High-intensity vortex beams with tunable topological charges and low coherence are highly demanded in applications such as inertial confinement fusion(ICF) and optical communication. However, traditional optical vorti...High-intensity vortex beams with tunable topological charges and low coherence are highly demanded in applications such as inertial confinement fusion(ICF) and optical communication. However, traditional optical vortices featuring nonuniform intensity distributions are dramatically restricted in application scenarios that require a high-intensity vortex beam owing to their ineffective amplification resulting from the intensity-dependent nonlinear effect. Here, a low-coherence perfect vortex beam(PVB) with a topological charge as high as 140 is realized based on the super-pixel wavefront-shaping technique. More importantly, a globally adaptive feedback algorithm(GAFA) is proposed to efficiently suppress the original intensity fluctuation and achieve a flat-top PVB with dramatically reduced beam speckle contrast. The GAFA-based flat-top PVB generation method can pave the way for high-intensity vortex beam generation,which is crucial for potential applications in ICF, laser processing, optical communication and optical trapping.展开更多
Spin glass theory,as a paradigm for describing disordered magnetic systems,constitutes a prominent subject of study within statistical physics.Replica symmetry breaking(RSB),as one of the pivotal concepts for the unde...Spin glass theory,as a paradigm for describing disordered magnetic systems,constitutes a prominent subject of study within statistical physics.Replica symmetry breaking(RSB),as one of the pivotal concepts for the understanding of spin glass theory,means that under identical conditions,disordered systems can yield distinct states with nontrivial correlations.Random fiber laser(RFL)based on Rayleigh scattering(RS)is a complex disordered system,owing to the disorder and stochasticity of RS.In this work,for the first time,a precise theoretical model is elaborated for studying the photonic phase transition via the platform of RS-based RFL,in which we clearly reveal that,apart from the pump power,the photon phase variation in RFL is also an analogy to the temperature term in spin-glass phase transition,leading to a novel insight into the intrinsic mechanisms of photonic phase transition.In addition,based on this model and real-time high-fidelity detection spectral evolution,we theoretically predict and experimentally observe the mode-asymmetric characteristics of photonic phase transition in RS-based RFL.This finding contributes to a deeper understanding of the photonic RSB regime and the dynamics of RS-based RFL.展开更多
基金supported by the Guangdong Basic and Applied Basic Research Foundation(Grant No.2020A1515111143)the Natural Science Foundation of Guangdong Province(Grant Nos.2021A1515011532 and 2023ZDZX3022)Shenzhen Government’s Plan of Science and Technology(Grant Nos.JCYJ20220818100019040,RCYX20210609103157071,and JCYJ20230808105713028)。
文摘High-intensity vortex beams with tunable topological charges and low coherence are highly demanded in applications such as inertial confinement fusion(ICF) and optical communication. However, traditional optical vortices featuring nonuniform intensity distributions are dramatically restricted in application scenarios that require a high-intensity vortex beam owing to their ineffective amplification resulting from the intensity-dependent nonlinear effect. Here, a low-coherence perfect vortex beam(PVB) with a topological charge as high as 140 is realized based on the super-pixel wavefront-shaping technique. More importantly, a globally adaptive feedback algorithm(GAFA) is proposed to efficiently suppress the original intensity fluctuation and achieve a flat-top PVB with dramatically reduced beam speckle contrast. The GAFA-based flat-top PVB generation method can pave the way for high-intensity vortex beam generation,which is crucial for potential applications in ICF, laser processing, optical communication and optical trapping.
基金supported by the Natural Science Foundation of China(62075030)the Ministry of Science and Technology of China(DL2023167001L)the Sichuan Science and Technology Program under 2023YFSY0058,111 Project(B14039).
文摘Spin glass theory,as a paradigm for describing disordered magnetic systems,constitutes a prominent subject of study within statistical physics.Replica symmetry breaking(RSB),as one of the pivotal concepts for the understanding of spin glass theory,means that under identical conditions,disordered systems can yield distinct states with nontrivial correlations.Random fiber laser(RFL)based on Rayleigh scattering(RS)is a complex disordered system,owing to the disorder and stochasticity of RS.In this work,for the first time,a precise theoretical model is elaborated for studying the photonic phase transition via the platform of RS-based RFL,in which we clearly reveal that,apart from the pump power,the photon phase variation in RFL is also an analogy to the temperature term in spin-glass phase transition,leading to a novel insight into the intrinsic mechanisms of photonic phase transition.In addition,based on this model and real-time high-fidelity detection spectral evolution,we theoretically predict and experimentally observe the mode-asymmetric characteristics of photonic phase transition in RS-based RFL.This finding contributes to a deeper understanding of the photonic RSB regime and the dynamics of RS-based RFL.
