Liyong Dai , WenSheng Huang , Chunbo Su , Vladimir R. Tuz , Tao Geng
{"title":"Probe-based fiber sensor with PDMS/Mxene coating technology for antibiotic detection","authors":"Liyong Dai , WenSheng Huang , Chunbo Su , Vladimir R. Tuz , Tao Geng","doi":"10.1016/j.optlastec.2025.113379","DOIUrl":"10.1016/j.optlastec.2025.113379","url":null,"abstract":"<div><div>The widespread use of antibiotics has led to antibiotic residues in water bodies, which is a serious threat to human health and ecosystems. In this study, we propose a fiber sensor based on a Polydimethylsiloxane (PDMS)/Mxene composite coating to detect antibiotic concentration in water by photothermal effect. The Mxene material provides abundant adsorption sites due to its large specific surface area, while the PDMS is an excellent temperature conversion substrate with high thermo-optic coefficient, which achieves a high sensitivity of detection. Under the irradiation of 365 nm laser light, antibiotic molecules absorb photon energy and convert it into thermal energy, triggering a change in the refractive index of the PDMS material, which alters the transmission characteristics of the bent optical fiber. The sensor demonstrated excellent performance in susceptibility testing of antibiotics, with fast response over a time range of minutes and good repeatability and stability. The photothermal sensor greatly simplifies the sample handling process and provides strong technical support for public health and environmental protection.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113379"},"PeriodicalIF":4.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279138","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}
N. Nedyalkov , Ru. Nikov , Ro. Nikov , A. Dikovska , N. Stankova , P. Atanasov , G. Atanasova , L. Aleksandrov , K. Grochowska , J. Karczewski , M. Terakawa
{"title":"Laser-induced gold and silver nanoparticle implantation in glass for fabrication of plasmonic structures with multiple use","authors":"N. Nedyalkov , Ru. Nikov , Ro. Nikov , A. Dikovska , N. Stankova , P. Atanasov , G. Atanasova , L. Aleksandrov , K. Grochowska , J. Karczewski , M. Terakawa","doi":"10.1016/j.optlastec.2025.113361","DOIUrl":"10.1016/j.optlastec.2025.113361","url":null,"abstract":"<div><div>In this work the method of laser induced reverse transfer is applied for a stabile implantation of gold and silver nanoparticles into glass substrate. The method is based on laser ablation of gold and silver targets covered by soda-lime glass. The experiments are performed using nanosecond laser pulses at wavelength of 1064 nm. The illumination of the target through the glass side results in ablation and embedding of the ablated material into the glass. At certain conditions the implantation process is highly efficient as multiple washing of the substrate with water and even a wiping do not remove the deposited material. Detailed analyses of the processed area are performed in order to clarify the morphology, composition and the structure of the material. The mechanisms of nanoparticle formation and their embedding is discussed on a basis of heat diffusion model describing the evolution of the temperature during laser interaction. Application of the formed structures in Surface Enhanced Raman Spectroscopy (SERS) is demonstrated, as a high-sensitive detection of Ammonium nitrate and organic dyes is obtained. Multiple use of the obtained materials in SERS is also evidenced.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113361"},"PeriodicalIF":4.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288877","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}
Lihailiang Xu , Wenzhi Wang , Liming Gao , Zhihao Li , Zexu Liu , Hongzhen Wang , Yangjian Cai , Yuan Wan
{"title":"Photothermal microbubble-driven control of graphene-based random lasers","authors":"Lihailiang Xu , Wenzhi Wang , Liming Gao , Zhihao Li , Zexu Liu , Hongzhen Wang , Yangjian Cai , Yuan Wan","doi":"10.1016/j.optlastec.2025.113387","DOIUrl":"10.1016/j.optlastec.2025.113387","url":null,"abstract":"<div><div>Random lasers have significant applications in various fields, including biomedical imaging, optical sensing, anti-counterfeiting technology, optical communication, and high-resolution displays. This study investigates the emission characteristics of graphene-based random lasers, specifically focusing on the control<!--> <!-->achieved<!--> <!