Optics and Laser Technology最新文献

{"title":"High-efficiency dropwise condensation on superhydrophobic conical pillar arrays","authors":"Weihao Pan ,&nbsp;Changxia Liu ,&nbsp;Yushuai Hu ,&nbsp;Wen Cai ,&nbsp;Defeng Yan ,&nbsp;Guanghao Chen ,&nbsp;Jiayu Ou ,&nbsp;Jing Sun","doi":"10.1016/j.optlastec.2025.113156","DOIUrl":"10.1016/j.optlastec.2025.113156","url":null,"abstract":"<div><div>Inspired by nature, superhydrophobic surfaces with special wettability have received considerable attention and shown great application potential in the field of dropwise condensation. However, existing superhydrophobic surfaces for enhancing the condensation collection rate (CCR) are prone to failure at a high surface subcooling temperature, which severely reduces their CCR and service life. Here, superhydrophobic conical pillar arrays (SCPA) with macro, micro, and nano structures were proposed for dropwise condensation. The effects of the dimensional parameters of the SCPA (spacing, top diameter, and height) on the CCR were systematically investigated. In addition, the CCR of the SCPA was investigated at different humidity and surface subcooling temperatures. Experimental and theoretical analyses show that the SCPA can maintain high CCR (47.2 mg/(cm²·h)) for 2 h at a surface subcooling temperature of 16 K because of the special conical pillar structure, which is higher than that of the superhydrophobic flat surface.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113156"},"PeriodicalIF":4.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Principle driven parameterized fiber model based on GPT-PINN neural network","authors":"Yubin Zang ,&nbsp;Boyu Hua ,&nbsp;Zhenzhou Tang ,&nbsp;Zhipeng Lin ,&nbsp;Fangzheng Zhang ,&nbsp;Simin Li ,&nbsp;Zuxing Zhang ,&nbsp;Hongwei Chen","doi":"10.1016/j.optlastec.2025.113037","DOIUrl":"10.1016/j.optlastec.2025.113037","url":null,"abstract":"<div><div>To cater the need of Beyond 5G communications, large numbers of data driven artificial intelligence based fiber models have been put forward as to utilize artificial intelligence’s regression ability to predict pulse evolution in fiber transmission at a much faster speed compared with the traditional split step Fourier method. In order to increase the physical interpretabiliy, principle driven fiber models have been proposed which inserts the Nonlinear Schödinger Equation into their loss functions. However, regardless of either principle driven or data driven models, the whole models need to be re-trained under different transmission conditions. Therefore, those models’ complexity could be larger and computation costs could be higher, especially when dealing with large numbers of different transmission conditions. In order to address this problem, we propose the principle driven parameterized fiber model in this manuscript. This model breaks down the predicted NLSE solutions with respect to different transmission conditions into the linear combinations of several eigen solutions which were outputted by pre-trained eigen solution solvers. Therefore, the model can greatly alleviate the heavy burden of re-training since only the linear combination coefficients need to be found when changing the transmission condition. Not only strong physical interpretability can the model possesses, but also higher computing efficiency can be obtained. The model’s performance is demonstrated by predicting the propagating evolution of pulses with different shapes under 1000 different transmission conditions over the maximum 100 km fiber. Under both theoretic analysis and numerical demonstration, after appropriately trained, this model is able to predict pulses evolution under 1000 different transmission conditions with only 10 selected eigen solutions. Besides, the model’s computational complexity is only 0.0113 % of split step Fourier method and 1 % of the previously proposed principle driven fiber models.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113037"},"PeriodicalIF":4.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Varifocal near-eye display with extended eyebox using dual slit-mirror array","authors":"Jiyun Han ,&nbsp;Woongseob Han ,&nbsp;Jae-Hyeung Park","doi":"10.1016/j.optlastec.2025.113053","DOIUrl":"10.1016/j.optlastec.2025.113053","url":null,"abstract":"<div><div>We present a varifocal near-eye display that overcomes eyebox limitations using a dual slit-mirror array configuration. This approach dynamically adjusts image depth to mitigate the vergence-accommodation conflict and forms a real image of the focus-tunable lens at the eye’s pupil plane, maintaining a constant eyebox size independent of the system’s field of view. Additionally, we introduce a vision correction method for users with refractive errors, enabling clear image observation without prescription lenses, along with an image pre-compensation technique to reduce optical aberrations. Experimental results confirm the feasibility of our design, demonstrating simultaneous expansion of the eyebox and field of view, as well as improved image quality.