Optics Communications最新文献

{"title":"Wide-field-of-view rapid acquisition and tracking control for portable optical communication systems","authors":"Xuan Wang ,&nbsp;Xiangsheng Meng ,&nbsp;Junfeng Han ,&nbsp;Chen Wang ,&nbsp;Yinghong He","doi":"10.1016/j.optcom.2025.131790","DOIUrl":"10.1016/j.optcom.2025.131790","url":null,"abstract":"<div><div>Optical communication technology has been extensively applied in long-distance space communication due to its numerous advantages. With the advancement of CubeSat technology, portable optical communication systems have also emerged. When applied to ground-based scenarios, this technology can effectively support emergency high-speed communication in environments where radio frequencies are unavailable or restricted. However, its primary limitation lies in the rapid acquisition of wide-field-of-view laser links. To address this challenge, we propose a compact coaxial transceiver design for a portable optical communication terminal, utilizing Micro-Electro-Mechanical Systems (MEMS) micromirrors and a Quadrant Detector (QD). Furthermore, we developed a QD spot position deviation rapid acquisition algorithm for quickly determining the laser spot position on the QD. This represents a novel and efficient technique for achieving fast and precise large-area acquisition and tracking control. Experimental results demonstrate that the proposed portable optical communication terminal is capable of rapid deployment and efficient laser link acquisition, completing acquisition within 83 s over a distance of 506 m, within a 60° × 40° field of view. These findings mark a significant advancement toward the practical application of ground-based portable optical communication technology.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131790"},"PeriodicalIF":2.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of beam spatial characteristics in high-power Yb:YAG Innoslab amplifier","authors":"Yuguang Huang ,&nbsp;Jie Guo ,&nbsp;Jinfeng Li ,&nbsp;Zichen Gao ,&nbsp;Xiaoyan Liang","doi":"10.1016/j.optcom.2025.131794","DOIUrl":"10.1016/j.optcom.2025.131794","url":null,"abstract":"<div><div>We investigated the spatial distribution of the output beam of our existed high-power Yb: YAG Innoslab laser amplifier and proposed that the generation of sidelobes was caused by spherical aberration distortion. A beam propagation model based on the reconstructed crystal temperature distribution was established to study the beam evolution in the Innoslab laser amplifier, and the degradation of the beam profile and phase distribution of the signal during amplification was presented. The simulation reproduced the beam characteristics of the signal during amplification. The generation of sidelobes in the output beam profile was observed in the simulation, which was in agreement with the experimental measurements. The beam profile distribution of the signal began to exhibit sidelobes in the third pass, which became increasingly apparent during the subsequent amplification process, resulting in beam splitting and the sidelobe effect.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131794"},"PeriodicalIF":2.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depth estimation via shift-photography in Alvarez Lens imaging systems","authors":"Jiapu Yan,&nbsp;Menghao Li,&nbsp;Tingting Jiang,&nbsp;Huajun Feng,&nbsp;Zhihai Xu,&nbsp;Qi Li,&nbsp;Yueting Chen","doi":"10.1016/j.optcom.2025.131760","DOIUrl":"10.1016/j.optcom.2025.131760","url":null,"abstract":"<div><div>The Alvarez lens imaging system employs a novel zooming and focusing mechanism achieved through the lateral displacement of its Alvarez lenses. To enhance the usability of the Alvarez lens, we propose a method that leverages the functionality of shift photography to perform depth estimation using multiple image inputs. We simulate the imaging perspectives and scene displacements during shift photography using the Unity 3D engine while simultaneously acquiring pixel-to-pixel depth information. Based on the point spread function (PSF) of the optical system, which varies with the field of view and depth, we can accurately simulate the imaging effects of the Alvarez lens system. Experimental results demonstrate that our approach achieves superior accuracy compared to monocular depth estimation.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131760"},"PeriodicalIF":2.