{"title":"Influence of the Annealing Temperature on ASE Properties and Carrier Dynamics of Perovskite Films","authors":"Wei Wang;Yuan Zhang;Mingze Xia;Meng Zhang;Zhaohong Liu;Li Song;Yang Zhao;Yuanqin Xia","doi":"10.1109/LPT.2025.3585140","DOIUrl":"https://doi.org/10.1109/LPT.2025.3585140","url":null,"abstract":"Quasi-two-dimensional perovskites demonstrate significant potential as laser gain media due to their unique excitonic properties in multilayer configurations. Femtosecond laser spectroscopy techniques, known for their exceptional temporal resolution, allow for the observation of ultrafast dynamic processes at the molecular and atomic levels, surpassing the capabilities of conventional spectroscopic methods. This study employs various spectroscopic methodologies, including stripe light excitation (SLE) and femtosecond time-resolved transient absorption (TA), to investigate the amplified spontaneous emission (ASE) characteristics of Dion-Jacobson type quasi-2D perovskite (PDA)Cs<inline-formula> <tex-math>${}_{text {n}-1}$ </tex-math></inline-formula>PbnBr<inline-formula> <tex-math>${}_{3text {n}+1}$ </tex-math></inline-formula>, along with its correlation to carrier dynamics. The experimental findings indicate that higher annealing temperatures can reduce trap-assisted recombination and Auger recombination, thereby enhancing the efficiency of radiative recombination. However, it is observed that excessively high annealing temperatures may lead to a rapid decline in the performance of the quasi-2D perovskite. The research suggests that optimizing the annealing temperature can improve the optical gain characteristics of perovskite films, thereby supporting their application in the field of laser gain media.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 20","pages":"1169-1172"},"PeriodicalIF":2.3,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144640963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaohong Lan;Yang Jiang;Jing Xu;Jinjian Feng;Yunkun Luo;Qianyou Long
{"title":"Efficient Symmetry-Tunable Triangular-Shaped Waveforms Generation via Time-Domain Synthesis","authors":"Xiaohong Lan;Yang Jiang;Jing Xu;Jinjian Feng;Yunkun Luo;Qianyou Long","doi":"10.1109/LPT.2025.3585247","DOIUrl":"https://doi.org/10.1109/LPT.2025.3585247","url":null,"abstract":"A high-efficiency triangular-shaped waveforms generator is proposed and experimentally demonstrated. Assisted by an optical-optical modulation in a semiconductor optical amplifier under a high bias current, a sinusoidal envelope is transformed into a dark parabolic waveform. This dark parabolic waveform and a delayed bright parabolic waveform are overlapped in a balanced photodetector, yielding two linear functions with slopes of opposite signs, which are jointed together to form the target waveforms. Theoretical analysis and simulations are given in detail. In the experiment, by simply adjusting the delay, triangular-shaped waveforms with tunable symmetry factor ranging from 20% to 80% are successfully generated, showing a good agreement with the theoretical expectations. Compared to the previous schemes based on the harmonics synthesis, this time-domain approach greatly reduces the technical requirement while the flexibility and accuracy is improved.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 19","pages":"1141-1144"},"PeriodicalIF":2.3,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11063328","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Stabilized High-Order Mode Brillouin Random Fiber Laser Using a Self-Matched Dynamic Fiber Grating","authors":"Weiyu Pan;Liang Zhang;Yichun Li;Yu Chen;Caojun Zhang;Jianxiang Wen;Wei Chen;Mengshi Zhu;Heming Wei;Fufei Pang;Tingyun Wang","doi":"10.1109/LPT.2025.3584893","DOIUrl":"https://doi.org/10.1109/LPT.2025.3584893","url":null,"abstract":"We propose and experimentally demonstrate a stable high-order mode (HOM) Brillouin random fiber laser based on randomly distributed Rayleigh scattering in few-mode fibers. Taking advantage of a few-mode erbium-doped fiber-based dynamic fiber grating with self-matched spatial mode, mode hopping of HOM Stokes random laser can be significantly suppressed, benefiting prominent intensity noise reduction and laser frequency stabilization. Results show that, the power fluctuation of the proposed laser with few-mode dynamic fiber grating is reduced by 50%, while the variance of the laser frequency fluctuations within 1000 milliseconds has been optimized down to 0.15. Notably, the LP11 mode of the laser output achieves a purity exceeding 95% with fluctuations reduced by 56.9%. It is believed that the proposed HOM laser would be promising for applications in optical fiber communication and fiber sensing.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 19","pages":"1129-1132"},"PeriodicalIF":2.3,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jingyu Yu;Jiaming Qian;Jun Liu;Songlin Yang;Sorin Melinte;Kemao Qian;Chao Zuo;Ran Ye
