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Optimization of polarization spectroscopy signal for laser-frequency stabilization 优化偏振光谱信号，实现激光频率稳定
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-15 DOI: 10.1088/2040-8986/ad7516
Rajni Bala, Joyee Ghosh and Vivek Venkataraman
{"title":"Optimization of polarization spectroscopy signal for laser-frequency stabilization","authors":"Rajni Bala, Joyee Ghosh and Vivek Venkataraman","doi":"10.1088/2040-8986/ad7516","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7516","url":null,"abstract":"We experimentally generate polarization spectroscopy (error) signals corresponding to the D2-line hyperfine transitions, of 87Rb, and of 85Rb, and show that the strongest error signals correspond to the closed hyperfine transitions (oscillator strength ), and , respectively. We make the generated error signal robust to fluctuations in external parameters by finding optimum values for the vapor cell temperature and pump-probe intensities at two different beam diameters. We further employ these optimized error signals to directly (without the need for frequency/phase modulation) lock the laser frequency—reducing the rms drift/linewidth from MHz to kHz, when measured over a min duration. In addition, by comparing theoretically calculated and experimentally measured error signals for the pump intensities ranging from (where, mW cm−2 is the two-level saturation intensity for the Rb D2-line transitions), we discuss the applicability and limitations of existing numerical and analytical approaches based on a full multi-level rate equation model for polarization spectroscopy.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"32 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258990","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
A theoretical study of quantum coherence and plasmon-enhanced diffraction in practical hybrid systems including semiconductor quantum dots and metallic nanoparticles 包括半导体量子点和金属纳米粒子在内的实用混合系统中的量子相干性和等离子体增强衍射理论研究
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-11 DOI: 10.1088/2040-8986/ad7740
Zeynab Maleki and Tayebeh Naseri
{"title":"A theoretical study of quantum coherence and plasmon-enhanced diffraction in practical hybrid systems including semiconductor quantum dots and metallic nanoparticles","authors":"Zeynab Maleki and Tayebeh Naseri","doi":"10.1088/2040-8986/ad7740","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7740","url":null,"abstract":"In this work, we theoretically study a novel strategy for electromagnetically induced gratings in a complex hybrid system consisting of semiconductor quantum dots (SQDs) and metallic nanoparticles (MNPs). The plasmonic resonances of MNPs and the quantum coherence of SQDs enable the generation of unique optical phenomena such as electromagnetically induced transparency via interactions with light. Through surface plasmon interactions and quantum dot interdot tunneling, the modification of light diffraction efficiency into higher orders is achievable. Doppler broadening and nonlocality are included in the model to offer a more realistic picture of the system’s behavior in real-world scenarios. Our proposed model shows significant promise for applications in sensing technologies and nanophotonics, where it has the potential to enhance sensitivity and improve the performance of optical devices.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"9 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180992","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
Highly coherent mid-infrared wideband supercontinuum generation by a silica cladded silicon nitride core buried waveguide 通过硅包覆氮化硅芯埋入式波导产生高相干中红外宽带超连续真空
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-09 DOI: 10.1088/2040-8986/ad751a
Somen Adhikary, Dipankar Ghosh and Mousumi Basu
{"title":"Highly coherent mid-infrared wideband supercontinuum generation by a silica cladded silicon nitride core buried waveguide","authors":"Somen Adhikary, Dipankar Ghosh and Mousumi Basu","doi":"10.1088/2040-8986/ad751a","DOIUrl":"https://doi.org/10.1088/2040-8986/ad751a","url":null,"abstract":"Optical waveguides with semiconductor cores are drawing considerable research interest in the domain of supercontinuum (SC) generation in recent times. In this work, we design a square-core silicon nitride buried waveguide with a silica-clad, aiming for a wideband spectrum generation in the mid-IR region when operated at the standard telecommunication wavelength of 1550 nm. Among different such silicon nitride square-core buried waveguides, we propose a typical design with dimensions of 400 nm × 400 nm along its height and