A cylindrical vector beam is utilized to enhance the energy scale of the pulse post-compressed in a bulk-material Herriott multi-pass cell(MPC).The method proposed here enables,for the first time to the best of our kn...A cylindrical vector beam is utilized to enhance the energy scale of the pulse post-compressed in a bulk-material Herriott multi-pass cell(MPC).The method proposed here enables,for the first time to the best of our knowledge,pulse compression from 14 ps down to 475 fs with throughput energy beyond 1 mJ,corresponding to a compression ratio of 30,which is the highest pulse energy and compression ratio in single-stage bulk-material MPCs.Furthermore,we demonstrate the characteristic of the vector polarization beam is preserved in the MPC.展开更多
Due to the large exciton binding energy,two-dimensional(2D)transition metal dichalcogenides(TMDCs)provide an ideal platform for studying excitonic states and related photonics and optoelectronics.Polarization states l...Due to the large exciton binding energy,two-dimensional(2D)transition metal dichalcogenides(TMDCs)provide an ideal platform for studying excitonic states and related photonics and optoelectronics.Polarization states lead to distinct light-matter interactions which are of great importance for device applications.In this work,we study polarized photoluminescence spectra from intralayer exciton and indirect exciton in WS_(2) and WSe_(2) atomic layers,and interlayer exciton in WS_(2)/WSe_(2) heterostructures by radially and azimuthally polarized cylindrical vector laser beams.We demonstrated the same in-plane and out-of-plane polarization behavior from the intralayer and indirect exciton.Moreover,with these two laser modes,we obtained interlayer exciton in WS_(2)/WSe_(2) heterostructures with stronger out-of-plane polarization,due to the formation of vertical electric dipole moment.展开更多
We reporte and demonstrate a solid-state laser to achieve controlled generation of order-switchable cylindrical vector beams(CVBs).In the cavity,a group of vortex wave plates(VWPs)with two quarter-wave plates between ...We reporte and demonstrate a solid-state laser to achieve controlled generation of order-switchable cylindrical vector beams(CVBs).In the cavity,a group of vortex wave plates(VWPs)with two quarter-wave plates between the VWPs was utilized to achieve mode conversion and order-switch of CVBs.By utilizing two VWPs of first and third orders,the second and fourth order CVBs were obtained,with mode purities of 96.8%and 94.8%,and sloping efficiencies of 4.45%and 3.06%,respectively.Furthermore,by applying three VWPs of first,second,and third orders,the mode-switchable Gaussian beam,second,fourth,and sixth order CVBs were generated.展开更多
The cylindrical vector beam(CVB) has been extensively studied in recent years, but detection of CVBs with on-chip photonic devices is a challenge. Here, we propose and theoretically study a chiral plasmonic lens struc...The cylindrical vector beam(CVB) has been extensively studied in recent years, but detection of CVBs with on-chip photonic devices is a challenge. Here, we propose and theoretically study a chiral plasmonic lens structure for CVB detection. The structure illuminated by a CVB can generate single plasmonic focus, whose focal position depends on the incident angle and the polarization order of CVB. Thus, the incident CVB can be detected according to the focal position and incident angle and with a coupling waveguide to avoid the imaging of the whole plasmonic field. It shows great potential in applications including CVB-multiplexing integrated communication systems.展开更多
A rotating neodymium-doped yttrium aluminum garnet(Nd:YAG)disk laser resonator for efficiently generating vector beams with azimuthal and radial polarization is demonstrated.In the study,the laser crystal rotary for t...A rotating neodymium-doped yttrium aluminum garnet(Nd:YAG)disk laser resonator for efficiently generating vector beams with azimuthal and radial polarization is demonstrated.In the study,the laser crystal rotary for thermal alleviation and polarization discrimination uses c-cut ytterbium vanadate(YVO_(4)).The laser output could be switched between azimuthal and radial polarizations by simply adjusting the cavity length.The laser power reached 4.38 W and 4.64W for azimuthally and radially polarized beams at the slope efficiencies of 45.3%and 48.5%,respectively.Our study proved that an efficient,high-power vector rotary disk laser would be realistic.展开更多
The vector dynamics of solitons are crucial but easily neglected for realizing vortex solitons. In this Letter, we investigate the effect of vector dynamics on cylindrical vector beams(CVBs) implementation and propose...The vector dynamics of solitons are crucial but easily neglected for realizing vortex solitons. In this Letter, we investigate the effect of vector dynamics on cylindrical vector beams(CVBs) implementation and propose a novel technical method to realize femtosecond CVBs based on vector-locked solitons, which are presented as group-velocity-locked vector solitons(GVLVSs) in the experiment. The outstanding vector properties of GVLVSs not only greatly improve the efficiency of solitons converted into CVBs and output power of CVBs(2.4 times and 4.1 times that of scalar solitons and vector change periodical solitons, with the purity of 97.2%), but also relax the obstacle of ultrafast CVBs from the fundamental frequency to the harmonic regime(up to 198 MHz) for the first time, to the best of our knowledge. This is the highest repetition rate reported for ultrafast CVBs based on passive mode-locking. The investigation of the influence of solitons vector dynamics evolution on the realization of CVBs provides guidance for the excellent performance of ultrafast CVBs.展开更多
