Optics Communications最新文献

{"title":"DNASM -TID: Atmospheric scattering model construction based on light source distance and image dehazing for nighttime traffic scenes","authors":"Xingang Wang ,&nbsp;Junwei Tian ,&nbsp;Yalin Yu ,&nbsp;Qin Wang ,&nbsp;Yupeng Feng ,&nbsp;Haokai Gao ,&nbsp;Irene Korkor Nyengor Agbenu ,&nbsp;Shifan Yu","doi":"10.1016/j.optcom.2025.132093","DOIUrl":"10.1016/j.optcom.2025.132093","url":null,"abstract":"<div><div>Nighttime traffic scene image dehazing has an important application value for nighttime traffic driving and security monitoring activities. Aiming at the existing nighttime image dehazing optical model for the non-uniform distribution of artificial light sources is not enough to consider the problems of halo and uneven illumination in the dehazed image. A nighttime image imaging atmospheric scattering model based on the distance of the light source is constructed. An image dehazing algorithm for nighttime traffic scenes is proposed based on the constructed optical model. Firstly, the near light source region in the foggy image at nighttime is segmented based on Gaussian pyramid, and in order to deal with the scattering effect of artificial light source more accurately, a discriminative index for the proximity of scene pixels to the center of the light source is proposed. Then, the atmospheric light matrix conforming to the regional distribution of light sources is estimated using Gaussian low-pass filtering, and to obtain a more accurate atmospheric light matrix, a channel map is constructed as a guided map by utilizing the luminance and saturation components of the image, and fast guided filtering is carried out on the preliminarily obtained atmospheric light matrix. Subsequently, the transmittance matrices of the near-source and far-source regions are solved using the bright and dark channel a priori, respectively. The optimal fusion model with <em>L</em>₂ norm regularization is established to solve the fused transmittance matrix. To avoid the block partition effect in the process of transmittance fusion, anisotropic Gaussian filtering is carried out on the fused transmittance matrix. Finally, a dark-adaptive adjustment function is designed to adaptively adjust the image's brightness level after dehazing. The experimental results show that the proposed nighttime traffic scene image dehazing algorithm dehazes the image after the subjective visual effect of dehazing more thoroughly, at the same time, effectively mitigates the problem of uneven halo and luminance distribution. Compared with other nighttime image dehazing algorithms, it shows substantial superiority in subjective and objective evaluation experiments.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132093"},"PeriodicalIF":2.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Propagation of modified anomalous vortex beams in a gradient-index medium","authors":"Bikash K. Das ,&nbsp;Camilo Granados ,&nbsp;Marcelo F. Ciappina","doi":"10.1016/j.optcom.2025.132030","DOIUrl":"10.1016/j.optcom.2025.132030","url":null,"abstract":"<div><div>Modified anomalous vortex (MAV) beams are orbital angular momentum (OAM)-carrying light beams with controlled self-focusing properties. We investigate the propagation of MAV beams in a gradient-index (GRIN) medium. Based on the Huygens-Fresnel integral and ABCD matrix, we derive an analytical expression for the complex amplitude of the MAV beam propagating in a GRIN medium. The effects of the topological charge (TC), the order of the vortex beam, the modification parameter, the gradient-index parameter, and the refractive index of the medium axis on the intensity distributions of the MAV beam are numerically studied. The propagation trajectory and intensity distributions are shown to change periodically in the GRIN medium with increasing propagation distances. The gradient index parameter also determines the periodic values of the MAV beams during propagation, and the period of evolution decreases as the value of the gradient index parameter increases. Moreover, the refractive index at the symmetry axis has little effect on the focusing intensity of the MAV beam and does not influence the maximum radius of the bright ring as the beam propagates through the GRIN medium. The results presented in this paper may be useful for applications of MAV beams in optical guiding, optical communication, and laser optics.