width, capable of producing a highly coherent broadband intensity spectrum ranging from 810 nm to 5441 nm after propagating through just a few millimeters of the waveguide. The group velocity dispersion maintains minimal value over a broad wavelength range in the mid-IR region, while the nonlinear coefficient is estimated to be sufficiently high. The nonlinear pulse propagation through such a waveguide leads to achieving an SC spanning over 2.76 octaves, sufficiently broader than previously reported silicon nitride-based waveguides. Furthermore, our calculations confirm the highly coherent nature of the generated SC. To the best of our knowledge, this is the first report of SC generation maintaining a high degree of coherence over such a wide wavelength range in the mid-IR zone using a square-core silicon nitride buried waveguide.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"54 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181001","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
A generalised entropic measure of steering using Tsallis entropies and the relationship with existent steering criteria 利用查里斯熵对转向进行广义熵测量，以及与现有转向标准的关系
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-09 DOI: 10.1088/2040-8986/ad7157
A Elena Piceno-Martínez and Laura E C Rosales-Zárate
{"title":"A generalised entropic measure of steering using Tsallis entropies and the relationship with existent steering criteria","authors":"A Elena Piceno-Martínez and Laura E C Rosales-Zárate","doi":"10.1088/2040-8986/ad7157","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7157","url":null,"abstract":"EPR steering is an asymmetric quantum correlation, as such, it is an important resource for quantum information protocols, like those used in quantum key distribution that are of tremendous relevance nowadays. The security of the aforementioned protocols can be shown by using entropic uncertainty measures, which are based on quantum information quantities, among which the entropies are found. In this work, we propose an entropic measure of steering, starting from the detection of steering given in a previous entropic uncertainty relation-based criterion, as well as using a generalised entropy, the Tsallis entropies. We define the entropic measure of steering in terms of an indicator, a quantity depending on the entropies of the measurements of the system, which assigns a value to the steering content of quantum states, while also comprising the asymmetry property of steering. We investigate the properties of the proposed quantity as a measure of steering and its asymmetry and show how it can be used for specific examples. For instance, a class of noisy two-qubit states that includes the Werner states is used to demonstrate the potential of such a proposal. Furthermore, a comparison is also made with the detection of steering in these states using existing steering criteria and the amount of steering a geometric measure for the Werner state gives.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"10 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180997","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
Time division interferometer setups 时分干涉仪装置
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-09 DOI: 10.1088/2040-8986/ad760f
M Fernandez-Guasti
{"title":"Time division interferometer setups","authors":"M Fernandez-Guasti","doi":"10.1088/2040-8986/ad760f","DOIUrl":"https://doi.org/10.1088/2040-8986/ad760f","url":null,"abstract":"A time division interferometer (TDI) in the optical regime is presented, where a wavetrain is temporally split into two distinct parts that are superimposed at a subsequent stage. At any one time, the photons have no alternatives, only one possible path is possible. There is no path bifurcation in the setup, i.e. no ‘Y’ where the photons can take left or right. The photons choice, if any, is to arrive/collapse before or after the time t1 when the time modulated medium changes its state. In time-varying media, as energy can be exchanged between the wave and medium, the wave frequency is modified. Thus, the diverted photons become doubly tagged, in their wave vector direction as well as their frequency. A streak camera detector array resolves both, the fringe pattern as well as the frequency beats, in a space versus time interferogram. This apparatus has temporal resolution and spatial resolution. Several TDI configurations are described, two of them are implemented: a spatio-temporal interferometer where the ‘which path’ criterion is readily observed and an all temporal TDI where only temporal interference is present. Novel possibilities of TDI schemes are discussed.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"30 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180996","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
