Optics and Lasers in Engineering最新文献

{"title":"Image cryptography algorithm based on a new composite chaotic system and Latin square collaborative mechanism","authors":"Anhong Tian ,&nbsp;Zhongze Yue ,&nbsp;Chengbiao Fu","doi":"10.1016/j.optlaseng.2025.109084","DOIUrl":"10.1016/j.optlaseng.2025.109084","url":null,"abstract":"<div><div>Encryption algorithms based on chaos theory have become a prominent research focus in the field of information security. However, existing chaotic systems exhibit several limitations, including discontinuous chaotic intervals, low complexity of chaotic signals, and insufficient robustness in their dynamical behavior. These deficiencies pose potential risks to the application of chaotic cryptography. To address these issues, this paper proposes a universal two-dimensional composite hyperchaotic system model (2D-CHS). Through rigorous theoretical analysis, it is demonstrated that the number of positive Lyapunov exponents (<em>LEs</em>) in 2D-CHS is always equal to its dimensionality, indicating the existence of infinitely many coexisting attractors and strong robustness against dynamical degradation. To validate the effectiveness of the proposed 2D-CHS, three one-dimensional chaotic maps are first employed as seed maps to construct three 2D chaotic mappings as representative examples. Evaluation and experimental results demonstrate that the newly generated chaotic maps exhibit broader and more continuous chaotic intervals than traditional chaotic maps, and they also outperform existing systems in terms of <em>LEs</em>, the <em>0–1 t</em>est, sample entropy (<em>SE</em>), permutation entropy (<em>PE</em>), and correlation dimension (<em>CD</em>). Furthermore, a digital circuit implementation scheme based on a microcontroller is designed to verify the practical feasibility and physical realizability of the proposed system. Finally, the novel 2D chaotic system is integrated with Latin square matrices to develop a high-efficiency image encryption algorithm. Experimental results confirm that the algorithm demonstrates excellent efficiency and security performance.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109084"},"PeriodicalIF":3.5,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on tunable laser power amplification for fiber grating sensing demodulation","authors":"Jingjing Liao ,&nbsp;Yuexin Li ,&nbsp;Jingtao Xin ,&nbsp;Lianqing Zhu ,&nbsp;Mingli Dong ,&nbsp;Peng Tian","doi":"10.1016/j.optlaseng.2025.109118","DOIUrl":"10.1016/j.optlaseng.2025.109118","url":null,"abstract":"<div><div>To solve the problem of tunable semiconductor lasers in a multichannel Fiber Bragg Grating (FBG) real-time demodulation system, where the milliwatt output power limits channel expansion, a seed optical power amplification method was proposed. An MG-Y tunable semiconductor laser was used as the seed light source, and a single-pass forward erbium-doped fiber amplifier (EDFA) was employed as the amplifier. By optimizing the laser diode (LD) power, seed-light injection power, and erbium-doped fiber length, a laser output power of 199.5 mW was achieved, proving the feasibility of applying the method to a multichannel real-time demodulation system. To investigate the reliability of the power amplification light source applied to a multichannel real-time demodulation system, the output wavelength stability, bandwidth, and response time of the seed light and power amplifier light source were characterized. The results show that the stability of the seed light and power amplifier light source wavelength was ±2.5 pm and ±2.8 pm, respectively. However, although the wavelength stability of the power amplifier light source deteriorates slightly, it can be effectively improved by algorithm compensation. In general, the power amplification method not only significantly improves the seed light power but also maintains the stability of the seed light spectral performance and has mode suppression effects. Employing this study, it is expected that the number of demodulator channels can be expanded by a factor of 10, providing significant technical support for the realization of real-time demodulation of more channels.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109118"},"PeriodicalIF":3.5,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced fundamental mode stability of VCSEL based on optical feedback from an on-chip external cavity","authors":"Yuehui Xu ,&nbsp;Jianwei Zhang ,&nbsp;Tianjiao Liu ,&nbsp;Yinli Zhou ,&nbsp;Xing Zhang ,&nbsp;Zhuo Zhang ,&nbsp;Chao Chen ,&nbsp;Hao Wu ,&nbsp;Siqi Liu ,&nbsp;Tongqing Liu ,&nbsp;Jingfei Mu ,&nbsp;Xia Liu ,&nbsp;Yongqiang Ning ,&nbsp;Lijun Wang","doi":"10.1016/j.optlaseng.2025.109091","DOIUrl":"10.1016/j.optlaseng.2025.109091","url":null,"abstract":"<div><div>This study investigates the stable single-mode operation of a vertical-cavity surface-emitting laser (VCSEL) integrated with an on-chip external feedback cavity, which serves as an optical mode-locking cavity. The external cavity, comprising a curved microlens composed of a photoresist and