Optics and Laser Technology最新文献_第9页

Experimental topology of a femtosecond ring fiber cavity laser using SOA-MZI for coincident OFDM dispatch 使用 SOA-MZI 的飞秒环形光纤腔激光器的实验拓扑结构，用于重合 OFDM 调度

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-17 DOI: 10.1016/j.optlastec.2024.112076

Hassan Termos , Ali Mansour

In this paper, we present an experimental design for the simultaneous transmission of 1024 subcarriers using a ring fiber cavity laser (RFCL) based on a semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI). The SOA-MZI-RFCL system demonstrates exceptional passive power stability, with fluctuations under 0.27 % root mean square (RMS) over one hour and an average output power of up to 11.8 dBm with an optical bandwidth of 8.8 nm. Notably, the system achieves the output pulse width is compressed to 32 fs using a four-prism pulse compressor. We employ two configurations of orthogonal frequency-division multiplexing (OFDM): one with all 256 subcarriers transmitting 512-QAM-OFDM data and another with four carriers of 256 subcarriers each transmitting 1024-QAM or distinct M−QAM (quadrature amplitude modulation) data. A performance analysis based on Error Vector Magnitude (EVM) is conducted for both configurations, varying OFDM subcarrier frequencies and cyclic prefix (CP). By increasing the subcarriers to 1024 and using a 12-bit depth, we achieve significant improvement in transmission quality. For the 512-QAM-OFDM configuration, the EVM reaches 1.1 % at 100 GHz. In the second configuration, the EVM remains at 1.1 % for 1024-QAM at 103 GHz. Additionally, when varying M−QAM formats, the EVM decreases from 1.1 % for 512-QAM-OFDM at 100 GHz to 0.25 % for 4096-QAM-OFDM at 103 GHz with a 10 % CP. Ultimately, the SOA-MZI-RFCL system exhibits outstanding performance, making it a strong candidate for high-quality optical transmission applications.

本文介绍了利用基于半导体光放大器马赫-泽恩德干涉仪（SOA-MZI）的环形光纤腔激光器（RFCL）同时传输 1024 个子载波的实验设计。SOA-MZI-RFCL 系统显示出卓越的无源功率稳定性，一小时内的波动均方根（RMS）小于 0.27%，平均输出功率高达 11.8 dBm，光带宽为 8.8 nm。值得注意的是，该系统使用四棱镜脉冲压缩器将输出脉冲宽度压缩至 32 fs。我们采用了两种正交频分复用（OFDM）配置：一种是全部 256 个子载波传输 512-QAM-OFDM 数据，另一种是四个载波各 256 个子载波传输 1024-QAM 或不同的 M-QAM（正交幅度调制）数据。在改变 OFDM 子载波频率和循环前缀 (CP) 的情况下，对这两种配置进行了基于误差矢量幅度 (EVM) 的性能分析。通过将子载波增加到 1024 个并使用 12 位深度，我们显著提高了传输质量。在 512-QAM-OFDM 配置中，100 GHz 时的 EVM 达到 1.1%。在第二种配置中，1024-QAM 的 EVM 在 103 GHz 时保持在 1.1%。此外，当改变 M-QAM 格式时，EVM 从 100 GHz 的 512-QAM-OFDM 的 1.1 % 下降到 103 GHz 的 4096-QAM-OFDM 的 0.25 %，CP 为 10 %。最终，SOA-MZI-RFCL 系统表现出卓越的性能，成为高质量光传输应用的有力候选。

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引用次数: 0

A new outlier rejection approach for non-Lambertian photometric stereo 非朗伯光度立体测量的新离群点剔除方法

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-17 DOI: 10.1016/j.optlastec.2024.112142