{"title":"Microsphere-Integrated Photonic Crystal Sensors for Spatially-Resolved Refractive Index Measurement","authors":"Jingyu Yu;Jiaming Qian;Jun Liu;Songlin Yang;Sorin Melinte;Kemao Qian;Chao Zuo;Ran Ye","doi":"10.1109/LPT.2025.3585430","DOIUrl":"https://doi.org/10.1109/LPT.2025.3585430","url":null,"abstract":"Refractometers based on interferometric methods require sophisticated systems and stable environment. Non-interferometric refractometers can offer advantages in terms of reducing device costs and simplifying device configurations. In this Letter, we proposed a microsphere-integrated photonic crystal (PC) refractometer with a high spatial resolution. The refractometer forms magnified patterns of the PC substrate when immersed in liquid. By invoking the two-dimensional windowed Fourier transform to analyze the patterns, the refractive index of liquid can be determined. The validity of the proposed method is verified by measuring both standard uniform liquids and the dynamic process of oil-water merging, suggesting it is a simple and effective tool for measuring RI with spatially resolved micrometer-scale resolution.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 20","pages":"1173-1176"},"PeriodicalIF":2.3,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yan Wei;Jingya Zhang;Heming Wei;Caixia Jia;Fufei Pang;Shijie Zheng;Carlos Marques
{"title":"Bracket-Diaphragm Coupled Fabry-Perot Acoustic Sensor for Partial Discharge Detection","authors":"Yan Wei;Jingya Zhang;Heming Wei;Caixia Jia;Fufei Pang;Shijie Zheng;Carlos Marques","doi":"10.1109/LPT.2025.3585059","DOIUrl":"https://doi.org/10.1109/LPT.2025.3585059","url":null,"abstract":"We demonstrate a bracket-diaphragm-based Fabry-Perot (FP) cavity fabricated by two-photon 3D printing technique as a highly-sensitive acoustic sensor for the detection of partial discharge. The diaphragm consists of two parts, one is the low-frequency dominant bracket structure, while the other features a high-frequency dominant diaphragm. To achieve high acoustic sensing performance, the whole structure is optimized for mechanical mode-coupling resonance, which can significantly enhance the response to acoustic waves. The sensing performance of the device for acoustic wave detection is investigated. Furthermore, the sensor is utilized for the detection of partial discharge. Results show that the device can detect the acoustic emission waves with frequencies up to 340 kHz and exhibits well-distance responsiveness. With a minimum detectable pressure (MDP) of <inline-formula> <tex-math>$3.81~mu $ </tex-math></inline-formula> <inline-formula> <tex-math>${mathrm {Pa/Hz}}^{mathbf {1/2}}$ </tex-math></inline-formula> at 150 kHz, the sensor shows desirable potential for applications in partial discharge detection of electrical equipment.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 19","pages":"1125-1128"},"PeriodicalIF":2.3,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bo Li;Ming Che;Shenghong Ye;Yuya Mikami;Kazutoshi Kato
{"title":"Demonstration of Optoelectronic THz Beam Tracking Using Real-Time Phase Optimization","authors":"Bo Li;Ming Che;Shenghong Ye;Yuya Mikami;Kazutoshi Kato","doi":"10.1109/LPT.2025.3584618","DOIUrl":"https://doi.org/10.1109/LPT.2025.3584618","url":null,"abstract":"Addressing the critical beam alignment challenge in Terahertz (THz) communications for 6G, this letter details the implementation of 300 GHz beam tracking using an arrayed antenna. Despite the efficiency of beamforming, narrow THz beamwidth demands precise alignment. Our system uniquely combines an optical phased array with a real-time algorithm that optimizes the beam direction based on received power feedback. We experimentally validated the system’s effectiveness. First, successful static beam optimization was demonstrated, achieving a synthesis gain of 11.5 dB, which approaches the theoretical limit. Furthermore, beam tracking was achieved for a receiver moving within an angular range of ±40° at angular velocities up to 3.58 deg/s. Throughout the tracking process, the arrayed antenna demonstrated a stable mean synthesis gain of 9.11 dB. This successful demonstration provides a viable pathway to enhance the robustness and efficiency required for future THz mobile communication networks.