Optics express最新文献_第7页

Real-time optical fibre near-infrared chromatic dispersion analyser using collocated optical fibre gratings. 使用同轴光纤光栅的实时光纤近红外色散分析仪。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.530983

Thomas Allsop, Andreas Ioannou, Kyriacos Kalli, Ranjeet S Bhamber, Evelyne Aguera, Alain Samson, Peggy Rigou, Cedric Saucier, Bernard Dussardier

{"title":"Real-time optical fibre near-infrared chromatic dispersion analyser using collocated optical fibre gratings.","authors":"Thomas Allsop, Andreas Ioannou, Kyriacos Kalli, Ranjeet S Bhamber, Evelyne Aguera, Alain Samson, Peggy Rigou, Cedric Saucier, Bernard Dussardier","doi":"10.1364/OE.530983","DOIUrl":"https://doi.org/10.1364/OE.530983","url":null,"abstract":"We present what we believe to be a novel optical fibre device for real-time measurements of near-infrared chromatic dispersion of a liquid medium from 1100 nm to 1700 nm. This inline optical fibre chromatic dispersion analyser is based upon collocated fibre long-period gratings written adjacently in the core by femtosecond laser inscription yielding 8 attenuation bands associated with different cladding modes, yielding 8 independent measurements. This fibre device is tested on a series of chemical compounds associated with wines. The results for each compound yielded distinctive chromatic responses. A machine learning pipeline was developed that successfully clustered and classified spectral responses of the different chemicals to illustrate the distinctive responses. The limits of detection for these fibre devices ranged from 1×10-3 to 6×10-5 mol/L for the compounds associated with wines, demonstrating the potential usefulness of an optical fibre chromatic dispersion analyser is capable of monitoring in real-time effective chromatic dispersion that is not offered by any current technology.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41026-41040"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688379","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

Characterizing post-compression of mJ-level ultrafast pulses via loose focusing in a gas cell. 通过气室中的松散聚焦，描述毫焦耳级超快脉冲的后压缩特性。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.539655

Fengling Zhang, Antonios Pelekanidis, Augustas Karpavicius, Matthias Gouder, Jacob Seifert, Kjeld Eikema, Stefan Witte

{"title":"Characterizing post-compression of mJ-level ultrafast pulses via loose focusing in a gas cell.","authors":"Fengling Zhang, Antonios Pelekanidis, Augustas Karpavicius, Matthias Gouder, Jacob Seifert, Kjeld Eikema, Stefan Witte","doi":"10.1364/OE.539655","DOIUrl":"https://doi.org/10.1364/OE.539655","url":null,"abstract":"The ability to generate high-intensity ultrashort laser pulses is a key driver for advancing the strong-field physics and its applications. Post-compression methods aim to increase the peak intensity of amplified laser pulses via spectral broadening through self-phase modulation (SPM), followed by temporal pulse compression. However, other unavoidable nonlinear self-action effects, which typically occur parallel to SPM, can lead to phase distortions and beam quality degradation. Here we study the ability to compress high-energy pulses by loose focusing in a noble gas to induce nonlinear spectral broadening, while limiting unwanted nonlinear effects such as self-focusing. We introduce ptychographic wavefront sensor and FROG measurements to identify the regimes that optimize pulse compression while maintaining high beam quality. Using a 700 mbar argon-filled double-pass-based scheme, we successfully compress 2 mJ, 170 fs, 1030 nm laser pulses to ∼35 fs, achieving 90% overall flux efficiency and excellent stability. This work provides guidelines for optimizing the compressed pulse quality and further energy scaling of double-pass-based post-compression concepts.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"40990-41003"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142687652","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

Pulse compressor architecture to enable next-generation high-energy petawatt-class lasers. 实现下一代高能量 petawatt 级激光器的脉冲压缩器结构。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.540763

David A Alessi, Jeff D Bude, Hoang T Nguyen, G Jackson Williams, Craig W Siders, Thomas M Spinka

