Optics and Laser Technology最新文献

{"title":"Negative capacitance in a novel bidirectional p-i-n diode for near-infrared LED and photodetector applications","authors":"Fahrettin Sarcan,&nbsp;Aydin Masoumi,&nbsp;Goksenin Kalyon,&nbsp;Ayse Erol","doi":"10.1016/j.optlastec.2025.113207","DOIUrl":"10.1016/j.optlastec.2025.113207","url":null,"abstract":"<div><div>In this study, the negative capacitance (NC) phenomena is investigated in a GaInNAs/GaNAs-based bidirectional multi-quantum well p-i-n junction device designed for both light-emitting diode (LED) and photodetector, for near-infrared telecom applications. The device was grown by molecular beam epitaxy (MBE) with a structure comprising nine GaInNAs/GaNAs quantum wells with 15 periods of GaAs/AlAs distributed Bragg reflector (DBR) as bottom mirror. Photoluminescence (PL), electroluminescence (EL), and spectral photocurrent measurements confirm device operation within the telecom O-band, with emission and detection centred at 1280 nm and a narrow full-width at half-maximum (FWHM) of 65 nm. The NC capacitance is observed in both the forward and the reverse bias conditions. The NC effect observed under forward bias is attributed to radiative recombination, while under reverse bias it is driven by defect-related carrier trapping and impact ionization mechanisms. These results provide a detailed understanding of NC mechanisms in multi quantum well p-i-n junctions diode structures.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113207"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070262","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 feasibility study of direct measurement of gas concentration in gas-liquid mixed phase by using photoacoustic spectrometry","authors":"Hongquan Zheng ,&nbsp;Yu Sui ,&nbsp;Bo Wang ,&nbsp;Yunlong Li ,&nbsp;Mingxue Huo ,&nbsp;Tianqi Wang ,&nbsp;Chaoming Liu ,&nbsp;Yanqing Zhang ,&nbsp;Guoliang Ma ,&nbsp;Chunhua Qi","doi":"10.1016/j.optlastec.2025.113132","DOIUrl":"10.1016/j.optlastec.2025.113132","url":null,"abstract":"<div><div>Nowadays, the measurement of gas concentration in gas–liquid mixed solutions based on photoacoustic spectroscopy technology calls for a degassing device in which the gas dissolved in the liquid can be degassed. However, there is no in-depth study on the method of measuring gas concentration in mixed solutions directly. In this paper, the mathematical relationship between the gas photoacoustic signal and its concentration is established with the liquid forced to vibrate as a pressure medium when the energy generated by gas due to absorption of frequency light radiation is considered as local thermal energy. What’s more, an experimental platform is built based on this relationship, which is also applied to conduct experimental study. This study was conducted to verify the feasibility of photoacoustic spectroscopy technology used in direct measurement of gas concentration in gas–liquid mixed solutions, which was conducted in terms of three aspects: the theory of photoacoustic spectroscopy technology, the construction of experimental platform, simulation and the experimental analysis.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113132"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069461","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":"Enhancing object recognition for lensless cameras through PSF correction and feature loss","authors":"Kaiyu Chen ,&nbsp;Ying Li ,&nbsp;Zhengdai Li ,&nbsp;Jiangtao Hu ,&nbsp;Youming Guo","doi":"10.1016/j.optlastec.2025.113077","DOIUrl":"10.1016/j.optlastec.2025.113077","url":null,"abstract":"<div><div>Lensless cameras have significant application prospects in multiple specialized fields due to their unique advantages of small size, low cost, and a naturally optical encryption effect. However, achieving high-accuracy object recognition in complex scenarios remains a challenging task. Firstly, many factors in the actual imaging process can induce the point spread function (PSF) distortion, resulting in a mismatch between the ideal model and the experiment. In this study, these factors are equivalently regarded as a blur kernel. Based on the singular value decomposition (SVD) results of the blur kernel, a lightweight and interpretable PSF correction network is proposed to counteract this blur kernel. Then, inspired by the class activation mapping (CAM) of classification networks, a feature loss function is proposed to indirectly achieve the reconstruction of local regions that play a