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113053"},"PeriodicalIF":4.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Michelson interferometer based OSNR monitoring and optimization method for phase-modulated fiber-optic time transfer system","authors":"Rui Zhang,&nbsp;Jiameng Dong,&nbsp;Zhaohui Wang,&nbsp;Guohua Wu,&nbsp;Song Yu,&nbsp;Bin Luo","doi":"10.1016/j.optlastec.2025.113144","DOIUrl":"10.1016/j.optlastec.2025.113144","url":null,"abstract":"<div><div>In long-haul fiber-optic time and frequency (T/F) transfer systems, the accumulation of amplified spontaneous emission (ASE) from amplifiers degrades the optical signal-to-noise ratio (OSNR) of the transmitted signal, thereby affecting the performance of the system. Therefore, we propose a scheme for OSNR monitoring and optimization in fiber-optic time transfer systems. The OSNR monitor exploits the difference in coherence between the signal and the ASE. It employs a Michelson delay line interferometer at the receiver, commonly used to demodulate the phase-modulated time signal (one pulse per second). By adjusting amplifier gains, we achieve optimal OSNR, and the Michelson interferometer continuously monitors OSNR changes to ensure reliable system operation. This scheme was verified over a 480 km laboratory fiber link containing five high-isolation bi-directional erbium-doped fiber amplifiers (HI-BiEDFAs). Experimental results show an SNR improvement of over 7 dB compared to the initial gain settings. The time deviation of the round-trip time transfer system is 18.84 ps at 1 s and 0.90 ps at 10,000 s, showing more than a twofold improvement in short-term stability over the traditional method of maintaining constant output power of HI-BiEDFAs. This scheme offers both pulses demodulation and OSNR monitoring without any additional modules, and the flexible utilization of monitoring data, enabling state awareness across the network—a key technological vision for future applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113144"},"PeriodicalIF":4.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"The effect of process parameters on the high-speed cut quality of Li-ion electrodes using a single mode continuous fiber laser","authors":"Caterina Angeloni,&nbsp;Carolina Magrini,&nbsp;Erica Liverani,&nbsp;Alessandro Fortunato","doi":"10.1016/j.optlastec.2025.113119","DOIUrl":"10.1016/j.optlastec.2025.113119","url":null,"abstract":"<div><div>Coated Al and Cu current collectors are employed in the production of Li-ion batteries (LIBs) serving as cathodes and anodes, respectively. The increasing demand and the need for net zero-defect cutting quality are driving industrial production towards fast and reliable technologies. Laser cutting of LIB electrodes is an efficient and cost-effective alternative to conventional mechanical methods, enabling high accuracy and less damaged active material while maintaining high processing speeds. Thanks to remote laser technology flexibility, several combinations of process parameters, electrode material, and thicknesses of the electrode sandwich have been studied. This material variety discussed in the literature reflects the need of the industry to exploit different solutions. Currently, electrode cutting mainly involves the application of short pulse nanosecond (ns) fiber laser. However, the fast-advancing technology of laser manufacturing (including laser sources, optics and scanning heads) allows for new opportunities to improve process productivity and quality. This study evaluates the interaction between a single mode (SM) continuous wave (CW) source and LIB electrodes, exploring the effects of laser power and scanning speed (up to 11 m/s) on thermal defects. These include clearance width and heat affected zone (HAZ) for the anode, as well as HAZ width and the quantity of spherical defects detached from the aluminum foil for the cathode. This investigation identified a significant reduction of defects for both materials when higher speeds are set. Specifically, high-quality cuts were achieved at 5.5 m/s for the anode and 4.4 m/s for the cathode, with a clearance width kept below 20 μm and HAZ under 30 μm.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113119"},"PeriodicalIF":4.