (C/AFM) module, a large covering range, moderate accuracy, and fast response frequency measurement results can be ensured in a radar warning receiver (RWR), whereas high accurate results can be used in an electronic countermeasures receiver (ECMR). The simulation results show that a strict monotonous amplitude comparison function (ACF) can be constructed based on the structure of a Mach – Zehnder interferometer (MZI) to map the signal frequency, with a measurement error of less than 0.2 GHz in the range of 1 – 31 GHz. This coarse measurement results can be used to perform radar warning. Based on this result, a highly accurate frequency measurement result is achieved through stimulated Brillouin scattering (SBS). The results reveal that the accuracy is improved to better than 20 MHz. Noteworthy, the C/AFM module consists of purely passive devices, which makes this system meet the potential of integration.
提出了一种功能柔性光子辅助频率测量系统(PFM)。由于采用偏振复用技术,光电转换可以在单光路内完成,从而使系统具有高稳定性和简洁的结构。此外,采用专门设计的功能性粗/精确频率测量(C/AFM)模块,雷达告警接收机(RWR)可以获得大覆盖范围、中等精度和快速响应频率测量结果,而电子对抗接收机(ECMR)则可以获得高精度结果。仿真结果表明,基于马赫-曾德尔干涉仪(MZI)的结构,可以构造严格单调幅度比较函数(ACF)来映射信号频率,在1 ~ 31 GHz范围内测量误差小于0.2 GHz。这种粗略的测量结果可用于雷达预警。在此基础上,利用受激布里渊散射(SBS)获得了高精度的频率测量结果。结果表明,改进后的精度优于20 MHz。值得注意的是,C/AFM模块由纯无源器件组成,这使得该系统满足了集成的潜力。
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引用次数: 1
Correlation between optical fibre diameter and characteristics of tilted fibre Bragg grating-assisted sensors 倾斜光纤Bragg光栅辅助传感器光纤直径与特性的关系
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2021-12-01 DOI: 10.1070/qel17663
K. Tomyshev, E. I. Dolzhenko, O. Butov
We report the results of a study on the influence of the fibre cladding diameter on the accuracy and resolution of tilted fibre Bragg grating-assisted refractometers. Tilted fibre Bragg gratings are an essential element used to develop high-precision fibre sensors for environmental monitoring. Comparative research was performed using one of comprehensive processing algorithms employing spectral envelope analysis. It was shown that the sensor accuracy decreases with decreasign fibre cladding diameter. At the same time, an increase in the diameter deteriorates the spectral pattern contrast, thus impeding the development of high-efficiency sensor elements.
本文报道了光纤包层直径对倾斜光纤布拉格光栅辅助折射仪精度和分辨率影响的研究结果。倾斜光纤布拉格光栅是用于环境监测的高精度光纤传感器的基本元件。采用光谱包络分析的综合处理算法进行了对比研究。结果表明,光纤包层直径越小,传感器精度越低。同时,直径的增加会降低光谱模式的对比度,从而阻碍了高效传感器元件的发展。
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引用次数: 0
Application of complex fully connected neural networks to compensate for nonlinearity in fibre-optic communication lines with polarisation division multiplexing 复杂全连接神经网络在偏振分复用光纤通信线路非线性补偿中的应用
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2021-12-01 DOI: 10.1070/qel17656
S. Bogdanov, O. Sidelnikov, A. Redyuk
A scheme is proposed to compensate for nonlinear distortions in extended fibre-optic communication lines with polarisation division multiplexing, based on fully connected neural networks with complex-valued arithmetic. The activation function of the developed scheme makes it possible to take into account the nonlinear interaction of signals from different polarisation components. This scheme is compared with a linear one and a neural network that processes signals of different polarisations independently, and the superiority of the proposed neural network architecture is demonstrated.
提出了一种基于复值算法的全连接神经网络的极化分复用扩展光纤通信线路非线性失真补偿方案。所开发的方案的激活函数使得考虑来自不同极化分量的信号的非线性相互作用成为可能。将该方案与线性方案和独立处理不同极化信号的神经网络进行了比较,证明了所提出的神经网络结构的优越性。
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引用次数: 1
Measurement of the longitudinal relaxation time for the nitrogen nuclear spin in a nitrogen-vacancy colour centre of diamond 金刚石氮空位色心中氮核自旋纵向弛豫时间的测量
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2021-12-01 DOI: 10.1070/qel17654
V. Soshenko, I. Cojocaru, S. Bolshedvorskii, O. Rubinas, A. Smolyaninov, V. Vorobyov, V. Sorokin, A. Akimov
A longitudinal relaxation time of a nitrogen-14 atom nuclear spin for a nitrogen-vacancy (NV) colour centre in diamond is measured by the modified double optical resonance method. The diamond sample was grown by the method of high temperature and pressure and comprised 1 ppm of NVcentres. The longitudinal relaxation time was 43(6) s, which was compared to the time calculated in the model of relaxation due to the electron spin of colour centre interaction with phonons and spin reservoir. The time measured well agrees with predictions of the model.
用改进的双光学共振方法测量了金刚石中氮空位(NV)色中心的氮-14原子核自旋纵向弛豫时间。该金刚石样品采用高温高压法生长,含有1ppm的nvcentre。纵向弛豫时间为43(6)s,与色心电子自旋与声子和自旋储层相互作用的弛豫模型计算的时间进行了比较。测量的时间与模型的预测一致。
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引用次数: 0
Reflectogram shape deformation in distributed fibre systems in the presence of spontaneous noise in the probe radiation 探针辐射中存在自发噪声时分布式光纤系统的反射图形状变形
IF 0.9 4区 工程技术 Q3 Engineering Pub Date : 2021-12-01 DOI: 10.1070/qel17661
N.I. Kalmykov, D. Kovalenko, I. Lobach, S. Kablukov
We report a study of the effect of spontaneous emission-induced noise in probe pulsed radiation on the reflectogram shape deformation in a distributed temperature sensor based on Raman scattering of light. Since the fraction of spontaneous emission in the used erbiumdoped amplifier can reach 50 % of the total power, this leads to deviations of reflectograms in the temperature sensor from the theoretical exponential dependence and, as a result, can yield a temperature measurement error of several degrees. Filtering the radiation with an amplitude modulator makes it possible to reduce these deviations. The influence of spontaneous emission on reflectograms is studied theoretically and experimentally.
本文报道了一种基于光拉曼散射的分布式温度传感器,研究了探针脉冲辐射中自发发射引起的噪声对反射图形状变形的影响。由于在所使用的掺铒放大器中自发发射的分数可以达到总功率的50%,这导致温度传感器中的反射图偏离理论指数依赖,因此可以产生数度的温度测量误差。用调幅器过滤辐射可以减少这些偏差。从理论上和实验上研究了自发辐射对反射图的影响。
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引用次数: 0
期刊
Quantum Electronics
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