Optics letters最新文献_第7页

Optical tunable terahertz metasurface based on the carbon nanotube film. 基于碳纳米管薄膜的光学可调谐太赫兹超表面。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.566166

Xiaoju Zhang, Yue Wang, Kexia Jiang, Xiang Zhang, Guangcheng Sun, Lihua Ma, Yumeng Ru

引用次数: 0

Quantitative phase imaging in Hadamard-based active single-pixel microscopy by the motionless transport of intensity equation. 基于hadamard的有源单像素显微镜中强度方程的静止输运定量相位成像。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.566044

Samuel I Zapata-Valencia, Heberley Tobon-Maya, Osamu Matoba, Jesús Lancis, Enrique Tajahuerce

引用次数: 0

Tunable hyperspectral filter based on rotated chirped volume Bragg gratings. 基于旋转啁啾体布拉格光栅的可调谐高光谱滤波器。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.562910

Shaghayegh Yaraghi, David Guacaneme, Swati Bhargava, Ameen Alhalemi, Oussama Mhibik, Daniel Cruz-Delgado, Rodrigo Amezcua-Correa, Ivan Divliansky, Miguel A Bandres

{"title":"Tunable hyperspectral filter based on rotated chirped volume Bragg gratings.","authors":"Shaghayegh Yaraghi, David Guacaneme, Swati Bhargava, Ameen Alhalemi, Oussama Mhibik, Daniel Cruz-Delgado, Rodrigo Amezcua-Correa, Ivan Divliansky, Miguel A Bandres","doi":"10.1364/OL.562910","DOIUrl":"https://doi.org/10.1364/OL.562910","url":null,"abstract":"Spectral filtering of the transverse profile of hyperspectral beams is essential in various areas of optics, from multimode photonics and hyperspectral imaging to optical communications. An optimal hyperspectral filter requires flexible tuning capabilities, both in central wavelength and spectral bandwidth. Currently available filters-such as thin-film, acousto-optic, and liquid crystal tunable filters (TFTFs, AOTFs, and LCTFs)-exhibit limitations such as restricted tuning ranges, compromised image quality, or relatively low damage thresholds. Here, we propose and demonstrate a novel, to our knowledge, tunable hyperspectral filter based on rotated chirped volume Bragg gratings. Our filter enables continuous and independent tuning of the central wavelength and full-width at half-maximum (FWHM) bandwidth, steep spectral edges, and high out-of-band rejection. Furthermore, it offers higher damage threshold compared to existing alternatives. Its compact, passive architecture eliminates the need for external power, making it a robust and efficient alternative to current tunable filtering technologies.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 13","pages":"4454-4457"},"PeriodicalIF":3.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144541764","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}

引用次数: 0

An interferometric fiber optic vibration sensor based on random phase modulation. 一种基于随机相位调制的干涉式光纤振动传感器。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.566576

Qi Li, Donghui Li, Yuanheng Zhao, Jianyong Zhang, Yan Liu, Guofang Fan, Fengping Yan, Desheng Chen, Muguang Wang

{"title":"An interferometric fiber optic vibration sensor based on random phase modulation.","authors":"Qi Li, Donghui Li, Yuanheng Zhao, Jianyong Zhang, Yan Liu, Guofang Fan, Fengping Yan, Desheng Chen, Muguang Wang","doi":"10.1364/OL.566576","DOIUrl":"https://doi.org/10.1364/OL.566576","url":null,"abstract":"A stable homodyne interferometric fiber optic vibration sensor is proposed and demonstrated by using a probe pulse, which is generated based on random phase modulation. The first half of the probe pulse is divided into three time slots. Each time slot is subjected to random and different phase modulation. The last half of the probe pulse is not modulated. An unequal-arm Michelson interferometer is used as the sensing unit of vibration sensor. By using a simple direct detection scheme, the interference signals of three time slots can be distinguished in the time domain. Two time slots' interference signals are selected and extracted as the signal to be demodulated. The vibration signal to be measured can be quantitatively measured by using ellipse fitting algorithm and arctangent algorithm. Compared with the traditional 3 × 3 coupler-based scheme, the system structure is simple and can form a large-scale sensor array. Moreover, the interference light signal in each time slot can provide multiple channels for averaging, resulting in a better demodulation signal-to-noise ratio (SNR) performance. By multi-channel averaging, the SNR is improved by at least 5.2 dB.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 13","pages":"4282-4285"},"PeriodicalIF":3.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144541682","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}

引用次数: 0

Coal classification and analysis based on shadowgraphy and deep learning methods. 基于阴影法和深度学习方法的煤炭分类与分析。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.559226

Tong Peng, Junrong Feng, Wen Yi, Feng Li, Ruibing Liu, Honglian Guo

{"title":"Coal classification and analysis based on shadowgraphy and deep learning methods.","authors":"Tong Peng, Junrong Feng, Wen Yi, Feng Li, Ruibing Liu, Honglian Guo","doi":"10.1364/OL.559226","DOIUrl":"https://doi.org/10.1364/OL.559226","url":null,"abstract":"The classification and analysis of coal are crucial for energy production and resource management. Shadowgraphy, leveraging variations in air refractive index and transmittance caused by shockwaves, presents a simple and accessible approach for the classification and component analysis of energetic materials. In this study, we developed an automated laser excitation and image acquisition system utilizing optical fibers of varying lengths. This method enables high-resolution imaging of the laser-induced shock wave propagation process within a range from hundreds of nanoseconds to several microseconds, without reducing imaging resolution as traditional high-speed cameras do when increasing frame rates. A convolutional neural network (CNN) was employed to analyze these shadowgrams, achieving a classification accuracy of 98.38% across 29 types of coal. Furthermore, we successfully predicted key content of coal such as ash content, volatile matter, and fixed carbon. The results showed that ash content yielded root mean square error of prediction (RMSEP) of 1.75%, while volatile matter and fixed carbon were RMSEP of 1.04% and 2.74%, respectively. In a laboratory setting, this powerful classification and content prediction method offers promising applications in material screening and identification.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 13","pages":"4294-4297"},"PeriodicalIF":3.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144541690","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}