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132030"},"PeriodicalIF":2.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simultaneous detection of refractive index and sound velocity in liquid solvents using topological interface states in phoxonic crystal waveguides","authors":"Yuankun Ji,&nbsp;Yiming Song,&nbsp;Tianren Lin,&nbsp;Tian-Xue Ma","doi":"10.1016/j.optcom.2025.132026","DOIUrl":"10.1016/j.optcom.2025.132026","url":null,"abstract":"<div><div>Topologically protected boundary states in artificially photonic and phononic materials offer a promising platform for the design of robust wave devices due to their inherent immunity to structural perturbations. In this study, we propose phoxonic crystal (PxC) waveguides for simultaneous guidance of electromagnetic and acoustic waves, and numerically investigate their wave characteristics using finite element analysis. It is demonstrated that both the topologically trivial and non-trivial phases could be realized by varying the PxC waveguides’ geometric parameters, enabling the creation of PxC structures supporting the zero-dimensional topological interface states (TISs) for both electromagnetic and acoustic waves. The developed TISs are subsequently applied for the detection of refractive index and sound velocity of water/1-propanol mixtures with different concentrations. Notably, the sensing performance of the topological PxC waveguides maintain remarkable stability against intentionally introduced structural perturbations.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132026"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal control of redshift of high-order harmonic in two-color laser fields","authors":"Guang-Rui Jia,&nbsp;Hui-Xia Kang,&nbsp;Ze-Hui Liu","doi":"10.1016/j.optcom.2025.132069","DOIUrl":"10.1016/j.optcom.2025.132069","url":null,"abstract":"<div><div>High-order harmonic generation (HHG) from the polar diatomic molecule HeH²⁺ is investigated by time-dependent Schrödinger equation (TDSE) in the few-cycle two-color laser (TCL) fields. The impact of the phase difference and inhomogeneity of the TCL fields on HHG was elucidated in this paper. The phase difference affects the rising and falling part and the asymmetry of the TCL field to modulate the occurrence of non-adiabatic redshift. The redshift variations with a period of π as the phase difference changes and the redshift amplitude is the largest when the phase difference is 0.5π. The phase difference also affects the recombination of electrons with adjacent ions, the maximum kinetic energies change increases with the increase of phase difference that can make the high-order harmonic spectrum broaden. The inhomogeneity modifies the laser field distribution, inducing observable modulations in the redshift magnitude of high-order harmonics. Crucially, with a fixed phase difference, controlled enhancement of the inhomogeneity within an optimal range significantly amplifies the redshift. We can optimize of redshift tuning in HHG by these adjustments above.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132069"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrafast-pumped temperature response in in-line cascaded quasi-phase-matching optical second harmonic","authors":"Yuhang He ,&nbsp;Dan Yu ,&nbsp;Yan Li ,&nbsp;Hongpeng Liu ,&nbsp;Weiji He ,&nbsp;Qian Chen","doi":"10.1016/j.optcom.2025.132088","DOIUrl":"10.1016/j.optcom.2025.132088","url":null,"abstract":"<div><div>We have proposed and experimentally demonstrated a bus temperature sensor array based on nonlinear optics second harmonic generation (SHG) in periodically poled lithium niobate (PPLN) and wavelength coded with poling period. The temperature response on bulk PPLN is studied by interrogating SHG spectra. Group dispersion factor and efficient thermal-birefringence between fundamental wave and second harmonic wave are proposed to describe peak wavelength shift. Single temperature sensor capitalizing on mode-locked laser provides 0.11 nm/°C sensitivity, 80 °C dynamic range around room temperature, and 2 °C temperature resolution. Additionally, a wavelength-coded 1 × 4 sensor array is demonstrated via quasi-comb spectra induced by poling period engineering. Each sensing unit has a unique poling period and SHG peak wavelength which can shift independently, and the temporal-evolved joint spectra of two non-cooperative targets confirm the practicability. The arrayed temperature sensors validate great applying potential on photonic integrated circuits (PIC).