Shun Wang , Xiangyu Cao , Junheng Li , Xianyou Li , Ke Xu

Photometric stereo (PS) has garnered increasing attention due to its adeptness in restoring local fine textures. However, non-Lambertian reflections present in almost all real-world objects limit the effectiveness of the Lambertian model for surface normal vector estimation. Although BRDF-based and deep learning-based methods have become mainstream, recent research shows that comparable accuracy can also be achieved through simple filtering of observed intensity values. Nevertheless, these methods only consider the relative bias of pixel values and require manual specification of the number of pixels to be culled and the number of iterations. To address these issues, this paper proposes corresponding improvement methods. Firstly, a weighted inter-relationship function (IRF) fused with Huber loss is introduced to robustly and effectively evaluate the abnormal degree of pixel value. Secondly, based on the IRF curve and histogram statistical analysis, the number of excluded pixels is adaptively calculated. Thirdly, linear equations are then constructed based on the photometric equations, and the maximum between-class variance method is employed to achieve a high degree of sparsity, enabling fast and effective normal vector estimation. Finally, to verify the effectiveness of the proposed algorithm for non-Lambertian PS vision, quantitative verification tests on the synthetic dataset and the open-source datasets “DiLiGenT” and “DiLiGenT-PI” in real-world scenarios, and qualitative assessment experiments on real metal roughness samples are conducted. The experimental results demonstrate that, compared with the position threshold and IRF methods, our algorithms not only significantly enhance the accuracy of normal vector solutions but also markedly improve the operational efficiency of the algorithm, laying a solid foundation for practical online applications. These results fully validate the correctness and effectiveness of the proposed algorithm and provide a reference for the further development of outlier removal algorithms.

光度立体（Photometric stereo，PS）因其善于还原局部精细纹理而受到越来越多的关注。然而，几乎所有现实世界中的物体都存在非朗伯反射，这限制了朗伯模型对表面法向量估计的有效性。虽然基于 BRDF 和深度学习的方法已成为主流，但最近的研究表明，通过对观测到的强度值进行简单过滤，也能获得相当的精度。然而，这些方法只考虑了像素值的相对偏差，并且需要手动指定要剔除的像素数量和迭代次数。针对这些问题，本文提出了相应的改进方法。首先，引入与 Huber 损失融合的加权相互关系函数（IRF），以稳健有效地评估像素值的异常程度。其次，根据 IRF 曲线和直方图统计分析，自适应地计算出排除像素的数量。第三，在光度方程的基础上构建线性方程，并采用最大类间方差法实现高度稀疏性，从而实现快速有效的法向量估计。最后，为了验证所提算法在非朗伯PS视觉中的有效性，我们对合成数据集、开源数据集 "DiLiGenT "和 "DiLiGenT-PI "进行了真实场景下的定量验证测试，并对真实金属粗糙度样本进行了定性评估实验。实验结果表明，与位置阈值法和 IRF 法相比，我们的算法不仅显著提高了法向量解的精度，而且明显改善了算法的运行效率，为实际在线应用奠定了坚实的基础。这些结果充分验证了所提算法的正确性和有效性，为离群点去除算法的进一步发展提供了参考。

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引用次数: 0

Tailoring performance through loss engineering in ring-waveguide lasers for enhanced Single-Mode lasing 通过环形波导激光器损耗工程调整性能，增强单模激光器的性能

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-17 DOI: 10.1016/j.optlastec.2024.112116

Pegah Eivazy Arvanagh , Mobin Yaghoobi , Fatemeh Moradiani , Nima Nematimansur , Gholam-Mohammad Parsanasab

Loss engineering is a valuable approach for controlling the properties of ring-waveguide lasers. By carefully adjusting the waveguide’s loss parameters, it is possible to create customized lasers with improved performance for specific applications. In this study, we present the fabrication, characterization, and simulation of a ring-waveguide laser with loss-engineering capabilities. Initially, we optimized the waveguide’s cross-section to reduce scattering loss caused by side-wall roughness, achieving a low loss of 0.03 dB/cm. Next, we investigated the effect of the coupling coefficient on the lasing properties of the device by varying the gap between the waveguide and the resonator. Our experimental results demonstrate that by fine-tuning the coupling coefficient, we can achieve single-mode lasing with an impressive side-mode suppression ratio (SMSR) of over 47 dB at a wavelength of 598 nm. These findings offer valuable insights into loss-engineering techniques for ring-waveguide lasers and showcase the potential for single-mode emission lasers with high stability, which can be applied in various fields.