-->through the formation of microbubbles induced by photothermal effects. The results show that the peak intensity of the random laser in sample 1 increases from 17.7 a.u. to 26.5 a.u. as the pump time extends from 0 s to 10 s. At the pump time of 10 s, the peak intensity and quality factor of the random laser are about 1.5 and 2.33 times larger than those at 0 s, respectively. However, when the pump time exceeds 10 s, the emission intensity of random lasers starts to weaken. These phenomena are attributed to the production of microbubbles, whose presence is confirmed by the dual-beam Z-scan technique and the dynamic behavior of graphene microsheets. Microbubbles not only enhance light scattering but also provide a new dimension for controlling random lasing. Additionally, by adjusting the concentration of polyvinyl alcohol in the suspension, we can control the formation of microbubbles, and further regulate the emission properties of random lasers. This research presents a novel approach for manipulating random lasers, and showcases the potential of photothermally induced microbubbles for laser control and micro- or nanoparticle manipulation.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113387"},"PeriodicalIF":4.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288878","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}
Long Zhang , Jianjun Yu , Xiongwei Yang , Jianyu Long , Chengzhen Bian , Jingtao Ge , Min Zhu , Jiao Zhang , Kaihui Wang , Wen Zhou
{"title":"Beyond 60G SSB-FBMC signals transmission for Fiber-THz integrated system using simplified parallel Kramers-Kronig receiver","authors":"Long Zhang , Jianjun Yu , Xiongwei Yang , Jianyu Long , Chengzhen Bian , Jingtao Ge , Min Zhu , Jiao Zhang , Kaihui Wang , Wen Zhou","doi":"10.1016/j.optlastec.2025.113362","DOIUrl":"10.1016/j.optlastec.2025.113362","url":null,"abstract":"<div><div>Simplifying coherent detection technology is a potential solution to save the cost of receivers in ultra-high data rate photon-assisted terahertz (THz) communication systems. A key issue when using an envelope detector to simplify the system is that the generation of signal-signal beat interference (SSBI) reduces the signal-to-noise ratio. The Kramers-Kronig (KK) receiver can effectively eliminate SSBI. In this paper, we propose and demonstrate a simplified parallel KK (SP-KK) receiver. The key idea is to use the Taylor expansion approximation instead of the nonlinear operation that significantly broadens the spectrum, and to use a multiplier-free finite impulse response (FIR) filter to approximate the Hilbert transform (HT). We evaluate the performance of the proposed SP-KK receiver in a single-channel 63.1 Gb/s transmission at 0.1 THz over 10-km wired and 3-m wireless links by using the envelope detection for 16-QAM filter bank multicarrier (FBMC) signals. The experimental results show that the proposed SP-KK receiver exhibits similar performance to the conventional HT-based KK (HT-KK) receiver.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113362"},"PeriodicalIF":4.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279137","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":"A meta-heuristic evolutionary algorithm combined with XGBoost to predict the geometry characteristics of laser-based micro-milling in PMMA-based microchannels","authors":"Abdul Khalad , Aakif Anjum , S.S. Akhtar , A.A. Shaikh","doi":"10.1016/j.optlastec.2025.113347","DOIUrl":"10.1016/j.optlastec.2025.113347","url":null,"abstract":"<div><div>Laser beam micro-milling is a non-contact advanced machining process that is highly precise, flexible, versatile, and cost-effective. In this study, microchannels in polymethyl methacrylate (PMMA) were fabricated using a CO<sub>2</sub> laser with varying input parameters, including laser power, cutting speed, and the number of passes. The focus was on evaluating Kerf Depth (KD) and Kerf Deviation (KDev). This study proposes a hybrid machine learning framework that combines XGBoost with Particle Swarm Optimization (PSO) for accurate prediction of KD and KDev in multi-pass CO<sub>2</sub> laser micromachining of PMMA. The motivation is to develop a lightweight, interpretable model that can offer reliable predictions without the need for extensive DOE. A total of 36 experimental trials were conducted under varying laser power (30–40 W), scanning speeds (20–25 mm/s), and number of passes (1–4). The collected data was used to train an XGBoost model, with PSO optimizing the hyperparameters. SHAP analysis revealed that the number of passes predominantly influenced kerf depth due to cumulative thermal effects, followed by laser power, which governed energy input and vaporization rate. Scanning speed affected dwell time and heat accumulation. The model showed high prediction accuracy for both KD and KDev (R<sup>2</sup> = 0.99, MSE ≈ 0.04). A graphical user interface (GUI) was created to allow real-time predictions and assist in process planning. The proposed framework provides a cost-effective tool for predicting kerf geometry. It has practical use in microfabrication. Future work will focus on applying this model to other materials and laser settings.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113347"},"PeriodicalIF":4.