Femtosecond(fs)cylindrical vector beams(CVBs)have found use in many applications in recent years.However,the existing rigid generation methods seriously limit its development.Here,we propose a flexible method for gene...Femtosecond(fs)cylindrical vector beams(CVBs)have found use in many applications in recent years.However,the existing rigid generation methods seriously limit its development.Here,we propose a flexible method for generating fs-CVBs with arbitrary polarization order by employing half wave plates and vortex retarders.The polarization state,autocorrelation width,pulse width,and spectrum features of the input and generated CVB pulses are measured and compared.The results verify that the generated CVBs remain in the fs regime with no appreciable temporal distortion,and the energy conversion efficiency can reach as high as 96.5%,even for a third-order beam.As a flexible way to generate fs-CVBs,this method will have great significance for many applications.展开更多
Cylindrical vector beams and vortex beams,two types of typical singular optical beams characterized by axially symmetric polarization and helical phase front,possess the unique focusing property and the ability of car...Cylindrical vector beams and vortex beams,two types of typical singular optical beams characterized by axially symmetric polarization and helical phase front,possess the unique focusing property and the ability of carrying orbital angular momentum.We discuss the formation mechanisms of such singular beams in few-mode fibers under the vortex basis and show recent advances in generating techniques that are mainly based on long-period fiber gratings,mode-selective couplers,offset-spliced fibers,and tapered fibers.The performances of cylindrical vector beams and vortex beams generated in fibers and fiber lasers are summarized and compared to give a comprehensive understanding of singular beams and to promote their practical applications.展开更多
In this paper, we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity and constitute an eye-safe single longitudinal mode Er∶Y_(3)Al_(5)O_(12)(Er:YAG) vector laser. A q-plate i...In this paper, we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity and constitute an eye-safe single longitudinal mode Er∶Y_(3)Al_(5)O_(12)(Er:YAG) vector laser. A q-plate is employed as a spin-orbital conversion element to modulate the transverse mode and obtain cylindrical vector beams. An optical isolator is employed as a nonreciprocal element for the ring cavity to enforce unidirectional operation and achieve single longitudinal oscillation. The characteristics of power, transverse intensity, and polarization spectrum of the output beams are observed. The observed typical single longitudinal mode and highly matched special polarizations prove the successful tailoring of both longitudinal and transverse modes.展开更多
文摘A cylindrical vector beam is utilized to enhance the energy scale of the pulse post-compressed in a bulk-material Herriott multi-pass cell(MPC).The method proposed here enables,for the first time to the best of our knowledge,pulse compression from 14 ps down to 475 fs with throughput energy beyond 1 mJ,corresponding to a compression ratio of 30,which is the highest pulse energy and compression ratio in single-stage bulk-material MPCs.Furthermore,we demonstrate the characteristic of the vector polarization beam is preserved in the MPC.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.91850116,51772084,52022029,and U19A2090)Hunan Provincial Natural Science Foundation of China(Grant Nos.2018RS3051 and 2018WK4004)the Key Program of the Hunan Provincial Science and Technology Department,China(Grant No.2019XK2001).
文摘Due to the large exciton binding energy,two-dimensional(2D)transition metal dichalcogenides(TMDCs)provide an ideal platform for studying excitonic states and related photonics and optoelectronics.Polarization states lead to distinct light-matter interactions which are of great importance for device applications.In this work,we study polarized photoluminescence spectra from intralayer exciton and indirect exciton in WS_(2) and WSe_(2) atomic layers,and interlayer exciton in WS_(2)/WSe_(2) heterostructures by radially and azimuthally polarized cylindrical vector laser beams.We demonstrated the same in-plane and out-of-plane polarization behavior from the intralayer and indirect exciton.Moreover,with these two laser modes,we obtained interlayer exciton in WS_(2)/WSe_(2) heterostructures with stronger out-of-plane polarization,due to the formation of vertical electric dipole moment.
基金supported by the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX22_3813)the Jiangsu Province Key Research and Development Program(No.BE2022143)+1 种基金the National Natural Science Foundation of China(No.62205133)the Natural Science Foundation of Jiangsu Province(No.BK20190953).