损耗工程是控制环形波导激光器性能的一种重要方法。通过仔细调整波导的损耗参数，可以为特定应用制造出性能更高的定制激光器。在本研究中，我们介绍了具有损耗工程功能的环形波导激光器的制造、表征和模拟。首先，我们优化了波导的横截面，以减少侧壁粗糙度引起的散射损耗，从而实现了 0.03 dB/cm 的低损耗。接下来，我们通过改变波导和谐振器之间的间隙，研究了耦合系数对器件激光特性的影响。实验结果表明，通过微调耦合系数，我们可以在 598 纳米波长上实现单模激光，侧模抑制比（SMSR）超过 47 dB，令人印象深刻。这些发现为环形波导激光器的损耗工程技术提供了宝贵的见解，并展示了具有高稳定性的单模发射激光器的潜力，这种激光器可应用于各个领域。

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引用次数: 0

Design, fabrication and thermal annealing of Nd-doped all-solid anti-resonant silicate fibers for 0.9 μm laser 用于 0.9 μm 激光的掺钕全固态反谐振硅酸盐光纤的设计、制造和热退火

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.optlastec.2024.112118

Yue Cheng , Qiubai Yang , Chunlei Yu , Yafei Wang , Yiming Zhu , Yichong Chen , Suya Feng , Qinling Zhou , Fei Yu , Lili Hu

We report the design, fabrication and characterization of a Nd-doped silicate-glass-based all-solid anti-resonant fiber (Nd-AS-ARF) for 0.9 μm laser. Through the rod-in-tube technique combined with high-temperature drawing, the Nd-AS-ARF was successfully fabricated with a background loss of 0.3 dB/m at 1200 nm. The results of electron probe microanalysis (EPMA) test indicate a significantly diffusion of the Ba element accompanying the fiber drawing process. Additional thermal annealing could further enhance element diffusion, enabling the active regulation of the resonant band towards longer wavelengths. In the 30 cm-long Nd-AS-ARF, the loss at 1.06 μm is 10.5 dB higher than at 0.92 μm, favoring the Nd three-level laser. To the best of our knowledge, this is the first time that a rare-earth doped AS-ARF is fabricated.

我们报告了用于 0.9 μm 激光的掺钕硅酸盐玻璃全固态抗谐振光纤（Nd-AS-ARF）的设计、制造和特性分析。通过棒中管技术和高温拉伸技术，成功制造出了掺钕硅酸盐玻璃全固态抗共振光纤（Nd-AS-ARF），1200 nm波长处的本底损耗为0.3 dB/m。电子探针显微分析（EPMA）测试结果表明，钡元素在纤维拉伸过程中发生了显著扩散。额外的热退火可进一步加强元素扩散，从而使谐振波段向更长波长主动调节。在 30 cm 长的 Nd-AS-ARF 中，1.06 μm 波长的损耗比 0.92 μm 波长的损耗高出 10.5 dB，这有利于 Nd 三级激光器。据我们所知，这是首次制造出掺稀土的 AS-ARF。

引用次数: 0

Comparative study of optical and luminescence properties of Nd3+-ions doped K2O/KF − Gd2O3 − P2O5 glasses laser and O-band wave-guide amplifier application 掺杂 Nd3+ 离子的 K2O/KF - Gd2O3 - P2O5 玻璃激光器和 O 波段波导放大器应用的光学和发光特性比较研究