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"BOCDA sensor measurement system for 1 mm spatial resolution at distances over 200 m","authors":"Bo-Hun Choi","doi":"10.1016/j.optlastec.2025.113006","DOIUrl":"10.1016/j.optlastec.2025.113006","url":null,"abstract":"<div><div>Both bit and sub-bit delays were simultaneously applied to twin pseudo random bit sequence (PRBS) codes to establish a correlation between the probe and pump in the Brillouin optical correlation domain analysis (BOCDA) system to generate the stimulated Brillouin scattering (SBS) gain. The bit delay made the BOCDA measurement system simpler and more efficient by eliminating the need for a delay line to determine the measurement position, while the sub-bit delay improve the precision of the measurement point selection. The distorted probe and pump pulses were correlated in a region smaller than one bit by adjusting the bandwidth of the RF amplifier. A dramatic improvement in the spatial resolution of the BOCDA measurement system was achieved through the combination of sub-bit delays and pulse waveform distortion. It has been demonstrated that when a 20 Gbps modulation corresponding to a 5 mm resolution in the conventional method is applied, it is possible to achieve a five-fold improvement, enabling measurements with a 1 mm resolution. This allowed experiments to be performed to achieve a measurement effect equivalent to using a modulation rate above 100 Gbps, which would otherwise incur significant costs or would be difficult to implement in hardware. The BOCDA systems using bit waveform distortion and sub-bit delay technologies was applied to sensing fibers over 200 m. This finest resolution measurement was achieved with less than half the pump power of previous methods, which used a powerful pump power of 1–2 W to achieve a resolution of a few millimeters.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113006"},"PeriodicalIF":4.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Feedback-enhanced distant entanglement of magnon and phonon modes with atomic ensembles in coupled cavities","authors":"Muhammad Awais Altaf ,&nbsp;Muhammad Irfan","doi":"10.1016/j.optlastec.2025.113079","DOIUrl":"10.1016/j.optlastec.2025.113079","url":null,"abstract":"<div><div>The generation and manipulation of distant entanglement between disparate systems are crucial for various quantum technologies. In this work, we investigate a system of coupled cavities comprising an ensemble in cavity-1, a yttrium-iron-garnet (YIG) sphere in cavity-2, and a coherent feedback loop (CFL) that feeds the output of cavity-1 back into cavity-1 through a beam splitter. This system features five excitation modes: cavity-1 photons, atomic ensemble, cavity-2 photons, and the magnon and phonon modes of the YIG sphere. Thus various combinations of bipartite entanglements can be studied. Our main focus is the study of various combinations of distant bipartite entanglements, especially the entanglement of the atomic ensemble and photons in cavity-1 with the magnon and phonon modes of the YIG sphere in cavity-2. Compared to the previously reported results, introducing a CFL significantly enhances all the bipartite entanglements. Besides, the degree of entanglement of various modes, the parameter space, where the strong entanglement exists, is also significantly enhanced due to CFL. Moreover, the entanglement is more robust against thermal noise. We believe our results are important for quantum technologies where the distribution of entanglement on quantum networks is crucial.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113079"},"PeriodicalIF":4.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"New solution for machining deep high-aspect-ratio micro holes based upon picosecond laser layered trepanning","authors":"Houxiao Wang ,&nbsp;Guoqiang Yu ,&nbsp;Wuhong Xin ,&nbsp;Yali Wang ,&nbsp;Xiangyuan Kong","doi":"10.1016/j.optlastec.2025.113107","DOIUrl":"10.1016/j.optlastec.2025.113107","url":null,"abstract":"<div><div>Deep high-aspect-ratio micro holes have been required urgently for manufacturing heat-resistant aero-engine components. Although ultrafast lasers have been proposed and used for machining such holes, the hole depth drilled using a traditional ultrafast laser is quite small. In this work, a new solution, which is based on picosecond laser layered trepanning technique cooperatively modulated by an airflow and an E-field, is accordingly developed to well solve such a challenging problem of small hole depth with a high aspect ratio. Using this hybrid technique, a comprehensive study was systematically conducted to trepan deep high-aspect-ratio micro holes in titanium alloy TC4 