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance evaluation of large-aperture highly reflective mirrors for high-power laser applications with reflectance mapping","authors":"Yanling Han ,&nbsp;Bincheng Li ,&nbsp;Hao Cui ,&nbsp;Jing Wang","doi":"10.1016/j.optcom.2025.131786","DOIUrl":"10.1016/j.optcom.2025.131786","url":null,"abstract":"<div><div>The performance evaluation of large-aperture highly reflective (HR) mirrors, which are widely used in high-power laser systems, is essential for the long-term operation of these laser systems. In this study, the development of the HR mirror's reflectance distribution, which is measured via cavity ring-down (CRD) technique, to be a general quality control tool for the large-aperture HR mirrors is attempted. Various parameters and data analysis methods are defined and developed to evaluate the performance of the large-aperture HR mirrors. Specifically, we introduced the maximum-probability reflectance (<em>R</em>_{<em>max-p</em>}), which describes the reflectance distribution excluding the influence of defects, and the maximum-residual-probability reflectance (<em>R</em>_{<em>max-r-p</em>}), which characterizes the reflectance distribution affected by defects. Additionally, we discussed the full-width at half-maximum (FWHM) of the residual reflectance distribution, which quantifies the variation in reflectance due to defects, as well as the reflectance difference (Δ<em>R</em>) defined as the difference between <em>R</em>_{<em>max-p</em>} and <em>R</em>_{<em>max-r-p</em>}. These parameters collectively provide a comprehensive assessment of the HR mirrors' performance. The developed parameters and data analysis methods were applied to the performance evaluation of 68 HR mirrors with diameters ranging from 200 mm to 400 mm, with 0- or 45-degree angle of incidence (AOI) and fused silica or sapphire substrates. Statistical analysis revealed that HR mirrors with a 0-degree AOI have higher reflectance than that with a 45-degree AOI, while HR mirrors deposited on fused silica substrates showed slightly better reflection performance than that deposited on sapphire substrates. The statistical results demonstrated that the proposed parameters and data analysis methods are helpful to evaluate the performance of large-aperture HR mirrors.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131786"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient third harmonic generation based on the spatial distribution characteristics of the second harmonic generation efficiency","authors":"Mingheng Yuan ,&nbsp;Yuan Sui ,&nbsp;Xiaopeng Liu ,&nbsp;Yuan Wu ,&nbsp;Wen Huang ,&nbsp;Guangyin Zhang ,&nbsp;Zhenao Bai ,&nbsp;Zhongwei Fan","doi":"10.1016/j.optcom.2025.131785","DOIUrl":"10.1016/j.optcom.2025.131785","url":null,"abstract":"<div><div>Picosecond ultraviolet lasers are extensively utilized in precision manufacturing and material processing, where system designs prioritize longevity and stability. However, the emphasis on durability and simplicity—exemplified by extra-cavity configurations with LBO crystals—often compromises the overall conversion efficiency, underscoring the need for further optimization. We developed a simulation model based on the spatial distribution characteristics of second harmonic generation (SHG) efficiency to guide the design of an efficient third harmonic generation (THG) system. We developed a simulation model that reveals the functional relationship between the fundamental peak power and the optimal beam diameter. Based on the simulation results, we optimized the design of a highly efficient third harmonic generation system. Consequently, we achieved a conversion efficiency of <span><math><mrow><mn>17.89</mn><mo>%</mo></mrow></math></span> for wavelength conversion from <span><math><mrow><mn>1030</mn><mi>n</mi><mi>m</mi></mrow></math></span> to <span><math><mrow><mn>343</mn><mi>n</mi><mi>m</mi></mrow></math></span>. The design integrated disk regenerative amplification and single-crystal fiber technologies for the first time, delivering an ultraviolet output with an average power of <span><math><mrow><mn>30.2</mn><mi>W</mi></mrow></math></span>. This method advances the third harmonic generation efficiency and offers new pathways for compact, high-performance picosecond ultraviolet laser development in scientific and industrial domains.