引用次数: 0

Low-profile, wideband RCS-reduction antenna array based on a metal-ink hybrid metasurface. 基于金属墨水混合元表面的低剖面宽带 RCS 减小天线阵列。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.542662

Ao Fu, Chen Wang, Silong Chen, Kunping Yang, Bo Ren, Ping Chen

{"title":"Low-profile, wideband RCS-reduction antenna array based on a metal-ink hybrid metasurface.","authors":"Ao Fu, Chen Wang, Silong Chen, Kunping Yang, Bo Ren, Ping Chen","doi":"10.1364/OE.542662","DOIUrl":"https://doi.org/10.1364/OE.542662","url":null,"abstract":"In this study, a highly flexible metal-ink hybrid metasurface that can be integrated with planar structures is proposed. The metasurface achieves wideband absorption performance while maintaining an efficient transmission window. Based on equivalent circuit model analysis, an aperture-coupled antenna array was integrated with the metasurface, enabling simultaneous wideband radar cross-section (RCS) reduction and high-performance radiation. The integration of the metasurface and antenna array allowed the overall structure to maintain a low profile. Simulation results show that the proposed array achieves a 10 dB RCS reduction against a metal plate of the same size over the [2.03, 8.11] GHz range, with a fractional bandwidth of 119.9% under x-polarized wave incidence. Under y-polarized wave incidence, a 10 dB RCS reduction is achieved at both [2.12, 5.1] GHz and [6.1, 8.06] GHz, with fractional bandwidths of 82.5% and 27.6%, respectively. Moreover, the array maintains a peak gain of 26.3 dBi and sidelobe levels less than -18 dB. The experimental results align well with the simulated results. The proposed low-RCS antenna array offers potential advancements in planar antenna technology, enhancing stealth capabilities.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41619-41631"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688401","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

Optically transparent, broadband and omnidirectional microwave absorber based on graphene-SiO₂ metasurfaces. 基于石墨烯-二氧化硅超表面的光学透明、宽带和全向微波吸收器。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.538840

Hoyeong Kwon, Giuseppe D'Aguanno, Andrea Alù

引用次数: 0

Simple photonics-based angle of arrival and Doppler frequency shift measurement system for long baseline antennas. 用于长基线天线的基于光子学的简单到达角和多普勒频移测量系统。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.538403

Chongjia Huang, Mingtong Liu, Hao Chen, HengHao Chen, Erwin H W Chan

{"title":"Simple photonics-based angle of arrival and Doppler frequency shift measurement system for long baseline antennas.","authors":"Chongjia Huang, Mingtong Liu, Hao Chen, HengHao Chen, Erwin H W Chan","doi":"10.1364/OE.538403","DOIUrl":"https://doi.org/10.1364/OE.538403","url":null,"abstract":"Using photonics to measure the characteristics of an RF signal has a number of advantages compared to electronics. As a result, many photonics-based RF signal measurement systems have been reported. However, none of them can simultaneously measure an RF signal angle-of-arrival (AOA) and Doppler frequency shift (DFS) while having a simple and low-cost structure that is suitable for use in a long baseline antenna array. This paper presents a microwave photonic system to fill this technology gap. Additionally, the system is designed to have a robust performance, which is needed for practical applications. Measured results demonstrate simultaneous AOA and DFS measurement using the phase difference and the frequency of two low-frequency components generated by the system. The AOA and DFS measurement accuracy are within ±1° over the 0° to 81.5° AOA measurement range and within ±0.05 Hz over the ±50 kHz DFS measurement range. Results also show the system exhibits a stable performance with less than ±0.4° and ±0.02 Hz change in the measured AOA and DFS respectively, over an hour measurement period.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41936-41947"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688390","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

Real-time target recognition with all-optical neural networks for ghost imaging. 利用全光神经网络实时识别目标，实现鬼影成像。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.539339

Yuanyuan Xi, Yuchen He, Yadi Wang, Hui Chen, Huaibin Zheng, Jianbin Liu, Yu Zhou, Zhuo Xu

