An analytic equation interpreting the intensity of ultrasound-modulated scattering light is derived, based on diffusion theory and previous explanations of the intensity modulation mechanism. Furthermore, an experimen...An analytic equation interpreting the intensity of ultrasound-modulated scattering light is derived, based on diffusion theory and previous explanations of the intensity modulation mechanism. Furthermore, an experiment of ultrasonic modulation of incoherent light in a scattering medium is developed. This analytical model agrees well with experimental results,which confirms the validity of the proposed intensity modulation mechanism. The model supplements the existing research on the ultrasonic modulation mechanism of scattering light.展开更多
Stimulated Raman scattering(SRS)excited by incoherent light is studied via particle-in-cell simulations.It is shown that a large bandwidth of incoherent light can reduce the growth of SRS and electron heating consider...Stimulated Raman scattering(SRS)excited by incoherent light is studied via particle-in-cell simulations.It is shown that a large bandwidth of incoherent light can reduce the growth of SRS and electron heating considerably in the linear stage.However,different components of the incoherent light can be coupled by the Langmuir waves,so that stimulated Raman backward scattering can develop.When the bandwidth of incoherent light is larger than the Langmuir wave frequency,forward SRS can be seeded between different components of the incoherent light.The incoherent light can only increase the time duration for nonlinear saturation but cannot diminish the saturation level obviously.展开更多
A new method for recharging active medical implant（AMI）in vitro based on incoherent light source and results of the simulation experiments are proposed.Firstly,the models of the AMI recharging method based on incohe...A new method for recharging active medical implant（AMI）in vitro based on incoherent light source and results of the simulation experiments are proposed.Firstly,the models of the AMI recharging method based on incoherent light source in vitro are developed,which include the models of an incoherent light source and skin tissue.Secondly,simulation experiments of the incoherent light source of the AMI recharging process in vitro based on the Monte Carlo（MC）method are carried out.Finally,absorbed fractions of different layers and distributions of density along x axis of the tissue model and other important conclusions have been achieved.展开更多
Links and knots are exotic topological structures that have garnered significant interest across multiple branches of natural sciences.Coherent links and knots,such as those constructed by phase or polarization singul...Links and knots are exotic topological structures that have garnered significant interest across multiple branches of natural sciences.Coherent links and knots,such as those constructed by phase or polarization singularities of coherent light,have been observed in various three-dimensional optical settings.However,incoherent links and knots—knotted or connected lines of coherence singularities—arise from a fundamentally different concept.They are"hidden"in the statistic properties of a randomly fluctuating field,making their presence often elusive or undetectable.Here,we theoretically construct and experimentally demonstrate such topological entities of incoherent light.By leveraging a state-of-the-art incoherent modal-decomposition scheme,we unveil incoherent topological structures from fluctuating light speckles,including Hopf links and Trefoil knots of coherence singularities that are robust against coherence and intensity fluctuations.Our work is applicable to diverse wave systems where incoherence or practical coherence is prevalent,and may pave the way for design and implementation of statistically-shaped topological structures for various applications such as high-dimensional optical information encoding and optical communications.展开更多
We are at an inflection point in our control of light,beyond 2D transverse intensity patterns and towards tailored light in space and time,for complete 4D control.When new degrees of freedom are added to the mix,the p...We are at an inflection point in our control of light,beyond 2D transverse intensity patterns and towards tailored light in space and time,for complete 4D control.When new degrees of freedom are added to the mix,the potential is enormous.It is novel spatiotemporal optical wavepackets that are lighting the way to this exciting future.Controlling light can be traced back thousands of years,with stories of directing sunlight from mirrors to burn attacking ships,an early form of incoherent light shaping[1].In this example,when light is added to light,the outcome is proportionally more light.This paradigm is broken when the light can be treated as coherent waves:light added to light can result in darkness.Thomas Young did exactly this to create spatial intensity structure in the form of“fringes”.Moving beyond just two displaced splits,his notion of fringes can be generalized to any geometry and any degree of freedom[2].His experiment revealed just how easy it is to control the spatial structure of light by simply adding plane waves,initially in the transverse plane for 2D structured light in intensity,but now in more abstract degrees of freedom of light[3].展开更多