workpieces, and the hole-machining performance with mechanism analysis was also demonstrated. It was reported that high-quality deep high-aspect-ratio micro through holes were successfully machined in a workpiece of 5.6 mm thickness and the extreme blind-hole aspect ratio of around 20.8:1 was also achieved by using the new solution proposed, demonstrating its notable potential to greatly increase laser hole-machining depth and aspect ratio. Both horizontal/vertical airflow and E-field further improved the extremely machined depth. The airflow and E-field modulation further increased the extreme hole depth while suppressed oxidation. The airflow plus E-field modulation significantly suppressed residual stress with a maximum averaged reduction percentage of 88.0 %. The airflow used was more effective than the E-field applied to improve microstructure and micro hardness, and the cooperative modulation of an air flow and an E-field further improved micro hardness and microstructure. The problem of notable taper for the extreme through hole trepanned was well solved by using double-side picosecond laser layered trepanning.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113107"},"PeriodicalIF":4.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Pulsating synchronized trichromatic pulse compound based on four-wave mixing effect in a passively mode-locked fiber laser","authors":"Yuansheng Ma,&nbsp;Ziyang Zhang,&nbsp;Pan Wang,&nbsp;Jiangyong He,&nbsp;Yange Liu,&nbsp;Bo Liu,&nbsp;Zhi Wang","doi":"10.1016/j.optlastec.2025.113141","DOIUrl":"10.1016/j.optlastec.2025.113141","url":null,"abstract":"<div><div>The formation of synchronized multi-wavelength pulses in mode-locked lasers is crucial for exploring multi-dimensional soliton dynamics. However, in traditional multi-wavelength mode-locked lasers, pulses of different wavelengths often experience group velocity differences due to dispersion, making synchronization challenging. In this work, we demonstrate that trichromatic pulses can be synchronized within the fiber laser cavity through four-wave mixing (FWM)-induced energy exchange by using a section of zero-dispersion fiber. The resulting synchronized trichromatic pulse compound (STPC) with noisy properties also exhibits pulsating dynamics, where the trichromatic pulses share the same pulsation period. Moreover, asynchronous pulses generated during the energy dissipation processes of the STPC also follow the same pulsation period. Moreover, these pulsating asynchronous pulses, functioning as a self-organizing process, regulate the stability of the pulsating STPC in different ways under different pump powers. This work provides a promising method for studying the dynamics of multi-dimensional dissipative solitons and is expected to promote the related applications of synchronized multi-wavelength mode-locked fiber lasers.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113141"},"PeriodicalIF":4.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Passively mode-locked faraday laser with narrowband spectrum aligned to rubidium atomic transition lines","authors":"Zhihong Gao ,&nbsp;Duo Pan ,&nbsp;Hangbo Shi ,&nbsp;Zhiyang Wang ,&nbsp;Huifang Hou ,&nbsp;Tiantian Shi ,&nbsp;Zhigang Zhang ,&nbsp;Jingbiao Chen","doi":"10.1016/j.optlastec.2025.113145","DOIUrl":"10.1016/j.optlastec.2025.113145","url":null,"abstract":"<div><div>Mode-locked lasers, characterized by their short pulses and broad optical spectra, are extensively utilized in scientific research, precision spectroscopy, and frequency metrology. However, the current multi-frequency laser spectroscopy technology, employed in ultra-stable lasers and atomic clocks, demands laser spectrum to exclusively cover atomic transition lines, which is not satisfied by conventional broad-spectrum mode-locked lasers. Here we present a novel passively mode-locked 780 nm Faraday laser using a 5-torr argon-mixed ⁸⁵Rb atomic filter as a saturable absorber (SA), with narrowband spectrum aligned to the ⁸⁷Rb 5²S_1/2F = 2 → 5²P_3/2 Doppler-broadened transition line. Moreover, the Faraday laser can be switched to a single-frequency mode by adjusting the injection current of the laser diode (LD). The system utilizes a Faraday anomalous dispersion optical filter (FADOF) to achieve precise frequency selection and mode-locking operation. This work demonstrates a novel approach to generating narrowband mode-locked lasers, with potential applications in atomic precision spectroscopy, quantum sensing and frequency metrology.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"189 ","pages":"Article 113145"},"PeriodicalIF":4.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}