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.optlastec.2024.112096

I. Khan , M. Shoaib , Fen Qiao , I. Ullah , G. Rooh , Khalid A. Alrashidi , Saikh Mohammad , Seema Mukamil , N. Chanthima , N. Intachai , S. Kothan , Shukkat Khattak , Xiao Lixian , Ho Yong Tai , J. Kaewkha

Nd³⁺-ions doped KF-Gd₂O₃-P₂O₅ and K₂O-Gd₂O₃-P₂O₅ glasses were comparatively studied for optical, laser and O-band waveguide amplifier applications. The density, molar volume and refractive index of K₂O-Nd glass are higher than KF-Nd glass. K₂O-Nd glass has higher value of ΔE which is attributed to have greater proneness to transfroming weak-bonds into structural defects. For both the K₂O-Nd and KF-Nd glasses, Ω₄ > Ω₆ > Ω₂ is the observed trend of JO-parameters which indicate the high viscosity for both the glasses under investigations. Three characteristic emission transitions corresponding to ⁴F_3/2 → ⁴I_9/2 (902 nm), ⁴F_3/2 → ⁴I_11/2 (1059 nm) and ⁴F_3/2 → ⁴I_13/2 (1327 nm) were observed for K₂O-Nd and KF-Nd glasses. The NIR band emission spectra of Nd³⁺-ion doped K₂O-Nd and KF-Nd glasses under λ_ex = 580 nm cover telecommunication O-band window (1275–1425 nm). The stimulated-emission cross-section σ(λ_P) for K₂O-Nd glass has higher value as compared KF-Nd glass. The experimental branching ratio for both glasses have value greater than 50 %. All these result depict that K₂O-Nd and KF-Nd glasses have higher potential for low threshold and high gain laser, integrated optical wave-guide and O-band gain flattened wave-guide amplifiers.

比较研究了掺杂 Nd3+ 离子的 KF-Gd2O3-P2O5 和 K2O-Gd2O3-P2O5 玻璃在光学、激光和 O 波段波导放大器中的应用。K2O-Nd 玻璃的密度、摩尔体积和折射率均高于 KF-Nd 玻璃。K2O-Nd 玻璃的 ΔE 值较高，这是因为它更容易将弱键转变为结构缺陷。对于 K2O-Nd 和 KF-Nd 玻璃，Ω4 > Ω6 > Ω2 是观察到的 JO 参数趋势，这表明所研究的两种玻璃都具有高粘度。在 K2O-Nd 和 KF-Nd 玻璃中观察到三个特征发射转变，分别对应于 4F3/2 → 4I9/2 (902 nm)、4F3/2 → 4I11/2 (1059 nm) 和 4F3/2 → 4I13/2 (1327 nm)。在 λex = 580 nm 下，掺杂 Nd3+ 离子的 K2O-Nd 和 KF-Nd 玻璃的近红外波段发射光谱覆盖了电信 O 波段窗口（1275-1425 nm）。与 KF-Nd 玻璃相比，K2O-Nd 玻璃的受激发射截面 σ(λP) 值更高。两种玻璃的实验支化率都大于 50%。所有这些结果都表明，K2O-Nd 和 KF-Nd 玻璃在低阈值、高增益激光器、集成光波导和 O 波段增益扁平波导放大器方面具有更大的潜力。

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引用次数: 0

Coherent control of Surface Plasmon Polaritons Excitation via tunneling-induced transparency in quantum dots 通过量子点中的隧道诱导透明度实现表面等离子体极化子激发的相干控制

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.optlastec.2024.112078

Fazal Badshah , Muqaddar Abbas , Yuan Zhou , Haibo Huang , Rahmatullah

A scheme for coupler-free excitation of Surface Plasmon Polaritons (SPPs) based on tunneling-induced transparency (TIT) is proposed. The system consists of a top layer of metal film and a bottom layer made of a quantum dot (QD) medium with a permittivity less than one. The QD medium is engineered to exhibit the TIT phenomenon. Absorption losses in the QD medium, which reduce the field enhancement required for efficient SPP excitation, can be minimized by applying a magnetic field between the quantum dots. By utilizing TIT and manipulating the QDs with an external magnetic field, the system aims to optimize the conditions for SPP generation and increase the propagation length. Moreover, the group velocity of SPPs can be adjusted from slow to fast propagation using tunneling voltage. Efficient SPP excitation is crucial for developing devices such as plasmonic waveguides and high-sensitivity sensors.