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131785"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three dimensional amplitude modulation and demodulation technology based on independent dual sideband optical communication system","authors":"Yilin Chen,&nbsp;Zheng Hu,&nbsp;Jiabao Zhao,&nbsp;Feihan Li,&nbsp;Hangzhi Zhu,&nbsp;Jiangnan Xiao","doi":"10.1016/j.optcom.2025.131791","DOIUrl":"10.1016/j.optcom.2025.131791","url":null,"abstract":"<div><div>This article proposes the use of Three Dimensional Amplitude Modulation (TDAM) and demodulation techniques in independent dual sideband systems without increasing the modulation order of the carrier amplitude. This system generates two columns of random binary sequences digitally. One is modulated with 3D-8QAM at −13 GHz, and the other is modulated with 3D-8QAM at 29 GHz with half amplitude. Then, the three dimensions x, y, and z of the three-dimensional signal are modulated onto the carriers <span><math><mrow><mi>cos</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow></mrow></math></span>, <span><math><mrow><mi>sin</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow></mrow></math></span> and <span><math><mrow><mi>cos</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow><mo>∗</mo><mi>sin</mi><mrow><mo>(</mo><mrow><mi>ω</mi><mi>t</mi></mrow><mo>)</mo></mrow></mrow></math></span>, respectively, so that the left and right independent sidebands are superimposed in the IQ modulator. At the receiving end, two independent sideband signals are received through a single photodiode (PD). After PD square law conversion, a three-dimensional 8TDAM signal is synthesized, and then separated and demodulated by a digital signal processing (DSP) to obtain two separate three-dimensional signals. The simulation results show that the system can successfully achieve 8 Gbaud independent 8TDAM signal 20 km SSMF transmission, with an HD-FEC threshold of 3.8 × 10⁻³ and an error rate of 7 %. The system has demonstrated that three-dimensional signals can be transmitted independently in both sidebands, greatly simplifying the system structure, further reducing implementation costs, and improving spectral efficiency. The highest spectral efficiency can reach 3.692bit/s/Hz.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131791"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional cavity structure-assisted gold nanoparticles for surface-enhanced Raman scattering applications","authors":"Yu Wang ,&nbsp;Hongyan Zhao ,&nbsp;Guangqiang Liu,&nbsp;Cuixia Bi,&nbsp;Sujuan Feng,&nbsp;Tong Shi,&nbsp;Jiacheng Li,&nbsp;Hao Wang","doi":"10.1016/j.optcom.2025.131784","DOIUrl":"10.1016/j.optcom.2025.131784","url":null,"abstract":"<div><div>The effect of surface-enhanced Raman scattering (SERS) depends on the structure of the SERS substrate, and the combination of special substrate structure and Au/Ag nanoparticles is an effective means for SERS. In this study, the bottom funnel head flower-shaped collapse array structure with unique morphology is prepared by improved anodic aluminum oxide (AAO) method, and gold nanoparticle (AuNPs) layers are embedded in the structure to synthesize composite substrates for high-performance Raman signal enhancement. The experimental conditions such as anodic oxidation time, reaming time, gold plating time and annealing time are discussed in detail with 4-aminothiophenol (4-ATP) as probe molecule, the ultra-low concentration detection with molecular concentration of 10⁻¹³ mol/L can be realized. At the same time, the concentration and signal intensity shows a good linear relationship, and the field enhancement factor is as high as 1.24 × 10⁶. The structure of the substrate shows high repeatability, high sensitivity and high uniformity, which has a broad application prospect in the plasma devices based on anodic alumina.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131784"},"PeriodicalIF":2.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of low concentrations of the l-valine solution using high-resolution THz-ATR spectroscopy","authors":"Jixuan Hao ,&nbsp;Liqi Cui ,&nbsp;Jiangkun Tian ,&nbsp;Jingyi Shu ,&nbsp;Guozhong Zhao","doi":"10.1016/j.optcom.2025.131779","DOIUrl":"10.1016/j.optcom.2025.131779","url":null,"abstract":"<div><div>Herein, we developed a terahertz time-domain attenuated total reflection (THz-ATR) system with high spectral resolution. The THz-ATR system has a spectral range of 0.2–2 THz, a signal-to-noise ratio higher than 60 dB, and a spectral resolution of up to 3 GHz. This system detects water-containing samples based on the evanescent wave generated by total reflection and is capable of sensitively recognizing the refractive index of water-containing samples. The quantitative detection of <span>l</span>-valine solutions with a concentration gradient of 100 mM was realized using the proposed system. This study provides novel insights into the quantitative detection of THz-wave water-containing samples.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131779"},"PeriodicalIF":2.