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279136","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":"Stresses numerical analysis of oscillating laser welding in aluminum alloys based on the equivalent fluid–structure interactions model","authors":"Zhaoyang Wang, Peiqing Yang, Wei Liao, Laihege Jiang, Suning Zhao, Yuxing Liu, Ming Gao","doi":"10.1016/j.optlastec.2025.113365","DOIUrl":"10.1016/j.optlastec.2025.113365","url":null,"abstract":"<div><div>Residual stress constitutes an essential parameter for evaluating the operational reliability of welded components. While oscillating laser welding demonstrates notable benefits, including superior weld morphology, diminished porosity, optimized grain refinement, and augmented mechanical characteristics, its influence on residual stress distribution remains insufficiently characterized. This study develops a stress numerical model specifically for oscillating laser welding processes, demonstrating a coefficient of fitting degree greater than 90 %. Additionally, an equivalent fluid–structure interactions model is introduced, accounting for the convective heat transfer of the molten material caused by the laser beam’s stirring effect. This model improves the fusion depth fitting to 97.1 %. Using this model, the evolution and distribution of residual stresses in oscillating laser welding are analyzed. The findings reveal that residual stresses are primarily concentrated at the top of the weld, with transverse and longitudinal residual stresses being predominant. Transverse stresses are mostly tensile, while longitudinal stresses are mainly compressive. Furthermore, the oscillating laser beam was found to be effective in reducing the area of high residual tensile stress distribution in the centre of the weld, where the longitudinal area of distribution was reduced by 3.3 %, and the transverse area of distribution was reduced by 7.3 %.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113365"},"PeriodicalIF":4.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288745","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}
Yifeng Luo , Ke Li , Bowen Chen , Shuxun Cui , Jing Ni , Jindong Wang , Zhenbing Cai
{"title":"Parameters optimization for laser shock peening without coating based on SSA-SVR and GA","authors":"Yifeng Luo , Ke Li , Bowen Chen , Shuxun Cui , Jing Ni , Jindong Wang , Zhenbing Cai","doi":"10.1016/j.optlastec.2025.113368","DOIUrl":"10.1016/j.optlastec.2025.113368","url":null,"abstract":"<div><div>Laser shock peening without coating, as a typical surface strengthening technology, can effectively enhance the abrasion resistance of key components of aero-engine, and the reasonable selection of process parameters is the key to improving the abrasion resistance. In this paper, laser energy, spot diameter, overlapping rate, and impact number were used as test factors to construct a prediction model of wear rate using the machine learning method and response surface method (RSM), respectively, and process parameters were optimized with the objective of minimum wear rate. The results reveal that the response surface approach is challenging to depict the complicated, nonlinear connection between process factors and wear rate, and the prediction accuracy and objective optimization results are unsatisfactory. In contrast, the support vector regression (SVR) model optimized based on sparrow search algorithm (SSA) showed better results after being optimized by genetic algorithm (GA). The optimized wear rate is decreased by 20.11 % under the best process parameters and the wear resistance of the material is significantly improved. The proposed optimization method of laser shock peening without coating process parameters can significantly improve the resistance to fretting wear of the material.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113368"},"PeriodicalIF":4.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279140","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}
Yaping Huang , Zhen Wu , Jianshe Ma , Shuming Jiao , Ping Su
{"title":"Fast high-precision hologram generation based on low-precision hologram enhanced by deep learning","authors":"Yaping Huang , Zhen Wu , Jianshe Ma , Shuming Jiao , Ping Su","doi":"10.1016/j.optlastec.2025.113344","DOIUrl":"10.1016/j.optlastec.2025.113344","url":null,"abstract":"<div><div>Fast computer-generated holography (CGH) calculation is a critical issue in holographic three-dimensional (3D) display. Analytical methods can be used to generate high-precision holograms but the amount of calculation is very heavy. Deep-learning-based CGH methods have made significant progress but they are difficult to deal with 3D point-cloud object model. We propose a novel scheme that combines a simplified analytical method, accurate phase-added stereograms (APAS), with Complex-Valued Convolutional Neural Network (CCNN) to achieve fast generation of holograms from 3D point-clouds. By using APAS to fast generate low-precision holograms from point-clouds, and then using CCNN to restore the degraded holograms, the APAS algorithm can improve the computational speed of hologram generation, and CCNN can ensure the high precision of holograms. By combining the advantages of these two methods, our proposed scheme can achieve a balance between CGH calculation speed and precision. Our proposed scheme is verified by simulated and experimental results.