dielectric film reflector, is integrated into the emitting area of a standard VCSEL structure. The careful design of the external cavity ensures Gaussian-shaped optical field feedback into the active region of the VCSEL. Because a Gaussian-shaped optical field is preferred, the fundamental transverse mode oscillation within the VCSEL is enhanced. The thermal reflow of the photoresist is utilized to form the microlens, and the dielectric film is then deposited using low-temperature evaporation. The VCSEL achieves a stable single-mode operation post-thermal rollover with a side-mode suppression ratio (SMSR) of &gt;30 dB for operating temperatures between 0 and 80 °C. The system achieves a line width of 23.3 MHZ, and the maximum increase in the divergence angle is 1.4° at a current of 4 mA. Moreover, the maximum SMSR (38 dB) is achieved at 60 °C, and the peak output power of the single mode reaches 4.8 mW at 0 °C.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109091"},"PeriodicalIF":3.5,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultra-dense spatially multiple-dimensional OAM holography","authors":"Fajing Li ,&nbsp;Lemin Shan ,&nbsp;Huifeng Zhu ,&nbsp;Jiaqi Luo ,&nbsp;Shouping Nie ,&nbsp;Caojin Yuan","doi":"10.1016/j.optlaseng.2025.109092","DOIUrl":"10.1016/j.optlaseng.2025.109092","url":null,"abstract":"<div><div>Orbital angular momentum (OAM) holography has emerged as a promising technique for high-capacity and high-secure data encryption. However, traditional approaches face limitations in key space and encryption efficiency in response to information explosion. In this paper, we propose and implement an ultra-dense spatially multiple-dimensional multiplexed holographic technique by introducing a multi-parameter trigonometric-function phase (MTP)to modulate the spiral phase in OAM holography. The phase gradient of the spiral phase along the azimuthal angle is of nonlinear, variation by setting the type of trigonometric-function and its connected parameters besides the topological charge, namely the power order, the circular frequency factor and the phase rotation angle, which greatly strengthens the security. We show that the type of MTP can be used as the mode selectivity for OAM holography encryption. Furthermore, the minimum interval of the initial modulated phase angle, circular frequency and power order for multiplexed holography could reach <span><math><mrow><mn>0.33</mn><mi>π</mi></mrow></math></span>, 0.5 and 1, respectively. Meanwhile, it is demonstrated in simulations and experiments that three parameters in one of trigonometric-functions are individually used or randomly combined to generate new keys for data encryption. This exploration opens avenues for creating new information channels and bolstering information encryption security of multichannel holographic multiplexing.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109092"},"PeriodicalIF":3.5,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of KPCA-based infrared thermal wave radar imaging in the detection of internal defects in carbon steel materials","authors":"Lina Wang ,&nbsp;Chunming Lei ,&nbsp;Jinbo Li ,&nbsp;Surkova Ekaterina ,&nbsp;Binrui Wang ,&nbsp;Cunjun Li","doi":"10.1016/j.optlaseng.2025.109119","DOIUrl":"10.1016/j.optlaseng.2025.109119","url":null,"abstract":"<div><div>Detecting defects such as porosity, cracks and slag in oil pipeline welds Internal defects are essential to prevent potential safety risks. Infrared thermal wave radar has the advantages of high resolution, high efficiency and large detection depth, but its temperature response signal is often disturbed by environmental factors and non-uniform heating noise, which leads to the thermal response information of defects being covered by noise and affects the accuracy of detection. In order to solve this problem, this paper proposes a new method combining kernel principal component analysis and infrared thermal wave radar imaging technology (TWR). The KPCA algorithm is used to extract the nonlinear features in the thermal response data, and the dimension reduction processing and reconstruction are carried out. The time delay map with defect depth feature and the phase map with defect space feature are obtained by TWR analysis. The TWR, DAT and KPCA-TWR algorithms are used to analyze and process the temperature evolution data, and the signal-to-noise ratio (SNR) values of the reconstructed feature maps of different methods are compared. The results show that the SNR value of the KPCA-TWR method in the feature map reconstruction is about 130 % higher than that of the traditional TWR method, and about 80 % higher than that of the PCA-TWR method. The contrast between the defect area and the non-defect area is significantly enhanced, thus effectively improving the detection ability of the internal defects of carbon steel materials.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109119"},"PeriodicalIF":3.