Optics letters最新文献_第3页

Shaped vector beams generated with a phase-only modulation-retarder optical configuration. 用纯相位调制-延迟器光学结构产生的形状矢量光束。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.546144

Ignacio Moreno, Jeffrey A Davis, María Del Mar Sánchez-López, Don M Cottrell

引用次数: 0

Single-exposure x-ray dark-field imaging via a dual-energy propagation-based setup. 单曝光x射线暗场成像通过双能量传播为基础的设置。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.553310

Jannis N Ahlers, Konstantin M Pavlov, Marcus J Kitchen, Stephanie A Harker, Emily J Pryor, James A Pollock, Michelle K Croughan, Ying Ying How, Marie-Christine Zdora, Lucy F Costello, Dylan W O'Connell, Christopher Hall, Kaye S Morgan

{"title":"Single-exposure x-ray dark-field imaging via a dual-energy propagation-based setup.","authors":"Jannis N Ahlers, Konstantin M Pavlov, Marcus J Kitchen, Stephanie A Harker, Emily J Pryor, James A Pollock, Michelle K Croughan, Ying Ying How, Marie-Christine Zdora, Lucy F Costello, Dylan W O'Connell, Christopher Hall, Kaye S Morgan","doi":"10.1364/OL.553310","DOIUrl":"https://doi.org/10.1364/OL.553310","url":null,"abstract":"X-ray dark-field imaging visualizes scattering from sample microstructure and has found application in medical and security contexts. While most x-ray dark-field imaging techniques rely on masks, gratings, or crystals, recent work on the Fokker-Planck model of diffusive imaging has enabled dark-field imaging in the propagation-based geometry. Images captured at multiple propagation distances or x-ray energies can be used to reconstruct dark-field from propagation-based images but have previously required multiple exposures. Here, we show single-exposure dark-field imaging by exploiting the harmonic content in a monochromatized synchrotron beam and utilizing an energy-discriminating photon-counting detector to capture dual-energy propagation-based images. The method is validated by filming time-varying samples, showing the advantage of the dark-field contrast in analyzing dynamic evolution. We measure and adjust for the impact of detector charge-sharing on the images. This work opens the way for dynamic dark-field x-ray imaging without the need for a high-stability setup and precision optics.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2171-2174"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754052","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

Ultra-compact InGaAs/GaAs nano-ridge laser monolithically grown on 300 mm silicon substrate. 在300毫米硅衬底上生长的超紧凑InGaAs/GaAs纳米脊激光器。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.555718

Z Ouyang, E M B Fahmy, D Colucci, A A Yimam, J Van Campenhout, B Kunert, D Van Thourhout

{"title":"Ultra-compact InGaAs/GaAs nano-ridge laser monolithically grown on 300 mm silicon substrate.","authors":"Z Ouyang, E M B Fahmy, D Colucci, A A Yimam, J Van Campenhout, B Kunert, D Van Thourhout","doi":"10.1364/OL.555718","DOIUrl":"https://doi.org/10.1364/OL.555718","url":null,"abstract":"Compact and low-threshold III-V semiconductor lasers are considered to be promising light sources for the silicon photonics platform, as they could offer a small footprint and low energy consumption. However, the significant lattice mismatch between III-V materials and silicon poses a fundamental challenge for the monolithic integration of such lasers on a silicon substrate. Using aspect ratio trapping and nano-ridge engineering, it has been shown this challenge can be overcome. However, thus far, only devices with cavity lengths of several hundred micrometers have shown a laser operation. Here, we show what we believe to be a novel approach whereby an amorphous silicon grating is deposited on the sidewalls of the nano-ridge, allowing for much stronger feedback and much shorter cavity lengths. Based on this approach, we achieved lasing with a threshold density of 9.9 kW/cm2 under pulsed optical pumping, for a device with a cavity length as small as ∼16 µm. The side-mode suppression ratio and linewidth of the laser reach 24 dB and 1.25 nm under 25 kW/cm2. This laser not only demonstrates the high quality of the epitaxial material but also establishes a novel route to realize an ultra-compact electrically driven light source for future high-density and massively scalable silicon photonic integrated circuits.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2358-2361"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754061","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

Watt-level multi-gigahertz-repetition-rate femtosecond optical parametric oscillator. 瓦特级千兆赫重复率飞秒光学参量振荡器。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.555883

Hui Tong, Hua Wang, Wenlong Tian, Jinglan Huo, Jie Tao, Li Zheng, Yue Shi, Guoqiang Xie, Bin Zhang, Zhiyi Wei, Jiangfeng Zhu

引用次数: 0

Generation of subfemtosecond ultraviolet pulses by three-color near-infrared ionizing fields. 三色近红外电离场产生亚飞秒紫外脉冲。

IF 3.1 2区物理与天体物理

Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.545132

I D Laryushin, A A Romanov, N V Vvedenskii

引用次数: 0

High-power single-cycle THz emission from large-area photoconductive emitters at 400 kHz. 400 kHz时大面积光导发射器的大功率单周期太赫兹辐射。