</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132088"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploration of AI security: Application of a novel chaotic map 2D- SCD in the two-dimensional spatial mirror projection algorithm","authors":"Zhenlong Man ,&nbsp;Yu Dai ,&nbsp;Tengyuan Liu ,&nbsp;Xiangfu Meng","doi":"10.1016/j.optcom.2025.132023","DOIUrl":"10.1016/j.optcom.2025.132023","url":null,"abstract":"<div><div>Artificial intelligence technology has broad prospects, and there are numerous researches related to computer vision. Ensuring the security of training image data for artificial intelligence models has become a research hotspot. In view of the characteristics of continuity and large amount of data of training images, this paper designs a new lightweight Two-dimensional Chaotic Map(2D-SCD) as a key generator. While ensuring the randomness of the key, it reduces the complexity of the chaotic system. The superiority of this chaotic map is proved through a series of performance analyses. In addition, this paper also proposes a random mirror mapping image security research scheme. Firstly, combined with the proposed Quadrature Amplitude Modulation(QAM), pixels of different blocks are migrated between blocks with different random waveforms to break the correlation between adjacent pixels. Afterwards, a chaotic system is used to generate a random mirror. By decomposing the key and pixel value in a 2D space, the key constitutes a spatial mirror, and the pixel value generates a diffusion value through the projection of this spatial mirror, thereby achieving the hiding of plaintext information. Simulation outcomes demonstrate that the suggested encryption method can successfully safeguard image security in the context of artificial intelligence.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132023"},"PeriodicalIF":2.2,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectral efficiency optimization for optical IRS assisted multi-user MISO beamforming-based indoor visible light communication systems","authors":"Qi Liu,&nbsp;Fengyuan Shi,&nbsp;Ping Wang,&nbsp;Ting Yang,&nbsp;Yanzhe Sun,&nbsp;Hanlin Su","doi":"10.1016/j.optcom.2025.132005","DOIUrl":"10.1016/j.optcom.2025.132005","url":null,"abstract":"<div><div>In this work, a novel spectral efficiency (SE) optimization scheme has been proposed to improve the performance of the optical intelligent reflective surface (OIRS) assisted multi-user multi-input single-output (MISO) beamforming-based indoor visible light communication (VLC) system. Specifically, by jointly optimizing the transmit beamforming (BF) and OIRS assignment, an overall SE maximization problem has been formulated, which is subject to the communication quality of service (QoS) requirement for each user, OIRS configuration constraints, and the direct current (DC) bias constraints of the light-emitting diodes (LEDs). In order to tackle this formulated non-convex problem, the original problem is decomposed into the transmit BF and OIRS assignment sub-problems, which are transformed by variable transformations and first-order Taylor expansions, and then the successive convex approximation (SCA)-based semidefinite relaxation (SDR) algorithm and the SCA-based relaxed greedy algorithm are proposed to solve these two transformed sub-problems, respectively. Subsequently, the alternating optimization (AO) algorithm is adopted to solve the sub-problems alternatively until convergence. Simulation results demonstrate that for 48 OIRS units, the proposed scheme could improve the overall SE by approximately 4.24 bps/Hz, 4.19 bps/Hz, 3.74 bps/Hz and 2.70 bps/Hz, respectively, compared to that of the location-assisted interior-point (LIP) algorithm-based OIRS assignment scheme, the distance-greedy OIRS assignment scheme, the random OIRS assignment scheme and the scheme without OIRS under the noise power of <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>10</mn></mrow></msup></mrow></math></span> W. This work will benefit the research and development of indoor VLC systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132005"},"PeriodicalIF":2.2,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated design of temperature and distance focusing for MWIR optical imaging system","authors":"Han