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bioinspired compound eyes with integrated waveguides for anti-optical crosstalk","authors":"Wenjun Wang ,&nbsp;Meng Zhou ,&nbsp;Aifei Pan ,&nbsp;Wen Yang ,&nbsp;Lei Hu ,&nbsp;Xuesong Mei ,&nbsp;Wenqiang Duan ,&nbsp;Xialun Yun","doi":"10.1016/j.optlaseng.2025.109099","DOIUrl":"10.1016/j.optlaseng.2025.109099","url":null,"abstract":"<div><div>Inspired by insect visual mechanisms, curved bionic compound eyes offer unique advantages in panoramic optoelectronic imaging. However, the limited degree of biomimicry in existing bionic compound eyes structures significantly hinders their practical applications, primarily due to optical crosstalk resulting from the absence of internal waveguides. In this paper, we report a curved bionic compound eyes with integrated inner waveguides capable of minimizing optical crosstalk through an innovative fabrication strategy. By employing curvature-matched focusing lenses and exploiting the photopolymer self-writing effect, the fabricated waveguides exhibit remarkable long-distance light transmission capabilities. The waveguides exceed 1.6 times the focal length of the microlens, along with excellent stray-light suppression. The reduction of 63.2 % in stray-light content and reduction of 81.98 % in point-source transmittance (PST) values were achieved. Optical performance tests confirm that the system is characterized by excellent focusing capabilities, a large field of view, and high sensitivity. This integrated architecture provides a crosstalk-minimized solution for micro-optical systems while advancing high-density optical MEMS and bioinspired vision technologies.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109099"},"PeriodicalIF":3.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-channel spatially modulated snapshot imaging polarimeter","authors":"Jing Zhang ,&nbsp;Yangchenshu Bai ,&nbsp;Yeqing Cao ,&nbsp;Yilin Zhang ,&nbsp;Qizhi Cao ,&nbsp;Yingkai Liu ,&nbsp;Chenling Jia ,&nbsp;Edward DeHoog","doi":"10.1016/j.optlaseng.2025.109101","DOIUrl":"10.1016/j.optlaseng.2025.109101","url":null,"abstract":"<div><div>The spatially modulated snapshot imaging polarimeter (SMSIP) encodes all the Stokes parameters (<span><math><mrow><msub><mi>S</mi><mn>0</mn></msub><mo>∼</mo><msub><mi>S</mi><mn>3</mn></msub></mrow></math></span>) of a target into a single interference image through spatial carrier frequencies, achieving the acquisition of the target image and all Stokes parameters in a single exposure. In the traditional single-channel SMSIP, there are issues with channel crosstalk and low spatial resolution of the frequency-domain inversion target image (<span><math><msub><mi>S</mi><mn>0</mn></msub></math></span>). In our previous research, we proposed a method involving two antiphase snapshot measurements, which can completely eliminate the crosstalk of <span><math><msub><mi>S</mi><mn>0</mn></msub></math></span> to other polarization channels and simultaneously obtain the full-resolution <span><math><msub><mi>S</mi><mn>0</mn></msub></math></span> component. However, this method requires two measurements, which increases the measurement time and system complexity, and is not conducive to the rapid acquisition of the target's complete polarization information. Therefore, this study introduces a novel steady-state dual-channel spatially modulated snapshot imaging polarimeter. The polarimeter utilizes the Modified Savart Polariscope as the core modulating device, with half-wave plates placed behind two Modified Savart Polariscopes for optical rotation. Subsequently, the Wollaston prism is employed for beam splitting, resulting in the simultaneous acquisition of two antiphase interference patterns on the detector CCD. By applying the inverse Fourier transform, it is possible to obtain full-resolution <span><math><msub><mi>S</mi><mn>0</mn></msub></math></span> and crosstalk-removed components (<span><math><mrow><msub><mi>S</mi><mn>1</mn></msub><mo>∼</mo><msub><mi>S</mi><mn>3</mn></msub></mrow></math></span>). This paper provides a detailed theoretical analysis of the proposed scheme and validates its feasibility through computer simulations and laboratory experiments.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109101"},"PeriodicalIF":3.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Swin transformer-based shape-from-focus technique for accurate 3D shape estimation","authors":"Ramazan Ozgur Dogan ,&nbsp;Hulya Dogan ,&nbsp;Alper Yilmaz","doi":"10.1016/j.optlaseng.2025.109108","DOIUrl":"10.1016/j.optlaseng.2025.109108","url":null,"abstract":"<div><div>Accurately estimating the three-dimensional (3D) shape of an object from two-dimensional (2D) images is a fundamental challenge in computer vision, with widespread applications in fields such as biomedical imaging and microscopy. Shape-from-Focus (SFF) is a widely adopted technique for addressing this challenge, relying on focus measures from image series captured at varying focal lengths. However, existing SFF techniques often face limitations such as inadequate performance in low-texture regions, sensitivity to noise, and high computational costs when processing high-resolution image series, hindering