APL Photonics最新文献_第8页

Thermalization dynamics in photonic lattices of different geometries 不同几何形状光子晶格中的热化动力学

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-06-24 DOI: 10.1063/5.0205202

Guowen Yang, Domenico Bongiovanni, Daohong Song, Roberto Morandotti, Zhigang Chen, Nikolaos K. Efremidis

{"title":"Thermalization dynamics in photonic lattices of different geometries","authors":"Guowen Yang, Domenico Bongiovanni, Daohong Song, Roberto Morandotti, Zhigang Chen, Nikolaos K. Efremidis","doi":"10.1063/5.0205202","DOIUrl":"https://doi.org/10.1063/5.0205202","url":null,"abstract":"The statistical mechanical behavior of weakly nonlinear multimoded optical settings has been attracting increased interest over the last few years. The main purpose of this work is to numerically investigate the main factors that affect the thermalization process in photonic lattices. In particular, we find that lattices with identically selected properties (such as temperature, coupling coefficient, lattice size, and excitation conditions) can exhibit very different thermalization dynamics and, thus, thermalization distances. Our investigation is focused on two different two-dimensional lattices: the honeycomb lattice and the triangular lattice. Our numerical results show that, independently of the excitation conditions, the honeycomb lattice always thermalizes faster than the triangular lattice. We mainly explain this behavior by the quasilinear spectrum that promotes wave-mixing in the honeycomb lattice in comparison to the power-like spectrum of the triangular lattice. In addition, we investigate the combined effects of temperature as well as the sign and magnitude of the nonlinearity. Switching either the sign of the Kerr nonlinear coefficient or the sign of the temperature can lead to significant differences in the thermalization dynamics, a phenomenon that can be physically explained in terms of wave instabilities. Larger absolute values of the temperature |T| result in more uniform distributions for the power occupation numbers and faster thermalization speeds. Finally, as expected, increasing the magnitude of the nonlinearity results in accelerated thermalization. Our findings provide valuable insights into optical thermalization in discrete systems, where experimental realization may bring about new possibilities for light manipulation and applications.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"36 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Theory of transverse mode instability in fiber amplifiers with multimode excitations 具有多模激励的光纤放大器中的横模不稳定性理论

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-06-21 DOI: 10.1063/5.0206859

Kabish Wisal, Chun-Wei Chen, Hui Cao, A. Douglas Stone

{"title":"Theory of transverse mode instability in fiber amplifiers with multimode excitations","authors":"Kabish Wisal, Chun-Wei Chen, Hui Cao, A. Douglas Stone","doi":"10.1063/5.0206859","DOIUrl":"https://doi.org/10.1063/5.0206859","url":null,"abstract":"Transverse Mode Instability (TMI) that results from dynamic nonlinear thermo-optical scattering is the primary limitation to power scaling in high-power fiber lasers and amplifiers. It has been proposed that TMI can be suppressed by exciting multiple modes in a highly multimode fiber. We derive a semi-analytic frequency-domain theory of the threshold for the onset of TMI in narrowband fiber amplifiers under arbitrary multimode input excitation for general fiber geometries. Our detailed model includes the effect of gain saturation, pump depletion, and mode-dependent gain. We show that TMI results from the exponential growth of noise in all the modes at downshifted frequencies due to the thermo-optical coupling. The noise growth rate in each mode is given by the sum of signal powers in various modes weighted by pairwise thermo-optical coupling coefficients. We calculate thermo-optical coupling coefficients for all ∼104 pairs of modes in a standard circular multimode fiber and show that modes with large transverse spatial frequency mismatch are weakly coupled, resulting in a banded coupling matrix. This short-range behavior is due to the diffusive nature of the heat propagation, which mediates the coupling and leads to a lower noise growth rate upon multimode excitation compared to a single mode, resulting in significant TMI suppression. We find that the TMI threshold scales linearly with the number of modes that are excited asymptotically, leading to roughly an order of magnitude increase in the TMI threshold in an 82-mode fiber amplifier.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"29 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A silicon photonics waveguide-coupled colloidal quantum dot photodiode sensitive beyond 1.6 µm 灵敏度超过 1.6 µm 的硅光子波导耦合胶体量子点光电二极管

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-06-20 DOI: 10.1063/5.0206386

Chao Pang, Yu-hao Deng, Ezat Kheradmand, Luis Moreno Hagelsieb, Yujie Guo, David Cheyns, Pieter Geiregat, Zeger Hens, Dries Van Thourhout