本文提出了一种基于隧道诱导透明（TIT）的无耦合器激发表面等离子体极化子（SPPs）的方案。该系统由顶层金属膜和由介电常数小于 1 的量子点（QD）介质构成的底层组成。量子点介质经设计后可呈现 TIT 现象。量子点介质中的吸收损耗会降低高效 SPP 激发所需的场增强，而通过在量子点之间施加磁场，可以将这种损耗降至最低。通过利用 TIT 和用外部磁场操纵 QD，该系统旨在优化 SPP 生成的条件并增加传播长度。此外，还可以利用隧道电压调整 SPP 的群速度，使其从慢速传播变为快速传播。高效的 SPP 激发对于开发等离子体波导和高灵敏度传感器等设备至关重要。

引用次数: 0

Numerical optimization of cesium bismuth iodide-based CIGS/Perovskite tandem solar cells for enhanced photovoltaic performance 对基于碘化铯铋的 CIGS/Perovskite 串联太阳能电池进行数值优化以提高光伏性能

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.optlastec.2024.112072

Priyanshu Yadav , Poonam Subudhi , Himanshu Dixit , Deepak Punetha

Perovskite solar cells have gained significant attention due to their high efficiency. This study presents a comprehensive numerical modeling of CIGS/Perovskite bilayer solar cells aimed at enhancing their performance. Utilizing advanced device simulation software, we investigate the impact of integrating cesium bismuth iodide-based perovskite with a second-generation CIGS absorber layer. The model evaluates critical parameters including layer thickness, defect density, doping concentration, band gap, and temperature to optimize device architecture. Initial simulations of the baseline structure, featuring SnO2 as the electron transport layer (ETL) and CuSCN as the hole transport layer (HTL), reveal a power conversion efficiency (PCE) of 5.75 %, a fill factor (FF) of 42.9 %, a short-circuit current density (Jsc) of 11.26 mA/cm², and an open-circuit voltage (Voc) of 1.19 V. Through targeted optimization, we achieve significant performance enhancements, increasing the PCE to 15.69 %, the FF to 89.34 %, the Jsc to 12.43 mA/cm², and the Voc to 1.41 V. The optimized device structure FTO/SnO2/Cs3Bi2I9/CIGS/CuSCN/Pt demonstrates a promising pathway for developing efficient and environmentally friendly perovskite solar cells. This study underscores the potential of tandem cell configurations in achieving stable, high-efficiency, lead-free photovoltaic solutions.

过氧化物太阳能电池因其高效率而备受关注。本研究对 CIGS/Perovskite 双层太阳能电池进行了全面的数值建模，旨在提高其性能。利用先进的设备模拟软件，我们研究了将基于碘化铋铯的包晶石与第二代 CIGS 吸收层整合在一起的影响。该模型评估了包括层厚度、缺陷密度、掺杂浓度、带隙和温度在内的关键参数，以优化器件结构。以 SnO2 为电子传输层 (ETL) 和 CuSCN 为空穴传输层 (HTL) 的基线结构的初步模拟显示，其功率转换效率 (PCE) 为 5.75%，填充因子 (FF) 为 42.9%，短路电流密度 (Jsc) 为 11.26 mA/cm2，开路电压 (Voc) 为 1.19 V。FTO/SnO2/Cs3Bi2I9/CIGS/CuSCN/Pt 的优化器件结构为开发高效、环保的过氧化物太阳能电池提供了一条前景广阔的途径。这项研究强调了串联电池配置在实现稳定、高效、无铅光伏解决方案方面的潜力。