Interplay between dispersion and nonlinearity in optical fibers is a fundamental research topic of nonlinear fiber optics.Here we numerically and experimentally investigate an incoherent continuous-wave(CW)optical fie...Interplay between dispersion and nonlinearity in optical fibers is a fundamental research topic of nonlinear fiber optics.Here we numerically and experimentally investigate an incoherent continuous-wave(CW)optical field propagating in the fiber with normal dispersion,and introduce a distinctive spectral evolution that differs from the previous reports with coherent mode-locked fiber lasers and partially coherent Raman fiber lasers[Nat.Photonics 9,608(2015).].We further reveal that the underlying physical mechanism is attributed to a novel interplay between groupvelocity dispersion(GVD),self-phase modulation(SPM)and inverse four-wave mixing(IFWM),in which SPM and GVD are responsible for the first spectral broadening,while the following spectral recompression is due to the GVD-assisted IFWM,and the eventual stationary spectrum is owing to the dominant contribution of GVD effect.We believe this work can not only expand the light propagation in the fiber to a more general case and help advance the physical understanding of light propagation with different statistical properties,but also benefit the applications in sensing,telecommunications and fiber lasers.展开更多
We demonstrate the spectroscopy of incoherent light with subdiffraction resolution.In a proof-of-principle experiment,we analyze the spectrum of a pair of incoherent pointlike sources whose separation is below the dif...We demonstrate the spectroscopy of incoherent light with subdiffraction resolution.In a proof-of-principle experiment,we analyze the spectrum of a pair of incoherent pointlike sources whose separation is below the diffraction limit.The two sources mimic a planetary system,with a brighter source for the star and a dimmer one for the planet.Acquiring spectral information about the secondary source is difficult because the two images have a substantial overlap.This limitation is solved by leveraging a structured measurement based on spatial-mode demultiplexing,where light is first sorted in its Hermite–Gaussian components in the transverse field then measured by photon detection.This allows us to effectively decouple the photons coming from the two sources.An application is suggested to enhance the exoplanets’atmosphere spectroscopy.A number of experiments of super-resolution imaging based on spatial demultiplexing have been conducted in the past few years,with promising results.Here,for the first time to the best of our knowledge,we extend this concept to the domain of spectroscopy.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.61178089)the Key Program of Science and Technology of Fujian Province,China(Grant No.2011Y0019)the Educational Department of Fujian Province,China(Grant No.JA13074)
文摘An analytic equation interpreting the intensity of ultrasound-modulated scattering light is derived, based on diffusion theory and previous explanations of the intensity modulation mechanism. Furthermore, an experiment of ultrasonic modulation of incoherent light in a scattering medium is developed. This analytical model agrees well with experimental results,which confirms the validity of the proposed intensity modulation mechanism. The model supplements the existing research on the ultrasonic modulation mechanism of scattering light.
基金This work was supported in part by the National Science Foundation of China(Grant Nos.11421064,11374209,11405107 and 11374210).
文摘Stimulated Raman scattering(SRS)excited by incoherent light is studied via particle-in-cell simulations.It is shown that a large bandwidth of incoherent light can reduce the growth of SRS and electron heating considerably in the linear stage.However,different components of the incoherent light can be coupled by the Langmuir waves,so that stimulated Raman backward scattering can develop.When the bandwidth of incoherent light is larger than the Langmuir wave frequency,forward SRS can be seeded between different components of the incoherent light.The incoherent light can only increase the time duration for nonlinear saturation but cannot diminish the saturation level obviously.
基金Supported by the Excellent Young Scholars Research Fund of Beijing Institute of Technology(3040012211310)the Basic Research Fund of Beijing Institute of Technology(20120442010)
文摘A new method for recharging active medical implant（AMI）in vitro based on incoherent light source and results of the simulation experiments are proposed.Firstly,the models of the AMI recharging method based on incoherent light source in vitro are developed,which include the models of an incoherent light source and skin tissue.Secondly,simulation experiments of the incoherent light source of the AMI recharging process in vitro based on the Monte Carlo（MC）method are carried out.Finally,absorbed fractions of different layers and distributions of density along x axis of the tissue model and other important conclusions have been achieved.