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113344"},"PeriodicalIF":4.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280316","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}
Yury E. Geints , Victor O. Kompanets , Alexander V. Kireev , Sergey V. Chekalin
{"title":"Peculiarities of supercontinuum generation in high-pressure He, N2, Ar, and CO2 gases","authors":"Yury E. Geints , Victor O. Kompanets , Alexander V. Kireev , Sergey V. Chekalin","doi":"10.1016/j.optlastec.2025.113370","DOIUrl":"10.1016/j.optlastec.2025.113370","url":null,"abstract":"<div><div>The generation of coherent optical radiation with an anomalously broadened spectral content (supercontinuum) during the nonlinear propagation of high-power femtosecond laser pulses in transparent media, including high-pressure gases, holds considerable practical interest for the obtaining of extremally ultrashort (attosecond) optical pulses. This capability is crucial for advancing modern attosecond spectroscopy and the study of matter under extreme conditions. In this work, we report the results of systematic experiments on the generation of broadband supercontinuum in an optical cell filled with various atomic and molecular gases (He, Ar, N<sub>2</sub>, CO<sub>2</sub>) at pressures ranging from 1 to 50 bar achieved through the focused filamentation of 40 fs pulses from a titanium-sapphire laser. Our measurements demonstrate that, with the exception of helium, all supercontinuum spectra exhibit similar pressure-dependent behavior: an initial strong spectral broadening is followed by saturation of the spectral bandwidth and, in the case of CO<sub>2</sub>, even a noticeable reduction relative to its maximum achievable width. To elucidate these findings, we carry out theoretical simulations based on the unidirectional propagation equation for an ultrashort wave packet (UPPE). This analysis reveals that the most likely explanation for the observed effects is the enhanced role of kinetic processes, such as absorption and refraction of the laser pulse within the self-generated plasma as the gas pressure increases. These findings provide valuable insights into the mechanisms governing supercontinuum generation in high-pressure gaseous media.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113370"},"PeriodicalIF":4.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280317","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}
Zeyue Gao , Teng Deng , Congyi Wu , Youmin Rong , Guojun Zhang , Yu Huang
{"title":"Precision cutting of the ABS film by ultraviolet picosecond laser","authors":"Zeyue Gao , Teng Deng , Congyi Wu , Youmin Rong , Guojun Zhang , Yu Huang","doi":"10.1016/j.optlastec.2025.113325","DOIUrl":"10.1016/j.optlastec.2025.113325","url":null,"abstract":"<div><div>Precision cutting of the acrylonitrile–butadiene–styrene (ABS) film by ultraviolet (UV) picosecond laser can expand its applications. However, the cutting mechanism is unclear, and the cutting process needs to be optimized. ABS film was cut by a 355 nm picosecond laser with a maximum power of 30 W to study its mechanism and process. On the one hand, a laser material interaction mechanism analysis method based on the simulation and characterization of byproducts is proposed. The mechanism is dominated by photochemical reaction and synergized by the photothermal effect. On the other hand, a cutting quality evaluation system is established to explore the influence of processing parameters on processing quality through orthogonal tests. Based on the cutting mechanism, a cutting process optimization method is developed by suppressing the thermal effect through cutting speed and power. When the parameter combination was set to 80 mm/s-1.63 W-3 times (cutting speed, laser power, and repetition number of laser cutting), a narrow kerf (26.4 ± 3.2 μm) and HAZ (25.3 ± 2.8 μm) were obtained. This result indicates that UV picosecond laser cutting of ABS films exhibits micron-level precision, making it suitable for manufacturing precision components in the electronics and aerospace sectors.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"191 ","pages":"Article 113325"},"PeriodicalIF":4.6,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280315","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}