crucial role in recognition by seeking feature layers alignment. Based on these, a series of incremental network models that integrate physical models and deep learning are designed, which achieve significantly better performance than other advanced methods on the cats_vs_dogs and ImageNet_10 datasets, and also show good generalization in the recognition test of real-world scenes. The proposed method significantly improves the object recognition performance of lensless cameras and has the potential for application in complex scenarios. The codes will be available at <span><span>https://github.com/fylr/WienerNet_lensless</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113077"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070263","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":"Residual tensile stress mitigation and surface hardness enhancement in Ti6Al4V alloy via elevated temperature laser surface melting","authors":"Rama Balhara,&nbsp;Justin Hijam,&nbsp;Adarsh V Jose,&nbsp;Madhu Vadali","doi":"10.1016/j.optlastec.2025.113177","DOIUrl":"10.1016/j.optlastec.2025.113177","url":null,"abstract":"<div><div>Laser surface melting (LSM) is a versatile technique used to modify surface properties without affecting the bulk characteristics of materials. This paper investigates the effects of LSM with pre-heating at different temperatures on the induced residual tensile stresses, hardness, and surface topography of Ti6Al4V alloy. A finite element-based numerical model is developed to analyse the cooling rate during the process. Cooling rates decrease, and melt pool dimensions increase in LSM at elevated temperatures. This decreases the residual tensile stresses and increases the microhardness. Experimental results reveal that higher pre-heating temperatures lead to up to 42 % reduction in residual tensile stress and up to 25 % improvement in microhardness, with minimal effect on surface topography. This study highlights the efficacy of elevated temperature LSM to mitigate residual tensile stresses and enhance surface hardness, which is promising for defence, aerospace, and automotive applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113177"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070259","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":"Advances in fiber-optic-based 3D shape sensing technology","authors":"Haodi Zhai ,&nbsp;Qi Wang ,&nbsp;Bing Zhou ,&nbsp;Yijie Fan ,&nbsp;Fuyin Wang ,&nbsp;Qiong Yao ,&nbsp;Ji Xia","doi":"10.1016/j.optlastec.2025.113190","DOIUrl":"10.1016/j.optlastec.2025.113190","url":null,"abstract":"<div><div>Fiber-optic 3D shape sensing technology, renowned for its immunity to electromagnetic interference and unparalleled spatial accuracy, is indispensable for real-time deformation monitoring in demanding and intricate environments. This study delves into the sensing mechanisms of both multi-core fibers (MCFs) and fiber bundle configurations. It examines quasi-distributed sensing approaches, including fiber Bragg gratings (FBGs), and addresses mitigation techniques for temperature-strain cross-sensitivity. A comparative analysis of distributed sensing methods, such as Brillouin and Rayleigh scattering, is presented, emphasizing their distinct performance characteristics. Furthermore, the paper systematically outlines shape sensing algorithms, focusing on curvature and shape reconstruction, and explores torsion demodulation techniques, underscoring the transformative impact of machine learning in enhancing reconstruction precision and computational efficiency. Lastly, it highlights critical challenges in distributed fiber-optic shape sensing (DFOSS) and outlines future research trajectories, providing a holistic overview of the technology’s current landscape and its potential for groundbreaking advancements.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113190"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070777","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":"Study of near-infrared semiconductor laser irradiation of biological skin tissues for non-lethal laser thermal dispersion","authors":"Rui Zhang ,&nbsp;Zhenfu Wang ,&nbsp;Xiaohui Li ,&nbsp;Te Li ,&nbsp;Fang Peng ,&nbsp;Junyue Zhang ,&nbsp;Jiachen Liu ,&nbsp;Shunhua Wu ,&nbsp;Weizhou Huang ,&nbsp;Xiwei Huang ,&nbsp;Lei Ling ,&nbsp;Qingkai Meng ,&nbsp;Lang Chen ,&nbsp;Jiachen Zhang","doi":"10.1016/j.optlastec.2025.113189","DOIUrl":"10.1016/j.optlastec.2025.113189","url":null,"abstract":"<div><div>Non-lethal lasers