基金supported by the National Key Research and Development Program of China(No.2022YFA1404800)National Natural Science Foundation of China(No.12174280,No.12204340,No.12192254,No.92250304,No.12434012,No.W2441005)Priority Academic Program Development of Jiangsu Higher Education Institutions,and Postgraduate Research&Practice Innovation Programof Jiangsu Province(KYCX24_3287).
文摘Links and knots are exotic topological structures that have garnered significant interest across multiple branches of natural sciences.Coherent links and knots,such as those constructed by phase or polarization singularities of coherent light,have been observed in various three-dimensional optical settings.However,incoherent links and knots—knotted or connected lines of coherence singularities—arise from a fundamentally different concept.They are"hidden"in the statistic properties of a randomly fluctuating field,making their presence often elusive or undetectable.Here,we theoretically construct and experimentally demonstrate such topological entities of incoherent light.By leveraging a state-of-the-art incoherent modal-decomposition scheme,we unveil incoherent topological structures from fluctuating light speckles,including Hopf links and Trefoil knots of coherence singularities that are robust against coherence and intensity fluctuations.Our work is applicable to diverse wave systems where incoherence or practical coherence is prevalent,and may pave the way for design and implementation of statistically-shaped topological structures for various applications such as high-dimensional optical information encoding and optical communications.
文摘We are at an inflection point in our control of light,beyond 2D transverse intensity patterns and towards tailored light in space and time,for complete 4D control.When new degrees of freedom are added to the mix,the potential is enormous.It is novel spatiotemporal optical wavepackets that are lighting the way to this exciting future.Controlling light can be traced back thousands of years,with stories of directing sunlight from mirrors to burn attacking ships,an early form of incoherent light shaping[1].In this example,when light is added to light,the outcome is proportionally more light.This paradigm is broken when the light can be treated as coherent waves:light added to light can result in darkness.Thomas Young did exactly this to create spatial intensity structure in the form of“fringes”.Moving beyond just two displaced splits,his notion of fringes can be generalized to any geometry and any degree of freedom[2].His experiment revealed just how easy it is to control the spatial structure of light by simply adding plane waves,initially in the transverse plane for 2D structured light in intensity,but now in more abstract degrees of freedom of light[3].
基金National Natural Science Foundation of China(NSFC)(61905284,62035015,62061136013).
文摘Interplay between dispersion and nonlinearity in optical fibers is a fundamental research topic of nonlinear fiber optics.Here we numerically and experimentally investigate an incoherent continuous-wave(CW)optical field propagating in the fiber with normal dispersion,and introduce a distinctive spectral evolution that differs from the previous reports with coherent mode-locked fiber lasers and partially coherent Raman fiber lasers[Nat.Photonics 9,608(2015).].We further reveal that the underlying physical mechanism is attributed to a novel interplay between groupvelocity dispersion(GVD),self-phase modulation(SPM)and inverse four-wave mixing(IFWM),in which SPM and GVD are responsible for the first spectral broadening,while the following spectral recompression is due to the GVD-assisted IFWM,and the eventual stationary spectrum is owing to the dominant contribution of GVD effect.We believe this work can not only expand the light propagation in the fiber to a more general case and help advance the physical understanding of light propagation with different statistical properties,but also benefit the applications in sensing,telecommunications and fiber lasers.
基金European Commission (PE0000023-NQSTI)Ministero dell'Universitàe della Ricerca (QUEXO2022NZP4T3)Italian Space Agency (Subdiffraction Quantum Imaging SQI 2023-13-HH.0)。
文摘We demonstrate the spectroscopy of incoherent light with subdiffraction resolution.In a proof-of-principle experiment,we analyze the spectrum of a pair of incoherent pointlike sources whose separation is below the diffraction limit.The two sources mimic a planetary system,with a brighter source for the star and a dimmer one for the planet.Acquiring spectral information about the secondary source is difficult because the two images have a substantial overlap.This limitation is solved by leveraging a structured measurement based on spatial-mode demultiplexing,where light is first sorted in its Hermite–Gaussian components in the transverse field then measured by photon detection.This allows us to effectively decouple the photons coming from the two sources.An application is suggested to enhance the exoplanets’atmosphere spectroscopy.A number of experiments of super-resolution imaging based on spatial demultiplexing have been conducted in the past few years,with promising results.Here,for the first time to the best of our knowledge,we extend this concept to the domain of spectroscopy.
