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Dynamic all-optical memory switching based on atomic optical bistable behavior in a three level Λ-type atomic system 基于三级Λ型原子系统中原子光学双稳态行为的动态全光存储器切换
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-01-18 DOI: 10.1088/1555-6611/ad1aa2
Haiqiang He, Bixuan Fan, Min Xie
{"title":"Dynamic all-optical memory switching based on atomic optical bistable behavior in a three level Λ-type atomic system","authors":"Haiqiang He, Bixuan Fan, Min Xie","doi":"10.1088/1555-6611/ad1aa2","DOIUrl":"https://doi.org/10.1088/1555-6611/ad1aa2","url":null,"abstract":"We theoretically investigate the atomic optical bistability (AOB) in a three-level Λ-type atomic system confined in a unidirectional optical ring cavity. The role of the intensity or detuning of the control field on AOB is explored, and results show that absorption, dispersion, and nonlinearity can be modified significantly by the control field due to quantum coherence and interference in multilevel atomic systems. Thus, tuning the intensity or detuning of the control field can manipulate the switch-up and switch-down thresholds, as well as the area of the bistable hysteresis loop. According to the controllability of AOB, we design various schemes to realize dynamical all-optical switching between the high and low outputs of two bistable curves for a fixed cavity input. In addition, dynamical all-optical memory switching can be implemented by adding a pulse sequence for the intensity or detuning of the control field. For appropriate parameters, such as the cooperative coefficient, the extinction ratio of the switching can be improved dramatically.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139510330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Dynamic laser speckle study on the effect of TiO2 and SiO2 nanoparticles in coatings 涂层中二氧化钛和二氧化硅纳米粒子效应的动态激光斑点研究
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-01-17 DOI: 10.1088/1555-6611/ad1aa1
R Balamurugan, A R Arul, H B Ramalingam, R Venckatesh
{"title":"Dynamic laser speckle study on the effect of TiO2 and SiO2 nanoparticles in coatings","authors":"R Balamurugan, A R Arul, H B Ramalingam, R Venckatesh","doi":"10.1088/1555-6611/ad1aa1","DOIUrl":"https://doi.org/10.1088/1555-6611/ad1aa1","url":null,"abstract":"The coatings of TiO<sub>2</sub> and SiO<sub>2</sub> nanoparticles mixed with latex paint on the sample are studied. The sample coin is coated primarily with latex paint alone and then with additives such as TiO<sub>2</sub> and SiO<sub>2</sub> nanoparticles separately with the same percentage of concentration. The sample is illumined by a coherent source of light and produces tiny bright and dark fingerprints by the interference effect of the scattered laser. This cigar-like granular pattern image is known as a speckle pattern which is recorded continuously during the drying process of paint. The modified properties due to the additives in paint on the coin are studied by speckle photography. The surface profile plotting method is adopted for the roughness analysis on the sample. Histogram and gray level co-occurrence matrix perform the intensity analysis in the paint. The brightness examine by means of bright/dark pixel counting method.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"73 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139510280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 power narrow linewidth fiber laser based on superfluorescent white noise modulation 基于超荧光白噪声调制的高功率窄线宽光纤激光器
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-01-09 DOI: 10.1088/1555-6611/ad12b2
Astro Ltd, X. Shan, T. Hou, F. Li, R. Zhu
{"title":"High power narrow linewidth fiber laser based on superfluorescent white noise modulation","authors":"Astro Ltd, X. Shan, T. Hou, F. Li, R. Zhu","doi":"10.1088/1555-6611/ad12b2","DOIUrl":"https://doi.org/10.1088/1555-6611/ad12b2","url":null,"abstract":"High power narrow linewidth fiber lasers have important applications in the fields of national defense, military and industrial intelligent manufacturing. At present, the power enhancement of narrow linewidth lasers is limited by the nonlinear and thermal effects of fiber, among which the stimulated Brillouin scattering (SBS) effect is highly destructive due to its low threshold. The SBS effect is easily produced using a single frequency laser as the seed of a high power narrow linewidth laser directly. The Brillouin scattering threshold can be effectively increased by broadening the spectrum line at a single frequency. A spectral broadening technique for single frequency lasers based on superfluorescent white noise modulation was proposed. The broadband characteristics of the amplified spontaneous emission light source to generate noise voltage on the photodetector was employed, and the lithium niobate electro-optical modulator was driven to perform broadband phase modulation in a single frequency laser. The phase modulation broadening of the single frequency laser was carried out using superfluorescent white noise. Different linewidth broadening effects of single frequency lasers were realized by changing the amplitude of the white noise. An experimental platform of the four-stage main oscillation power amplification structure was built, and a high power narrow linewidth laser with output power of 2 kW and spectral linewidth of 0.15 nm (10 dB) was realized, which effectively inhibited the SBS effect of the laser.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"31 13","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139442939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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-broadband high-efficiency solar absorber based on Ti-GaAs-Au structure for UV to near-infrared spectral range 基于 Ti-GaAs-Au 结构的超宽带高效太阳能吸收器，用于紫外至近红外光谱范围