An approach to generate cross-polarization modulation-enabled optical frequency comb with enhanced spectral flatness in traveling-wave semiconductor optical amplifiers 在行波半导体光放大器中生成具有增强光谱平坦性的交叉偏振调制光频率梳的方法
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-09 DOI: 10.1088/2040-8986/ad6f24
Priyanka Verma and Sukhbir Singh
{"title":"An approach to generate cross-polarization modulation-enabled optical frequency comb with enhanced spectral flatness in traveling-wave semiconductor optical amplifiers","authors":"Priyanka Verma and Sukhbir Singh","doi":"10.1088/2040-8986/ad6f24","DOIUrl":"https://doi.org/10.1088/2040-8986/ad6f24","url":null,"abstract":"This paper proposes a method for generating an optical frequency comb (OFC) using the cross-polarization modulation (XPolM) effect in a traveling-wave semiconductor optical amplifier (TW-SOA). The TW-SOA acted as a lumped amplifier, enabling pulse generation within the comb. The proposed method of OFC generation achieved a comb spectrum with 51 lines and a maximum power deviation of 1.8 dB, indicating excellent spectral flatness. The proposed approach effectively utilized XPolM in a TW-SOA to create broad flat OFCs. The effectiveness of XPolM depends on various SOA parameters, such as pump and signal powers, and the confinement factor. To understand the XPolM-enabled OFC behavior, various parameters, such as input polarization, bias current, SOA confinement factor, and carrier density, have been optimized. These parameters significantly influenced the generated comb spectrum. This study also provides valuable insights into optimizing comb characteristics through theoretical analysis. The proposed OFC generation was simulated using an OptiSystem simulator. This has paved the way for the potential use of the comb as a multichannel source in various optical devices.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"114 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180994","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
Breaking efficiency-bandwidth limits of integrated silicon modulator using rib waveguide slab region doping design 利用肋状波导片区掺杂设计打破集成硅调制器的效率-带宽限制
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-06 DOI: 10.1088/2040-8986/ad7519
Yifei Chen, Mingxin Liu, Hongsheng Niu, Chen Guo, Shangqing Shi, Wei Cheng, Jin Wang, Qichao Wang, Wanghua Zhu, Guohua Hu, Binfeng Yun
{"title":"Breaking efficiency-bandwidth limits of integrated silicon modulator using rib waveguide slab region doping design","authors":"Yifei Chen, Mingxin Liu, Hongsheng Niu, Chen Guo, Shangqing Shi, Wei Cheng, Jin Wang, Qichao Wang, Wanghua Zhu, Guohua Hu, Binfeng Yun","doi":"10.1088/2040-8986/ad7519","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7519","url":null,"abstract":"Doping optimization in the slab waveguide region of a silicon photonic (SiP) modulator has always been considered to balance the optical loss and electrical resistance–capacitance constant. We found that the AC PN junction capacitance could be significantly decreased by specific doping concentrations in the slab areas. Benefiting from this effect, microwave losses are reduced and the electro-optic (EO) bandwidth is increased. As a proof-of-concept, we propose a silicon modulator based on a conventional lateral PN junction with optimized doping in the waveguide slab region. The simulation results show that a 3 dB-EO bandwidth exceeds 100 GHz can be achieved with a modulation length of 2 mm. In addition, the modulation efficiencies are 1.26 V·cm and 1.45 V·cm under −4 V bias and −6 V bias, respectively. This design shows the potential of high-speed signal transmission in SiPs.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"32 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181002","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
Integrated optics: conventional Mach–Zehnder interferometer configuration versus loop terminated Mach–Zehnder interferometer configuration–a perspective 集成光学：传统马赫-泽恩德干涉仪配置与环路端接马赫-泽恩德干涉仪配置--透视
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-06 DOI: 10.1088/2040-8986/ad7515
Muhammad Ali Butt