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引用次数: 0

Design and implementation of metasurfaces for enhancing non-line-of-sight communication in mining tunnels 设计和实施元表面，增强采矿隧道内的非视距通信

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.optlastec.2024.112130

Xiaojun Huang , Yifei Wang , Yiwen Wang , Chuan Li , Jianchen Zhang , Shouqing Li

Coal mine tunnels contain numerous bends and branches that obstruct the direct propagation of wireless signals between transmitters and receivers, creating non-line of sight (NLoS) areas. Due to limitations on the transmission power of base stations within these tunnels, signal coverage holes are prevalent. Therefore, ensuring adequate signal coverage in coal mine tunnels is imperative. In this paper, we present a 900 MHz reflective metasurface to enhance the signal strength of mine tunnel signals in NLoS areas. The proposed metasurface unit has a two-layer structure, which achieves a 3-bit coverage of electromagnetic wave phase with a relatively small size, only 0.12λ. The metasurface allows for abnormal reflection of linearly polarized waves from −53° to +53° with the max RCS of 21.10 dBsm to 23.84 dBsm, respectively. Subsequently, a bend tunnel is established to simulate the underground propagation of electromagnetic waves in the tunnel. The metasurface is placed in the mine tunnel, and the simulation results are tested and validated in tunnel scenarios. The results show the proposed metasurface with an enhancement effect is 5 dBm on the signal in the NLoS area and filled the signal coverage by 60 m in this scenario within −100 dBm. The proposed metasurface effectively covers signals in NLoS areas, and appropriate deployment can reduce operational costs and be applied in various scenarios.

煤矿巷道中有许多弯道和分支，这些弯道和分支会阻碍无线信号在发射器和接收器之间的直接传播，从而形成非视线（NLoS）区域。由于这些隧道内基站的发射功率有限，信号覆盖漏洞十分普遍。因此，确保煤矿巷道内有足够的信号覆盖范围势在必行。在本文中，我们提出了一种 900 MHz 反射式元面，用于增强煤矿巷道信号在 NLoS 区域的信号强度。所提出的元面单元具有两层结构，可实现 3 位电磁波相位覆盖，且尺寸相对较小，仅为 0.12λ。元表面允许线性极化波在 -53° 至 +53° 范围内发生异常反射，最大 RCS 分别为 21.10 dBsm 至 23.84 dBsm。随后，建立了一个弯曲隧道来模拟电磁波在隧道中的地下传播。将元表面置于矿井隧道中，并在隧道场景中测试和验证了仿真结果。结果表明，所提出的元面对 NLoS 区域信号的增强效果为 5 dBm，并在 -100 dBm 范围内将信号覆盖范围扩大了 60 米。建议的元面可有效覆盖 NLoS 区域的信号，适当的部署可降低运营成本，并适用于各种场景。

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引用次数: 0

Demonstration of computational ghost imaging through fog 雾中计算鬼影成像演示

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.optlastec.2024.112075

Huakang Lin, Chunling Luo

Imaging through fog is an active and challenging topic in the fields of optical imaging and image processing. Ghost imaging (GI), as an indirect optical imaging technique, can acquire clear images of unknown objects hidden in some hostile environments, such as underwater, turbulence, and scattering media. Here the computational ghost imaging (CGI) technique is employed to retrieve images of objects hidden in a foggy environment. Based on the extended Huygens-Fresnel principle, the imaging formula for the CGI system through fog is developed with a Lorentz shaped incoherent source. The fog model is established by combining atmospheric turbulence and atmospheric scattering. Two objects with different slit widths are applied in the numerical examples and the effects of the propagation distance, turbulence strength, and scattering particle concentration are analyzed in detail. The results show that the quality of retrieved images is hardly degraded in the CGI system through fog under short-distance conditions. While the effect of fog on imaging quality becomes more pronounced as the distance increases. To improve the quality of the CGI system through fog, the Lorentz shaped incoherent source is effectively employed to obtain better ghost images than the widely used Gaussian source, especially in long-distance conditions. Thus the work is very useful for promoting CGI real applications, such as marine navigation, road transportation safety, and remote sensing imaging.