their effectiveness in real-world applications. To address these limitations, this study proposes a novel SFF technique based on the Swin Transformer, which introduces a hierarchical feature extraction framework and integrates a spatial frequency-based focus function directly into the deep feature space. This enables more robust focus-level detection and improved accuracy in 3D shape estimation for both real and simulated image series. The main contributions include multi-scale attention-based feature modeling and an enhanced sharpness evaluation strategy, yielding superior performance across various data sets. To validate the effectiveness of the proposed technique, extensive experiments are conducted using standard evaluation metrics, complemented by qualitative comparisons via reconstructed 3D shapes. The results consistently demonstrate that the Swin Transformer-based model outperforms existing SFF techniques in both quantitative and visual analyses. These findings highlight the robustness and innovation of the proposed SFF technique, establishing it as a reliable and efficient solution for 3D shape estimation.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109108"},"PeriodicalIF":3.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced integral imaging 3D display system: crosstalk elimination and depth enhancement using hole arrays and colloids","authors":"Ge Feng,&nbsp;Sun Mingxin,&nbsp;Ai Lingyu","doi":"10.1016/j.optlaseng.2025.109089","DOIUrl":"10.1016/j.optlaseng.2025.109089","url":null,"abstract":"<div><div>Integral imaging is a 3D display technology that provides realistic stereoscopic visual effects. However, traditional integral imaging display systems suffer from low resolution, severe crosstalk, and high granularity. To address these issues, we propose an integral imaging 3D display that pairs a hole array with a colloidal scattering layer to suppress crosstalk and extend depth of field. This system ensures the resolution of the 3D image while maintaining depth of field. A suitable hole array is analyzed and designed from the light field perspective to solve the crosstalk problem caused by light entering adjacent elemental lenses and lens gaps, affecting surrounding viewpoints. Simulations using LightTools verify the results. Theoretical analysis and experiments demonstrate that colloids smooth the system’s parallax, maintain the depth of the 3D image, and increase floatability. Experimental results show that the proposed method effectively improves the performance of the integral imaging display system.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109089"},"PeriodicalIF":3.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blind super-resolution reconstruction of infrared images based on dual-domain feature extraction","authors":"Huizhou Liu,&nbsp;Kui Yuan,&nbsp;Bowen Shen,&nbsp;Wei Xing,&nbsp;Mengxing Huang","doi":"10.1016/j.optlaseng.2025.109109","DOIUrl":"10.1016/j.optlaseng.2025.109109","url":null,"abstract":"<div><div>Existing infrared image super-resolution (SR) reconstruction methods typically employ a single degradation model to characterize image degradation, which often fails to reconstruct high-quality clear images in real-world scenarios effectively. Compared to visible light images, infrared or infrared thermal imaging images have lower resolution, fewer textures and details, and are more susceptible to noise interference. To address the challenges associated with the reconstruction of infrared images under complex degradation conditions, this paper proposes a novel wavelet transform-based blind super-resolution network (WTB-Net). WTB-Net can effectively realize multi-type degenerate kernel estimation, alternating optimization, and subsequent super-resolution image reconstruction under a unified framework. Firstly, to better extract the feature and detailed features of infrared images, we designed a bi-domain feature extraction module (BDFE), which is composed of multi-scale frequency domain feature extraction blocks (FDB) and spatial domain feature extraction blocks (SDB). In addition, we propose an edge attention mechanism to improve the reconstruction of edges and details. The above features will be input into the restorer and estimator for multiple super-resolution reconstructions, and the reconstruction results will be applied to the estimation and updating of a multi-class degraded fuzzy kernel. Finally, with the input of the low-resolution (LR) image, the high-resolution (HR) image can be generated based on the degraded fuzzy kernel and reconstruction network to complete the blind super-resolution reconstruction process. The proposed method is systematically compared with both classical and common super-resolution reconstruction methods using the Airai Electro-Optics Database and the LLVIP Database. The qualitative and quantitative results consistently validate the effectiveness of WTB-Net.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"193 ","pages":"Article 109109"},"PeriodicalIF":3.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}