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 19","pages":"1109-1112"},"PeriodicalIF":2.3,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Efficient and Stable Electroluminescent Devices From Sn/ErYb Silicate Co-Doped in Silica Film","authors":"Jingjie Zhao;Lixiang Wang;Yangyi Zhang;Teng Sun;Jun Xu;Kunji Chen","doi":"10.1109/LPT.2025.3584049","DOIUrl":"https://doi.org/10.1109/LPT.2025.3584049","url":null,"abstract":"Sn and Er2Si2O7:Yb co-doped SiO2 (SiO2-Sn/ Er2Si2O7:Yb) thin films were successfully fabricated by using the sol-gel method. The Er-related near-infrared (NIR) luminescence performance was significantly enhanced by improving the quality of nanocrystals and introducing the energy transfer process of Yb. The designed electroluminescent device based on SiO2-Sn/Er2Si2O7:Yb film achieved visible and dual-wavelength NIR electroluminescence (EL). The Er-related NIR EL integrated intensity of the optimal device increased by more than 2 times compared to the Yb-free device. The optimal ErYb silicate electroluminescent devices also exhibited excellent performance in threshold voltage (~22 V), power efficiency (<inline-formula> <tex-math>$sim 2.6times 10 ^{-3}$ </tex-math></inline-formula>), and operational stability (>600 min), which is promising for the development of efficient and stable silicon-based NIR light sources.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 19","pages":"1117-1120"},"PeriodicalIF":2.3,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiameng Dong;Zhaohui Wang;Jiayi Dou;Yichen Zhang;Song Yu;Bin Luo
{"title":"Two-Way Fiber-Optic Time Synchronization System Based on Feedforward-Feedback Phase Compensation","authors":"Jiameng Dong;Zhaohui Wang;Jiayi Dou;Yichen Zhang;Song Yu;Bin Luo","doi":"10.1109/LPT.2025.3583783","DOIUrl":"https://doi.org/10.1109/LPT.2025.3583783","url":null,"abstract":"Synchronizing remote frequency references is critical in two-way fiber-optic time synchronization systems. Without dedicated frequency transfer systems, it can be realized via frequency or phase compensation. However, these standalone compensation methods suffer from excessive parameter dependence or poor mitigation of time-varying frequency differences. Therefore, this letter proposes a feedforward-feedback phase compensation scheme integrating frequency compensation as a proactive method for clock difference drift suppression, overcoming single-method limitations while broadening applicability. The proposed method is validated on a laboratory 400 km two-way time synchronization system with a free-running remote oscillator, achieving 17.47 ps@1 s and 1.3 ps@1000 s, demonstrating its potential for precision time-frequency applications.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 19","pages":"1121-1124"},"PeriodicalIF":2.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An Ultra-Narrow High-Power Faraday Laser Locked to the D1 Line of Rubidium","authors":"Tianyi Du;Fubin Luo;Zining Yang;Longfei Jiang;Ruiyun Tang;Qingshan Liu;Huizi Zhao;Rui Wang;Hongyan Wang;Xiaojun Xu","doi":"10.1109/LPT.2025.3583700","DOIUrl":"https://doi.org/10.1109/LPT.2025.3583700","url":null,"abstract":"We reported a new kind of 795 nm ultra-narrow external cavity diode lasers (ECDLs). A Faraday anomalous dispersion optical filter (FADOF) was used to construct the external cavity. The spectrum of the diode laser was strictly locked to the D1-line (~794.98 nm), and the bandwidth (FWHM) was narrowed from 2.5 nm in the free-running case to 0.005 nm (2.5 GHz) with a side mode suppression ratio of 26 dB. The final output power of the diode laser was 58 W, with an external cavity efficiency of 60%. The diode laser with such spectrum characteristics and output power could have wide applications, including biomedical magnetic resonance imaging (MRI), free-space optical communications, spin-exchange optical pumping, fundamental spin physics research, etc.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 20","pages":"1161-1164"},"PeriodicalIF":2.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144640941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Che-Chung Chou;Cheng-Chieh Hsieh;Ko-Han Chen;Yi-Jun Xu;Wang-Yau Cheng;Tyson Lin;Sheng-Hua Lu
{"title":"Simple Hertz-Level Laser Offset Locking by Using a Dual-Bandwidth Digital Band-Pass Filter","authors":"Che-Chung Chou;Cheng-Chieh Hsieh;Ko-Han Chen;Yi-Jun Xu;Wang-Yau Cheng;Tyson Lin;Sheng-Hua Lu","doi":"10.1109/LPT.2025.3583756","DOIUrl":"https://doi.org/10.1109/LPT.2025.3583756","url":null,"abstract":"This letter presents a simple and easy-to-use self-referenced frequency discriminator for laser frequency offset locking. The key component of the “self-referenced” frequency discriminator is a dual bandwidth band-pass filter which is composed of two digital band-pass filters, one having a broader bandwith to provide a large capture range and the other having a narrow bandwidth for tight frequency locking. The digital band-pass filters are based on the PyRPL IQ modules running on a Red Pitaya STEMlab board. All the parameters of the IQ modules can be easily set and adjusted in the PyRPL GUI. To demonstrate the proposed scheme, we offset locked an external cavity diode laser to an iodine-stabilized external cavity diode laser. Their beat note was narrowed down from 500 kHz of the free running to 4 Hz as offset locked. The minimum Allan deviation of the locked offset frequency is 2.4 Hz at 100-s averaging.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 19","pages":"1113-1116"},"PeriodicalIF":2.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}