Bing ,&nbsp;Ma Hongtao ,&nbsp;Fu Yuegang ,&nbsp;Xu Honggang ,&nbsp;Li Xu ,&nbsp;Zhang Mingliang","doi":"10.1016/j.optcom.2025.132074","DOIUrl":"10.1016/j.optcom.2025.132074","url":null,"abstract":"<div><div>To address the urgent demand for mid-wave infrared (MWIR) optical imaging systems in the military field, a MWIR optical imaging system has been designed based on a domestic large-format mid-wave cooling infrared detector with a resolution of 640 × 512 pixels and a pixel size of 15 μm. The system operates within a wavelength range of 3.7 μm–4.8 μm and features an F-number of 2 and a focal length of 900 mm. The system adopts a secondary imaging structure to obtain 100 % cold shield efficiency, effectively eliminating aberrations and comprehensively considers temperature focusing and distance focusing, realizing the integrated design of temperature and distance focusing in the MWIR optical imaging system. The results indicate that when the field of view (FOV) ω ≤ 0.7ω_max, modulation transfer function (MTF) ≥ 0.6@17lp/mm, and when ω &gt; 0.7ω_max, MTF≥ 0.55@17lp/mm. Within an environmental temperature range of 0 °C–40 °C, the image quality remains stable by fine-tuning the distance between the 3/4 mirror and the secondary mirror. Similarly, when the target distance varies from infinity to 10 km, the system can also maintain clear imaging by adjusting the distance of 3/4 mirror relative to the secondary mirror. The system has the advantages of compact structure, long focal length, high resolution, and high imaging quality, which can meet the requirements of the new generation airborne MWIR optical imaging system.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132074"},"PeriodicalIF":2.2,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-wavelength operation in a dual-cavity Nd:YVO4 laser","authors":"E.K. Park ,&nbsp;I.C. Park ,&nbsp;J.W. Kim","doi":"10.1016/j.optcom.2025.132073","DOIUrl":"10.1016/j.optcom.2025.132073","url":null,"abstract":"<div><div>A simple method for achieving dual-wavelength operation in a dual-cavity laser configuration incorporating an etalon and a quarter-wave plate is reported. By adjusting the tilt angle of the etalon and the rotation angle of the quarter-wave plate in a dual-cavity laser, we could select the excited laser wavelength with σ-polarization while independently controlling the cavity loss of the resonating beam with π-polarization, enabling us robust dual-wavelength laser operation. This approach has been applied to a Nd:YVO₄ laser, yielding robust dual-wavelength laser operation with an adjustable power ratio at 1064 nm and 1067 nm (or 1063 nm). The output characteristics and the prospects for further improvement are also discussed.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132073"},"PeriodicalIF":2.2,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144231755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical sharing dual-comb fiber laser with 200 MHz repetition-rate","authors":"Yiqiu Liang ,&nbsp;Yao Li ,&nbsp;Haonan Gong ,&nbsp;Rui Guo ,&nbsp;Handong Yao ,&nbsp;Zehui Cui ,&nbsp;Xiaorong Gu ,&nbsp;Youwen Liu","doi":"10.1016/j.optcom.2025.132078","DOIUrl":"10.1016/j.optcom.2025.132078","url":null,"abstract":"<div><div>We have introduced a mechanical sharing mode-locked dual-comb fiber laser with a linear and short laser cavity. Dual-comb ultrashort pulses with high repetition rate of 225 MHz, and repetition rate difference of 13.2 kHz have been obtained. Due to the special mechanical sharing design, the dual-comb laser source has exhibited relative stability and mutual coherence. The standard deviation of repetition rate difference is only 0.6 Hz over 30 min. Besides, the relative intensity noises of the two combs indicate that they have a high similarity of common-mode noise. It is also found that the dual-comb interferogram and its RF spectrum can remain stable for a long time without spectrum aliasing. Finally, a proof-of-principle dual-comb spectroscopy experiment with mode-resolved capability has been demonstrated. The experimental results indicate this mechanical sharing dual-comb fiber laser with good mode-locking performance and compact size has the potential to be used in various dual-comb measurements.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"591 ","pages":"Article 132078"},"PeriodicalIF":2.2,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}