{"title":"Real-time target recognition with all-optical neural networks for ghost imaging.","authors":"Yuanyuan Xi, Yuchen He, Yadi Wang, Hui Chen, Huaibin Zheng, Jianbin Liu, Yu Zhou, Zhuo Xu","doi":"10.1364/OE.539339","DOIUrl":"https://doi.org/10.1364/OE.539339","url":null,"abstract":"The generation and structural characteristics of random speckle patterns impact the implementation and imaging quality of computational ghost imaging. Their modulation is limited by traditional electronic hardware. We aim to address this limitation using the features of an all-optical neural network. This work proposes a real-time target recognition system based on an all-optical diffraction deep neural network for ghost imaging. We use a trained neural network to perform pure phase modulation on visible light, and directly complete the target recognition task by detecting the maximum value of light intensity signals at different positions. We optimized the system by simulating the effects of parameters, such as the number of layers of the network, photosensitive pixel, unit area etc., on the final recognition performance, and the accuracy of target recognition reached 91.73%. The trained neural network is materialised by 3D printing technology and experiments confirmed that the system successfully performs real-time target recognition at a low sampling rate of 1.25%. It also verified the feasibility and noise resistance of the system in practical application scenarios.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"40967-40978"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688402","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

Silicon double-disk optomechanical resonators from wafer-scale double-layered silicon-on-insulator. 晶圆级双层硅绝缘体硅双盘光机械谐振器。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.538819

Amy Navarathna, Benjamin J Carey, James S Bennett, Soroush Khademi, Warwick P Bowen

引用次数: 0

Absorption line broadening in atomic beams produced in a molecular beam epitaxy environment. 在分子束外延环境中产生的原子束中的吸收线增宽。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.536538

Roman Rousseau, Jérôme Morville, Claude Botella, Guillaume Saint-Girons

引用次数: 0

Quantum efficiency enhancement of reflective GaAs photocathodes with exponential-doping structure generating a favorable built-in electric field. 具有指数掺杂结构的反射型砷化镓光电阴极的量子效率提升，可产生有利的内置电场。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.537424

Yu Jiang, Yijun Zhang, Zehao Tong, Song Tang, Tao Guo, Yunsheng Qian, Jianning Sun, Lin Ren, Muchun Jin, Feng Shi, Hongchang Cheng, Yugang Zeng

{"title":"Quantum efficiency enhancement of reflective GaAs photocathodes with exponential-doping structure generating a favorable built-in electric field.","authors":"Yu Jiang, Yijun Zhang, Zehao Tong, Song Tang, Tao Guo, Yunsheng Qian, Jianning Sun, Lin Ren, Muchun Jin, Feng Shi, Hongchang Cheng, Yugang Zeng","doi":"10.1364/OE.537424","DOIUrl":"https://doi.org/10.1364/OE.537424","url":null,"abstract":"The rapid development of GaAs photocathodes has led to an increased focus on the attainment of high quantum efficiency. Three types of exponential-doping structures with a high to low doping concentration distribution from the interior to the surface are proposed for reflective GaAs emission layers. These three structures generate different built-in electric fields that facilitate photoelectron emission. The one-dimensional continuity equations for the increasing, constant, and decreasing types of built-in electric fields are derived, respectively. The electron concentration distribution and quantum efficiency varying with the wavelength are solved numerically by the finite difference method. The simulation results indicate that the quantum efficiency of the GaAs photocathode with the increasing type of built-in electric field is superior to that with the constant built-in electric field, while the GaAs photocathode with the decreasing type of built-in electric field shows the worst performance. Then, the designed GaAs photocathodes with the increasing and constant types of built-in electric fields are grown by metal-organic chemical vapor deposition and activated by cesium-oxygen alternating deposition. The measured spectral response curves show that the quantum efficiency of the GaAs photocathode with the increasing type of built-in electric field is higher in the whole band than that with the constant type of built-in electric field. In addition, the exponential-doping structure generating the increasing type of built-in electric field is beneficial for improving the surface potential barrier and increasing the surface electron escape probability.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41925-41935"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688368","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