have attracted considerable interest in both military and biomedical applications owing to their diverse range of functionalities, with thermal dispersion being one prominent application. However, investigations into the interaction mechanisms between non-lethal thermal dispersive lasers and biological tissues remain limited. In this study, a four-layer tissue model representing the biological structure of skin is developed, and the thermal effects of different laser beams on skin tissues are analysed. The dispersion and damage thresholds under laser irradiation are determined using the modified Beer-Lambert law and the Arrhenius equation. Validation through simulation and experimentation, the thermal dispersal threshold of 976 nm laser is measured to be 9.18 W/cm². The paper provides an in-depth explanation of the dynamic equilibrium phenomenon in skin tissue temperature under laser irradiation, incorporating the light source, heat source, blood perfusion, and the multilayer tissue model. This work elucidates the fundamental mechanisms of laser-induced heat diffusion in biological skin tissues, offering valuable insights for the future development of laser-based heat diffusion technologies.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113189"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070260","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":"Dual-plane augmented reality integral imaging 3D display system based on reflective polarizer and holographic optical element","authors":"Yuan-Yi Huang ,&nbsp;Yan Xing ,&nbsp;Xue-Rui Wen,&nbsp;Min-Yang He,&nbsp;Fan Chu,&nbsp;Qiong-Hua Wang","doi":"10.1016/j.optlastec.2025.113173","DOIUrl":"10.1016/j.optlastec.2025.113173","url":null,"abstract":"<div><div>We propose a dual-plane augmented reality (AR) integral imaging 3D display system based on reflective polarizer and holographic optical element (HOE), achieving a partly full-color display with a simple structure to enhance viewing experience. The system consists of an integral imaging 3D display, a polarizer, a polarization converter, and a combiner consisting of a reflective polarizer and an HOE. Polarization multiplexing and time-division multiplexing methods are used to create two depth planes. A prototype is designed and constructed to prove the feasibility of the proposed system. The prototype can achieve a dual-plane AR 3D display by creating two depth planes at 600 mm in full-color and 1200 mm in green behind the combiner. The proposed method is expected to be applied to medical treatment, education, entertainment, and other fields.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113173"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069464","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":"Effect of laser power on stability of pulsed laser-arc hybrid welding process for 6082-T6 aluminum alloy","authors":"Jinquan Guo,&nbsp;Haizhou Li,&nbsp;Rui Su,&nbsp;Wantong Wang,&nbsp;Rui Lu,&nbsp;Xingyi Ruan,&nbsp;Hui Chen","doi":"10.1016/j.optlastec.2025.113126","DOIUrl":"10.1016/j.optlastec.2025.113126","url":null,"abstract":"<div><div>In this study, the effect of laser power on the stability of pulsed laser-MIG hybrid welding (PLMHW) process for 6082-T6 aluminum alloy was studied. The porosity of weld metal (WM) was significantly reduced by 2.35 % at the laser power of 5.4 kW (P_5.4); and the welded joints were more well formation and no obvious defects. The formation of pores in the welding process was related to the arc electrical signal, which affects the droplets transfer. The results showed that the electrical signals of laser power 5.0 kW (P_5.0) and laser power 5.8 kW (P_5.8) fluctuate greatly, while P_5.4 was more stable. The droplets transfer modes of P_5.0 and P_5.8 were “one pulses-two droplets” and “two pulses-one droplet”, respectively, which affected the keyhole stability. At P_5.4, the droplets size was moderate, the heat input was reasonable, and the transition frequency was stable, showed “one droplet-one pulse”, which helped to reduce keyhole fluctuations, promote gas escape, and reduced porosity. The results of microhardness showed that the hardness of WM, heat affected zone (HAZ) and base metal (BM) was about 77 Hv, 85 Hv and 95 Hv respectively. The hardness increased from WM to BM, and the hardness of weld center was the lowest due to coarse dendrite. The tensile strength of P_5.4 welded joint at room temperature was 235.62 MPa, the yield strength was 159.57 MPa, and the elongation was 14.29 %. Scanning electron microscopy (SEM) showed that the tensile fracture of P_5.0 and P_5.8 had less dimples, cleavage planes and tearing edges, and the joint performance was poor. PLMHW was applied to 6082-T6 aluminum alloy to investigate the influence of laser power variations on welding process stability. This study provided additional guidance for optimizing processing parameters in PLMHW and established correlations between droplet transfer modes and welded joint performance.