{"title":"A silicon photonics waveguide-coupled colloidal quantum dot photodiode sensitive beyond 1.6 µm","authors":"Chao Pang, Yu-hao Deng, Ezat Kheradmand, Luis Moreno Hagelsieb, Yujie Guo, David Cheyns, Pieter Geiregat, Zeger Hens, Dries Van Thourhout","doi":"10.1063/5.0206386","DOIUrl":"https://doi.org/10.1063/5.0206386","url":null,"abstract":"Silicon photonics faces a persistent challenge in extending photodetection capabilities beyond the 1.6 µm wavelength range, primarily due to the lack of appropriate epitaxial materials. Colloidal quantum dots present a promising solution here, offering distinct advantages, such as infrared wavelength tunability, cost-effectiveness, and facile deposition. Their unique properties position them as a potential candidate for enabling photodetection in silicon photonics beyond the conventional telecom wavelength, thereby expanding the potential applications and capabilities within this domain. In this study, we have successfully integrated lead sulfide (PbS) colloidal quantum dot photodiodes (QDPDs) onto silicon waveguides using standard process techniques. The integrated photodiodes exhibit a remarkable responsivity of 1.3 A/W (with an external quantum efficiency of 74.8%) at a wavelength of 2.1 µm, a low dark current of only 106 nA, and a bandwidth of 1.1 MHz under a −3 V bias. To demonstrate the scalability of our integration approach, we have developed a compact 8-channel spectrometer incorporating an array of QDPDs. This achievement marks a significant step toward realizing a cost-effective photodetector solution for silicon photonics, particularly tailored for a wide range of sensing applications around the 2 µm wavelength range.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"2012 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Unsupervised learning enables multicolor synchronous fluorescence microscopy without cytoarchitecture crosstalk 无监督学习可实现多色同步荧光显微镜观察，且无细胞结构串扰

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-05-30 DOI: 10.1063/5.0202622

Bolin Lu, Zhangheng Ding, Kefu Ning, Xiaoyu Zhang, Xiangning Li, Jiangjiang Zhao, Ruiheng Xie, Dan Shen, Jiahong Hu, Tao Jiang, Jianwei Chen, Hui Gong, Jing Yuan

{"title":"Unsupervised learning enables multicolor synchronous fluorescence microscopy without cytoarchitecture crosstalk","authors":"Bolin Lu, Zhangheng Ding, Kefu Ning, Xiaoyu Zhang, Xiangning Li, Jiangjiang Zhao, Ruiheng Xie, Dan Shen, Jiahong Hu, Tao Jiang, Jianwei Chen, Hui Gong, Jing Yuan","doi":"10.1063/5.0202622","DOIUrl":"https://doi.org/10.1063/5.0202622","url":null,"abstract":"In multicolor fluorescence microscopy, it is crucial to orient biological structures at a single-cell resolution based on precise anatomical annotations of cytoarchitecture images. However, during synchronous multicolor imaging, due to spectral mixing, the crosstalk from the blue signals of 4′,6-diamidino-2-phenylindole (DAPI)-stained cytoarchitecture images to the green waveband hinders the visualization and identification of green signals. Here, we proposed a deep learning-based framework named the crosstalk elimination and cytoarchitecture enhancement pipeline (CECEP) to simultaneously acquire crosstalk-free signals in the green channel and high-contrast DAPI-stained cytoarchitecture images during multicolor fluorescence imaging. For the CECEP network, we proposed an unsupervised learning algorithm named the cytoarchitecture enhancement network (CENet), which increased the signal-to-background ratio (SBR) of the cytoarchitecture images from 1.5 to 15.0 at a reconstruction speed of 25 Hz for 1800 × 1800 pixel images. The CECEP network is widely applicable to images of different quality, different types of tissues, and different multicolor fluorescence microscopy. In addition, the CECEP network can also facilitate various downstream analysis tasks, such as cell recognition, structure tensor calculation, and brain region segmentation. With the CECEP network, we simultaneously acquired two specific fluorescence-labeled neuronal distributions and their colocated high-SBR cytoarchitecture images without crosstalk throughout the brain. Experimental results demonstrate that our method could potentially facilitate multicolor fluorescence imaging applications in biology, such as revealing and visualizing different types of biological structures with precise locations and orientations.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"28 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

778.1 nm distributed feedback lasers for Rb two-photon atomic systems with sub-4 kHz linewidths 用于掺镱双光子原子系统的 778.1 nm 分布式反馈激光器，线宽低于 4 kHz

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-05-30 DOI: 10.1063/5.0191088

E. Di Gaetano, B. Keliehor, K. Gallacher, P. F. Griffin, M. Sorel, E. Riis, D. J. Paul

引用次数: 0

Solar lasers: Why not? 太阳能激光器：为什么不呢？

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-05-28 DOI: 10.1063/5.0209355

Michael Küblböck, Jonathan Will, Hanieh Fattahi

引用次数: 0

Second harmonic of higher-order Poincaré sphere beam with two orthogonal 5%MgO:PPLN crystals 带有两个正交 5%MgO:PPLN 晶体的高阶波恩卡莱球形光束的二次谐波

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-05-28 DOI: 10.1063/5.0198012