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-01-04 DOI: 10.1088/1555-6611/ad1503
Jincheng Wang, Hengli Feng, Yang Gao
{"title":"Ultra-broadband high-efficiency solar absorber based on Ti-GaAs-Au structure for UV to near-infrared spectral range","authors":"Jincheng Wang, Hengli Feng, Yang Gao","doi":"10.1088/1555-6611/ad1503","DOIUrl":"https://doi.org/10.1088/1555-6611/ad1503","url":null,"abstract":"In this study, we propose an ultra-broadband solar absorber composed of a trapezoidal base, an outer circular ring, and four nano-cylinders. The absorber has a covered bandwidth range of 300–4000 nm and a temperature range of 373–973 K. The average absorptance within the mentioned wavelength range is over 96.52%, and the efficiency of solar energy thermal conversion is above 0.9 at 373–973 K under a solar concentration factor of 1000, with a maximum efficiency of 0.9644. Analysis of its absorption mechanism using the finite-difference time-domain method indicates that the proposed solar absorber’s outstanding absorption performance is due to the excitation of surface plasmon polaritons, localized surface plasmon resonances, and cavity resonances enhanced electromagnetic fields. This result has also been validated by the impedance matching theory. Moreover, the proposed solar absorber exhibits insensitivity to different polarization angles and maintains a high absorption effect in the range of 0°–70° incidence angle. The designed solar absorber has potential applications in areas such as seawater purification, wastewater treatment, and steam power generation systems.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"18 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139093349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Quantum super-resolution with balanced homodyne detection in low-earth-orbit 低地球轨道平衡同调探测量子超分辨率
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-28 DOI: 10.1088/1555-6611/ad1750
Ronakraj K Gosalia, Robert Malaney, Ryan Aguinaldo, Jonathan Green
{"title":"Quantum super-resolution with balanced homodyne detection in low-earth-orbit","authors":"Ronakraj K Gosalia, Robert Malaney, Ryan Aguinaldo, Jonathan Green","doi":"10.1088/1555-6611/ad1750","DOIUrl":"https://doi.org/10.1088/1555-6611/ad1750","url":null,"abstract":"Quantum super-resolution involves resolving two sources below the Rayleigh limit using quantum optics. Such a technique would allow high-precision inter-satellite positioning and tracking on communication and navigation constellations. Due to the size, weight and power constraints typical of low-earth-orbit (LEO) satellites, a simple solution is often preferred. Here, we show that a balanced homodyne detection (BHD) setup using a shaped single-mode local oscillator can achieve super-resolution despite typical photonic losses. We further analyze the impact of a fluctuating and fixed centroid misalignment due to satellite pointing issues, and find that fixed misalignment is comparatively more detrimental to the performance of a BHD setup. Thus, our study provides a practical assessment of BHD to achieve super-resolution on a modern LEO satellite platform. Finally, we discuss how our analysis can be extended to stellar sources for astronomical applications.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"17 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139093418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Wavelength-stabilized figure-of-9 thulium-doped all-fiber laser emitting 560 fs pulses 波长稳定的 9 号掺铥全光纤激光器发射 560 fs 脉冲
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-22 DOI: 10.1088/1555-6611/ad1504
Moritz Bartnick, G. Bharathan, T. Goebel, R. G. Krämer, Stefan Nolte, Camille-Sophie Brès
{"title":"Wavelength-stabilized figure-of-9 thulium-doped all-fiber laser emitting 560 fs pulses","authors":"Moritz Bartnick, G. Bharathan, T. Goebel, R. G. Krämer, Stefan Nolte, Camille-Sophie Brès","doi":"10.1088/1555-6611/ad1504","DOIUrl":"https://doi.org/10.1088/1555-6611/ad1504","url":null,"abstract":"We demonstrate a figure-of-9 all-fiber thulium-doped laser (TDFL) that generates 560 fs long pulses at 1948 nm wavelength. In order to achieve self-starting passive mode-locking, we utilize an in-fiber Faraday rotator to induce a nonreciprocal phase shift. To the best of our knowledge, this is the first all-fiber TDFL that combines an artificial saturable absorber (SA) with a chirped fiber Bragg grating (CFBG) as a wavelength-selective reflector. This cavity design is an excellent candidate to pump nonlinear processes such as supercontinuum and frequency comb generation since it does not require any SA material that degrades over time for mode-locking and could be made wavelength-tuneable via the CFBG.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"28 11","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138947282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Manipulating helical phase of HHG vortex with atomic states 用原子态操纵 HHG 涡旋的螺旋相位
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-21 DOI: 10.1088/1555-6611/ad1505
Kecheng Liu, Guizhong Zhang, Shenghua Zhang, Wei Shi, Jianquan Yao