{"title":"Integrated optics: conventional Mach–Zehnder interferometer configuration versus loop terminated Mach–Zehnder interferometer configuration–a perspective","authors":"Muhammad Ali Butt","doi":"10.1088/2040-8986/ad7515","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7515","url":null,"abstract":"This paper presents a comparative analysis of the conventional Mach–Zehnder interferometer (MZI) configuration and the loop-terminated MZI (LT-MZI) configuration, emphasizing their respective advantages and utilization in sensing applications. The conventional MZI, renowned for its simplicity and versatility, is contrasted with the LT-MZI, which incorporates a loop termination to enhance sensitivity and spectral performance. Through a detailed examination of design principles, operational mechanisms, and performance metrics, it is shown that the LT-MZI configuration offers superior sensitivity and improved interference pattern control, making it particularly suitable for high-precision sensing applications. This perspective provides valuable insights into the selection and optimization of MZI configurations for specific photonic sensing needs.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"24 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180998","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
Compact passive system for speckle-free uniform illumination in RGB laser projectors based on incoherent focusing 基于非相干聚焦的 RGB 激光投影仪无斑点均匀照明紧凑型无源系统
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-06 DOI: 10.1088/2040-8986/ad7517
Anatoliy Lapchuk, Olexander Prygun, Ivan Gorbov, Yuriy Borodin, Andriy Kryuchyn, Olexander Butok, Yevhenii Morozov
{"title":"Compact passive system for speckle-free uniform illumination in RGB laser projectors based on incoherent focusing","authors":"Anatoliy Lapchuk, Olexander Prygun, Ivan Gorbov, Yuriy Borodin, Andriy Kryuchyn, Olexander Butok, Yevhenii Morozov","doi":"10.1088/2040-8986/ad7517","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7517","url":null,"abstract":"A theoretical analysis of the hardware mechanisms for subjective speckle suppression in RGB laser projectors has revealed that achieving a compact speckle-free passive laser illumination system with uniform illumination requires simultaneous reduction of temporal, spatial, and polarization coherence of the illumination laser beam, along with light intensity homogenization. To address this, we propose a compact passive optical scheme based on incoherent focusing of the laser beam using arrays of prisms with varying heights. The system also incorporates depolarization of a portion of the laser beam and an optical diffractive optical element employing a pseudo-random binary sequence to enhance speckle reduction and improve uniform illumination quality. We demonstrate that such a system can be assembled using readily available laser light sources and optical elements, and its operational principle is experimentally validated.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"21 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180999","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
Real-time full Stokes quantitative imaging with a pixelated polarization camera 利用像素化偏振相机进行实时全斯托克斯定量成像
IF 2.1 4区 物理与天体物理
Journal of Optics Pub Date : 2024-09-06 DOI: 10.1088/2040-8986/ad7518
Kaiquan Chen, Vinu R V, Dongyang Liao, Miaomiao Tang, Ziyang Chen, Jixiong Pu
{"title":"Real-time full Stokes quantitative imaging with a pixelated polarization camera","authors":"Kaiquan Chen, Vinu R V, Dongyang Liao, Miaomiao Tang, Ziyang Chen, Jixiong Pu","doi":"10.1088/2040-8986/ad7518","DOIUrl":"https://doi.org/10.1088/2040-8986/ad7518","url":null,"abstract":"We propose and experimentally demonstrate a quantitative full Stokes parameter extraction system to address the intrinsic constraints of conventional polarization imaging systems regarding real-time-imaging and characterization of polarization features. The simultaneous extraction of all four Stokes parameters is employed by designing a compact optical scheme with two equal intensity parallelly propagating polarized beams generated prior to the detection with a polarization camera. Moreover, the approach utilizes the polarization multiplexing feature of the pixelated camera for the design of the real-time full Stokes parameter extraction system. The stability and reliability of the system are verified through rigorous testing on standard half-wave plates and quarter wave plates. Additionally, the quantitative imaging capability of the technique is tested with a standard birefringent resolution target. Finally, the efficacy of the approach in real-time imaging and characterization is demonstrated by extracting the polarization dynamics of an object coded on a liquid crystal panel.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"59 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181000","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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