雾中成像是光学成像和图像处理领域一个活跃而又充满挑战的课题。鬼成像（GI）作为一种间接光学成像技术，可以获取隐藏在水下、湍流和散射介质等恶劣环境中的未知物体的清晰图像。本文采用计算鬼成像（CGI）技术来获取隐藏在雾环境中的物体图像。根据扩展的惠更斯-菲涅尔原理，利用洛伦兹非相干源建立了穿越雾的 CGI 系统成像公式。结合大气湍流和大气散射建立了雾模型。在数值示例中应用了两个具有不同狭缝宽度的物体，并详细分析了传播距离、湍流强度和散射粒子浓度的影响。结果表明，在短距离条件下，雾对 CGI 系统的成像质量几乎没有影响。而随着距离的增加，雾对成像质量的影响会越来越明显。为了提高雾中 CGI 系统的质量，与广泛使用的高斯源相比，洛伦兹非相干源被有效地用于获取更好的重影图像，尤其是在长距离条件下。因此，这项工作对促进 CGI 的实际应用非常有用，如海洋导航、道路交通安全和遥感成像。

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引用次数: 0

Non-line-of-sight imaging with adaptive artifact cancellation 具有自适应伪影消除功能的非视距成像技术

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-16 DOI: 10.1016/j.optlastec.2024.112081

Hongyuan Zhou , Ziyang Chen , Jumin Qiu , Sijia Zhong , Dejian Zhang , Tongbiao Wang , Qiegen Liu , Tianbao Yu

Non-Line-of-Sight (NLOS) image reconstruction algorithms commonly encounter a significant challenge: their dependence on scenario and empirically derived parameters, which undermines the algorithms’ generalizability and adaptiveness. To tackle this problem, we have devised a forward projection model and a novel evaluation metric for NLOS reconstruction, named Time-of-Flight Structural Similarity (TOF-SSIM). This metric is independent of ground truth and serves to assess image quality and systematically determine the optimal parameters of reconstruction algorithms. Within this method, this paper presents an Adaptive Artifact Cancellation (AAC) algorithm. We first generate a sequence of new Time-of-Flight (TOF) histograms by subtracting the TOF histogram convolved with a Gaussian kernel from the original TOF histogram. Subsequently, the new TOF histograms are backprojected to reconstruct an artifact-reduced image. Our method has been validated using both our datasets and public datasets, evidencing that the AAC algorithm excels in producing efficient and consistent reconstructions under both confocal and non-confocal configurations, with reconstruction quality comparable to other state-of-the-art algorithms.

非视线（NLOS）图像重建算法通常会遇到一个重大挑战：它们对场景和经验推导参数的依赖性削弱了算法的通用性和适应性。为了解决这个问题，我们设计了一种前向投影模型和一种新的 NLOS 重建评估指标，命名为飞行时间结构相似性（TOF-SSIM）。该指标与地面实况无关，可用于评估图像质量和系统地确定重建算法的最佳参数。在这种方法中，本文提出了一种自适应伪影消除（AAC）算法。首先，我们从原始的飞行时间直方图中减去用高斯核卷积的飞行时间直方图，从而生成一系列新的飞行时间直方图。随后，对新的 TOF 直方图进行反向投影，重建伪影减少的图像。我们的方法已通过我们的数据集和公共数据集进行了验证，证明 AAC 算法在共焦和非共焦配置下都能出色地生成高效、一致的重建，重建质量可与其他最先进的算法相媲美。

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引用次数: 0