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polarization-independent adjustable broadband terahertz metamaterial absorber based on vanadium dioxide rings","authors":"Zishan Yang ,&nbsp;Anqi Li ,&nbsp;Zehua Long ,&nbsp;Feng Huang ,&nbsp;Zhaoyang Chen","doi":"10.1016/j.optcom.2025.131672","DOIUrl":"10.1016/j.optcom.2025.131672","url":null,"abstract":"<div><div>The emergence of polarization insensitive and adjustable terahertz metamaterial absorbers promotes the wide application of terahertz technology. In this paper, an adjustable broadband absorber based on vanadium dioxide (VO₂) is designed. The device adopts a simple sandwich structure: the bottom layer is gold, the medium is quartz, and the top layer consists of three VO₂ rings with gaps. The plasmon resonance generated by the top layer pattern and the coupling effect between the rings jointly lead to the emergence of the broadband absorption spectrum. The absorptivity exceeds 90% within the frequency range of 2.81–7.71 THz, with a bandwidth of 4.9 THz and a relative bandwidth of 93.16%. By varying the thickness of the VO₂ ring and the width of the gaps, the absorptivity can be higher than 95% between 3.17 and 7.50 THz, providing an additional option for industrial applications. Additionally, the proposed absorber is polarization-insensitive, incident stable and has high parametric fault tolerance. When the conductivity of VO₂ changes from <span><math><mrow><mn>2</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> to <span><math><mrow><mn>2</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>5</mn></mrow></msup></mrow></math></span> S/m, the absorptivity at 2.84 THz can continuously vary from 1.44% to 91.91%, and the modulation depth reaches 98.43%. These properties are beneficial for the preparation and application of absorbers. Furthermore, a model based on multiple interference theory is also utilized to verify the absorption spectra of the simulation model. This exploration offers a new alternative for switch, modulator, communication, and other applications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131672"},"PeriodicalIF":2.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sun-tracker PV and TEG hybrid power generation","authors":"V.G. Chaithralakshmi ,&nbsp;P. Anamika ,&nbsp;K.M. Vishnu ,&nbsp;V. Dinesh Kumar ,&nbsp;Della Thomas","doi":"10.1016/j.optcom.2025.131780","DOIUrl":"10.1016/j.optcom.2025.131780","url":null,"abstract":"<div><div>The integration of Photovoltaic (PV) and Thermoelectric Generator (TEG) systems for hybrid power generation has gained considerable attention in recent years due to its potential to enhance energy efficiency and address the challenges of renewable energy intermittency. This paper presents a comprehensive study on the hardware implementation, modeling, and efficiency analysis of a PV and TEG hybrid power generation system. Maximum possible efficiency was achieved for PV panel by means of single-axis Solar Sun Tracker System, which dynamically adjusted its orientation to maximize sunlight exposure. The primary objective of this research is to explore the synergies between PV and TEG technologies in order to optimize power output and overall system efficiency. The proposed hybrid system harnesses solar energy through PV modules and concurrently utilizes waste heat to generate electricity via TEG modules. The experimental validation of the hybrid system is conducted on a prototype setup. The results demonstrate that the integrated PV and TEG system outperforms standalone PV or TEG configurations, achieving higher overall energy conversion efficiency. The experimental outcomes featuring an energy saving of about 30 % by TEG panel on the heat radiated by the solar panel, validate the functionality and promise of the hybrid PV + TEG power generation system. The hybrid approach proves particularly effective in scenarios with fluctuating solar intensity and temperature gradients. MATLAB simulations and hardware experiments were conducted to validate the system's functionality and assess its performance under varying environmental conditions. Reducing thermal resistance between PV cells and TEG module could help keep PV cells optimum temperature for higher Cr (Concentration Ratio) as per MATLAB simulation. The MATLAB graphs depict the power output from both PV and TEG modules, illustrating the dynamic response of the hybrid system to changing solar irradiance levels and temperature gradients. The proposed hybrid system harnesses solar energy through PV modules and concurrently utilizes waste heat to generate electricity via TEG modules. The innovative hardware setup, combined with the control algorithm, resulted in significant improvements in energy generation. The observed results affirm the practical viability of the proposed setup and its potential for real-world applications. This work encourages further exploration of solar tracking technologies for enhanced renewable energy utilization.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131780"},"PeriodicalIF":2.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}