Qinan Jiang, Minglin Zhao, Yuanxiang Wang, Shuolin Wang, Jiantai Dou, Jun Liu, Bo Li, Youyou Hu

引用次数: 0

Mid-infrared optical coherence tomography with MHz axial line rate for real-time non-destructive testing 用于实时无损检测的兆赫轴向线速率中红外光相干断层成像技术

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-05-17 DOI: 10.1063/5.0202019

Satoko Yagi, Takuma Nakamura, Kazuki Hashimoto, Shotaro Kawano, Takuro Ideguchi

{"title":"Mid-infrared optical coherence tomography with MHz axial line rate for real-time non-destructive testing","authors":"Satoko Yagi, Takuma Nakamura, Kazuki Hashimoto, Shotaro Kawano, Takuro Ideguchi","doi":"10.1063/5.0202019","DOIUrl":"https://doi.org/10.1063/5.0202019","url":null,"abstract":"Non-destructive testing (NDT) is crucial for ensuring product quality and safety across various industries. Conventional methods, such as ultrasonic, terahertz, and x-ray imaging, have limitations in terms of probe-contact requirement, depth resolution, or radiation risks. Optical coherence tomography (OCT) is a promising alternative to solve these limitations, but it suffers from strong scattering, limiting its penetration depth. Recently, OCT in the mid-infrared (MIR) spectral region has attracted attention with a significantly lower scattering rate than in the near-infrared region. However, the highest reported A-scan rate of MIR-OCT has been 3 kHz, which requires long data acquisition time to take an image, unsatisfying industrial demands for real-time diagnosis. Here, we present a high-speed MIR-OCT system operating in the 3–4 µm region that employs the frequency-swept spectrum detection in OCT technique based on time-stretch infrared spectroscopy. By integrating a broadband femtosecond MIR pulsed laser operating at a repetition rate of 50 MHz, we achieved an A-scan rate of 1 MHz with an axial resolution of 11.6 µm, a 10 dB roll-off depth of about 700 µm, and a sensitivity of 55 dB. As a proof-of-concept demonstration, we imaged the surface of substrates covered by highly scattering paint coatings. The demonstrated A-scan rate surpasses previous state of the art by more than two orders of magnitude, paving the way for real-time NDT of industrial products, cultural assets, and structures.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"130 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141059321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

HISOL: High-energy soliton dynamics enable ultrafast far-ultraviolet laser sources HISOL：高能孤子动力学实现超快远紫外激光源

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-05-13 DOI: 10.1063/5.0206108

Christian Brahms, John C. Travers

引用次数: 0

Double harmonic mode-locking in soliton fiber ring laser acquired through the resonant optoacoustic coupling 通过谐振光声耦合获得孤子光纤环形激光器中的双谐波锁模

IF 5.6 1区物理与天体物理

APL Photonics Pub Date : 2024-05-13 DOI: 10.1063/5.0195623

V. A. Ribenek, P. A. Itrin, D. A. Korobko, A. A. Fotiadi

{"title":"Double harmonic mode-locking in soliton fiber ring laser acquired through the resonant optoacoustic coupling","authors":"V. A. Ribenek, P. A. Itrin, D. A. Korobko, A. A. Fotiadi","doi":"10.1063/5.0195623","DOIUrl":"https://doi.org/10.1063/5.0195623","url":null,"abstract":"Passive harmonic mode-locking of a soliton fiber laser locked to optoacoustic resonance (OAR) in the cavity fiber ensures high-frequency laser operation, high pulse stability, and low timing jitter. However, the pulse repetition rate (PRR) of such lasers is limited to ∼1 GHz for standard fibers due to the available acoustic modes. Here, we address these limitations by demonstrating a soliton fiber laser built from standard fiber components and subjected to double harmonic mode-locking (DHML). As an example, the laser adjusted to operate at the 15th harmonic of its cavity matching the OAR at ∼199 MHz could be driven to operate at a high harmonic of this particular OAR frequency, thus reaching ∼12 GHz. This breakthrough is made possible through controllable optoacoustic interactions in a short, 50 cm segment of unjacketed cavity fiber. We propose that the precise alignment of the laser cavity harmonic and fiber acoustic modes leads to a long-lived narrow-band acoustic vibration. This vibration sets the pace for the pulses circulating in the cavity by suppressing modes that do not conform to the Vernier principle. The surviving modes, equally spaced by the OAR frequency, in cooperation with the gain depletion and recovery mechanism, facilitate the formation of stable high-frequency pulse sequences, enabling DHML. In this process, the OAR rather than the laser cavity defines the elementary step for laser PRR tuning. Throughout the entire PRR tuning range, the soliton fiber laser exhibits enhanced stability, demonstrating supermode suppression levels better than ∼40 dB and picosecond pulse timing jitter.","PeriodicalId":8198,"journal":{"name":"APL Photonics","volume":"191 1","pages":""},"PeriodicalIF":5.6,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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