引用次数: 0

Differential autocorrelation histogram of singular values for image reconstruction in reflection matrix optical coherence tomography. 反射矩阵光学相干层析成像中奇异值的微分自相关直方图重建。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.563000

Lu Yang, Yun Tang, Bingyan Zhang, Changyong Chen, Cui Ma, Zhiyi Liu, Zhihua Ding

{"title":"Differential autocorrelation histogram of singular values for image reconstruction in reflection matrix optical coherence tomography.","authors":"Lu Yang, Yun Tang, Bingyan Zhang, Changyong Chen, Cui Ma, Zhiyi Liu, Zhihua Ding","doi":"10.1364/OL.563000","DOIUrl":"https://doi.org/10.1364/OL.563000","url":null,"abstract":"Reflection matrix optical coherence tomography has recently emerged as a promising modality for ultra-deep optical imaging in a turbid tissue. However, a critical issue that is not well addressed is to determine the optimized number of primary singular values of the measured reflection matrix used for image reconstruction. In this paper, the method based on the differential autocorrelation histogram of singular values is proposed. The histogram distribution generally consists of two regions with distinct distribution characteristics. One is the continuously distributed region, which is related to the multiple-scattered noise and can be fitted by a skewed distribution curve. The other is the discrete distribution region associated with the single-scattered signal, which does not obey the fitting curve. The boundary between two regions is then identified and used to determine the optimized number of the primary singular values for image reconstruction. Both simulating and experimental results demonstrate that the proposed method is more robust and adaptable to samples with different signal-to-noises and large dynamic ranges of reflectivity, outperforming two currently adopted methods.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 13","pages":"4322-4325"},"PeriodicalIF":3.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144541698","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}

引用次数: 0

Enhanced photon trapping in perovskite solar cells via grating structures. 通过光栅结构增强钙钛矿太阳能电池中的光子捕获。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.564964

Chang Liu, Da Yin, Yi-Fan Wang, Su-Heng Li, Yue-Feng Liu, Jing Feng

引用次数: 0

Focus-tunable two-photon fiberscope enabling in vivo imaging at selected depths. 聚焦可调双光子光纤镜，可在选定深度进行体内成像。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.560869

Yuehan Liu, Jiayun L Huang, Xingde Li

引用次数: 0

Full-photonics up- and downconversions for W-band 16-QAM signal wireless delivery over 30.4 km with advanced equalizations. 全光子上下转换w波段16-QAM信号无线传输超过30.4公里与先进的均衡。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.559019

Dianyuan Ping, Qichao Lu, Junhao Zhao, Li Tao, Boyu Dong, Yinjun Liu, Shuhong He, Renjie Li, Jianyang Shi, Nan Chi, Junwen Zhang

{"title":"Full-photonics up- and downconversions for W-band 16-QAM signal wireless delivery over 30.4 km with advanced equalizations.","authors":"Dianyuan Ping, Qichao Lu, Junhao Zhao, Li Tao, Boyu Dong, Yinjun Liu, Shuhong He, Renjie Li, Jianyang Shi, Nan Chi, Junwen Zhang","doi":"10.1364/OL.559019","DOIUrl":"https://doi.org/10.1364/OL.559019","url":null,"abstract":"We have experimentally demonstrated a communication system with an ultra-long sea surface wireless distance of 30.4 km and high-speed 16-quadrature amplitude modulation (16-QAM) data transmission at the W-band based on full-photonics up- and downconversion technology. Utilizing a frequency- and phase-locked optical two-tone generator, the transceiver ensures a stable millimeter-wave (mmW) signal at 76.4 GHz for transmission. Furthermore, we proposed a Volterra nonlinear equalization (VNLE) algorithm to compensate for nonlinear damage in signal transmission. Thanks to full-photonics conversion technology and advanced post-equalization digital signal processing algorithms, we have achieved a data transmission rate of 16 Gb/s 16-quadrature amplitude modulation (16-QAM) signal over a sea surface distance of 30.4 km. It is worth noting that as a special type of channel, water vapor density and atmospheric conditions will greatly affect the signal transmission. To the best of our knowledge, this is the first demonstration of a full-photonics 16-QAM signal exceeding 30 km at the W-band on a single channel, achieving a rate-distance product of 16 Gb/s × 30.4 km = 486.4 Gbps·km.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 13","pages":"4314-4317"},"PeriodicalIF":3.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144541712","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}

引用次数: 0

High-resolution rapid-scanning Fourier transform spectroscopy of ultracold atoms. 超冷原子的高分辨率快速扫描傅立叶变换光谱。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-07-01 DOI: 10.1364/OL.565541

Friedemann Landmesser, Nicolai Gölz, Ulrich Bangert, Tobias Sixt, Lukas Bruder

引用次数: 0