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113126"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070258","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":"Novel circularly polarized two-color quantum well infrared photodetectors based on dual dielectric column arrays","authors":"Bo Cheng ,&nbsp;Yuxiao Zou ,&nbsp;Zihui Ge ,&nbsp;Kunpeng Zhai ,&nbsp;Guofeng Song","doi":"10.1016/j.optlastec.2025.113129","DOIUrl":"10.1016/j.optlastec.2025.113129","url":null,"abstract":"<div><div>Complex environments such as underwater, haze, and backlighting require detectors with exceptional target recognition capabilities. However, neither single-polarization detection nor multi-color detection technology can fully address this challenge. Thus, integrating these two technologies emerges as a promising solution. We propose a pioneered photonic device capable of simultaneously detecting circularly polarized light and two-color signals. The device comprises a periodic array of two different GaAs pillars and a two-color quantum well infrared photodetector (QWIP). The circular dichroism of the polarized two-color QWIP reaches 0.33 at 8.5 µm and 0.26 at 10.5 µm. This design bridges the gap in simultaneous polarized and multi-color signal detection, potentially pioneering a new generation of infrared detectors.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113129"},"PeriodicalIF":4.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069463","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":"Deformation behaviour, microstructural evolution and mechanical property of the shaped parts fabricated by laser shock forming with different laser energy","authors":"Yan Zhang ,&nbsp;Xingquan Zhang ,&nbsp;Kankan Ji ,&nbsp;Junsheng Qin ,&nbsp;Lisheng Zuo ,&nbsp;Ziyu Wang","doi":"10.1016/j.optlastec.2025.113172","DOIUrl":"10.1016/j.optlastec.2025.113172","url":null,"abstract":"<div><div>Laser shock forming (LSF) is a promising technique for fabricating thin-walled microparts with complex geometries in microelectromechanical systems (MEMS). This work investigated the formation of cup-shaped parts via LSF under varying laser energies (4, 5, and 6 J). Finite element analysis was employed to systematically model the material deformation behaviors during LSF. Subsequently, microstructure evolution and mechanical properties of both undeformed and LSFed samples were analyzed using electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and nanoindentation test. The topography of formed cup-shaped parts indicates that the highest forming accuracy was achieved at 5 J laser energy. Microstructural characterization of both central and bottom corner regions of cup-shaped part revealed distinct trends with increasing laser energy. In the central regions, the average grain size first decreased and then increased at higher energy levels, while the proportion of low-angle grain boundaries (LAGBs) and geometrically necessary dislocation (GND) density increased then declined. In contrast, the bottom corner regions displayed progressive grain refinement along with a steady increase in LAGBs and GND density. Texture analysis indicated minimal changes in the central region, while the bottom corner subjected to 6 J exhibited a transition from the primary cubic texture {001} &lt;100&gt; to Goss texture {011} &lt;100&gt;. A substantial number of dislocation structures, including dislocation lines, tangles, walls, and cell blocks, were predominantly distributed across both the central and bottom corners of the LSFed cup-shaped parts. The part formed at 5 J demonstrated optimal mechanical performance, attributed to strain-hardening effect for copper, coupled with dislocation accumulation and twin formation. Notably, the microhardness values at the bottom corners generally exceeded those at the central locations.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113172"},"PeriodicalIF":4.6,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948301","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}