{"title":"Manipulating helical phase of HHG vortex with atomic states","authors":"Kecheng Liu, Guizhong Zhang, Shenghua Zhang, Wei Shi, Jianquan Yao","doi":"10.1088/1555-6611/ad1505","DOIUrl":"https://doi.org/10.1088/1555-6611/ad1505","url":null,"abstract":"By deploying the strong-field approximation theory, we perform numerical simulation on atomic high-order harmonic generation (HHG) of hydrogen and HHG vortices generated by hydrogen layer. Our results show that the atomic HHG spectra demonstrate peak-shifting and the helical phase of the HHG vortex can be manipulated with initial states of atoms, all ionized by oppositely polarized bicircular ω and 2ω Laguerre–Gaussian fields. The HHG peaks shift to higher frequency by ω if the initial state is switched from ψ100 to ψ211 , and the HHG peaks shift to lower frequency by ω if the initial state is switched from ψ100 to ψ21−1 , the final state is always the ground state ψ100 . The helical phase patterns of the HHG vortices are investigated in connection with the atomic HHG peak-shifting and the angular momentum conservation law. In addition, we observe that the fourth HHG harmonic is strongly dependent on the 2ω field but weakly on the ω field for an initial atomic state of magnetic quantum number −1.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"96 12","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138951294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Tunable wide spacing all-fiber dual-wavelength holmium-doped fiber laser using a Lyot filter operating above 2 µm 使用工作波长超过 2 µm 的 Lyot 滤波器的可调谐宽间距全光纤双波长掺钬光纤激光器
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-08 DOI: 10.1088/1555-6611/ad109a
Astro Ltd, H. Ahmad, J. W. Chiam, M. Z. Samion, M. K. A. Zaini, M. Z. Zulkifli, K. Thambiratnam
{"title":"Tunable wide spacing all-fiber dual-wavelength holmium-doped fiber laser using a Lyot filter operating above 2 µm","authors":"Astro Ltd, H. Ahmad, J. W. Chiam, M. Z. Samion, M. K. A. Zaini, M. Z. Zulkifli, K. Thambiratnam","doi":"10.1088/1555-6611/ad109a","DOIUrl":"https://doi.org/10.1088/1555-6611/ad109a","url":null,"abstract":"In this work, we successfully demonstrated an all-fiber, dual-wavelength holmium-doped fiber laser (HDFL) with a tunable wavelength spacing range of 8 nm to 24 nm. The HDFL utilizes a Lyot filter to obtain a stable dual wavelength output, with the Lyot filter being constructed from a polarizer, a 20 m polarizing maintaining fiber (PMF) and two polarization controllers (PCs). The dual-wavelength HDFL has an operating wavelength range from 2072.1 nm to 2097.2 nm and a maximum spacing of 24 nm between the lasing wavelengths as well as a signal-to-noise ratio of up to 45 dB and a side mode suppression ratio as low as 0.15 dB. The HDFL is highly stable, with the lasing output have a low power fluctuation of only 2.3 dB over a continuous operation period of 75 min. The proposed HDFL would have substantial applications as a low cost laser source for sensing applications beyond the 2 µm region, particularly those that require a control signal.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"22 21","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138589392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Enhancing the capacity of quantum dense coding from correlated amplitude damping channel via non-Hermitian operation 通过非赫米提操作提高相关振幅阻尼信道量子密集编码的容量
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-08 DOI: 10.1088/1555-6611/ad109b
Yang Leng, Fei Chen
{"title":"Enhancing the capacity of quantum dense coding from correlated amplitude damping channel via non-Hermitian operation","authors":"Yang Leng, Fei Chen","doi":"10.1088/1555-6611/ad109b","DOIUrl":"https://doi.org/10.1088/1555-6611/ad109b","url":null,"abstract":"Using the non-Hermitian operation approach, we propose a scheme to protect and enhance quantum dense coding from correlated amplitude damping (AD) decoherence. In contrast to the results of memoryless AD channel, we show that the memory effects play a significant role in the suppression of quantum dense coding sudden death. Moreover, we find that the damaged quantum dense coding can be effectively enhanced by using the non-Hermitian operation. Furthermore, the freezing phenomenon of quantum dense coding can be detected by using the optimal non-Hermitian operation.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"55 39","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138588225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Reconstruction method of computational ghost imaging under atmospheric turbulence based on deep learning 基于深度学习的大气湍流下计算鬼影成像重建方法
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-05 DOI: 10.1088/1555-6611/ad0ebf
Jingyao Xia, Leihong Zhang, Yunjie Zhai, Yiqiang Zhang
{"title":"Reconstruction method of computational ghost imaging under atmospheric turbulence based on deep learning","authors":"Jingyao Xia, Leihong Zhang, Yunjie Zhai, Yiqiang Zhang","doi":"10.1088/1555-6611/ad0ebf","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0ebf","url":null,"abstract":"Ghost imaging, as an emerging imaging method, has great advantages in harsh environment with its off-object imaging characteristics. In this paper, we use a turbulence model based compressive sensing computational ghost imaging system to simulate atmospheric turbulence, analyze the effects of various factors on the imaging results, and recover the images under extreme turbulence conditions using conditional generation adversarial network, which can finally recover the images well. The simulation results show that the image reconstruction method proposed in this paper can recover the image well under the condition of very low sampling rate (1.56%).","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"60 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138598379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
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