文摘We reporte and demonstrate a solid-state laser to achieve controlled generation of order-switchable cylindrical vector beams(CVBs).In the cavity,a group of vortex wave plates(VWPs)with two quarter-wave plates between the VWPs was utilized to achieve mode conversion and order-switch of CVBs.By utilizing two VWPs of first and third orders,the second and fourth order CVBs were obtained,with mode purities of 96.8%and 94.8%,and sloping efficiencies of 4.45%and 3.06%,respectively.Furthermore,by applying three VWPs of first,second,and third orders,the mode-switchable Gaussian beam,second,fourth,and sixth order CVBs were generated.
基金This work was partially supported by the Guangdong Major Project of Basic and Applied Basic Research(No.2020B0301030009)National Natural Science Foundation of China(Nos.91750205,62175157,U1701661,61935013,61975128,61805165,and 62105219)+2 种基金Leading Talents of Guangdong Province(No.00201505)Natural Science Foundation of Guangdong Province(No.2019TQ05X750)Shenzhen Science and Technology Program(Nos.JCYJ20180507182035270,JCYJ20210324120403011,and KQTD20170330110444030)。
文摘The cylindrical vector beam(CVB) has been extensively studied in recent years, but detection of CVBs with on-chip photonic devices is a challenge. Here, we propose and theoretically study a chiral plasmonic lens structure for CVB detection. The structure illuminated by a CVB can generate single plasmonic focus, whose focal position depends on the incident angle and the polarization order of CVB. Thus, the incident CVB can be detected according to the focal position and incident angle and with a coupling waveguide to avoid the imaging of the whole plasmonic field. It shows great potential in applications including CVB-multiplexing integrated communication systems.
文摘A rotating neodymium-doped yttrium aluminum garnet(Nd:YAG)disk laser resonator for efficiently generating vector beams with azimuthal and radial polarization is demonstrated.In the study,the laser crystal rotary for thermal alleviation and polarization discrimination uses c-cut ytterbium vanadate(YVO_(4)).The laser output could be switched between azimuthal and radial polarizations by simply adjusting the cavity length.The laser power reached 4.38 W and 4.64W for azimuthally and radially polarized beams at the slope efficiencies of 45.3%and 48.5%,respectively.Our study proved that an efficient,high-power vector rotary disk laser would be realistic.
基金This work was supported by the National Natural Science Foundation of China(NSFC)(Nos.61805023,61804013,and 61804014).
文摘The vector dynamics of solitons are crucial but easily neglected for realizing vortex solitons. In this Letter, we investigate the effect of vector dynamics on cylindrical vector beams(CVBs) implementation and propose a novel technical method to realize femtosecond CVBs based on vector-locked solitons, which are presented as group-velocity-locked vector solitons(GVLVSs) in the experiment. The outstanding vector properties of GVLVSs not only greatly improve the efficiency of solitons converted into CVBs and output power of CVBs(2.4 times and 4.1 times that of scalar solitons and vector change periodical solitons, with the purity of 97.2%), but also relax the obstacle of ultrafast CVBs from the fundamental frequency to the harmonic regime(up to 198 MHz) for the first time, to the best of our knowledge. This is the highest repetition rate reported for ultrafast CVBs based on passive mode-locking. The investigation of the influence of solitons vector dynamics evolution on the realization of CVBs provides guidance for the excellent performance of ultrafast CVBs.
基金supported by the National Natural Science Foundation of China(Nos. 61138003, 61427819, 61422506, 61605117, and 61605142)the Science and Technology Innovation Commission of Shenzhen(Nos. KQCS2015032416183980, KQCS201532416183981, and JCYJ20140418091413543)+5 种基金the start-up funding at Shenzhen Universitysupport given by the Leading Talents of Guangdong Province Program(No. 00201505)the Natural Science Foundation of Guangdong Province(No. 2016A030312010)support of Natural Science Foundation of Guangdong Province(No. 2016A030310063)the Project 2016032 supported by the SZU R/D Fundthe Open Fund of the Key Laboratory of Optical Information Science & Technology(Nankai University)
文摘Femtosecond(fs)cylindrical vector beams(CVBs)have found use in many applications in recent years.However,the existing rigid generation methods seriously limit its development.Here,we propose a flexible method for generating fs-CVBs with arbitrary polarization order by employing half wave plates and vortex retarders.The polarization state,autocorrelation width,pulse width,and spectrum features of the input and generated CVB pulses are measured and compared.The results verify that the generated CVBs remain in the fs regime with no appreciable temporal distortion,and the energy conversion efficiency can reach as high as 96.5%,even for a third-order beam.As a flexible way to generate fs-CVBs,this method will have great significance for many applications.
基金This work was supported by the National Key R&D Program of China(2017YFA0303800)the National Natural Science Foundation of China(11874300,11634010,61575162,61805277,61675169,91950207)+1 种基金the Fundamental Research Funds for the Central Universities(3102017AX009,3102019PY002,3102019JC008)the Natural Science Basic Research Program of Shaanxi(2018JM6013,2019JQ-447).
文摘Cylindrical vector beams and vortex beams,two types of typical singular optical beams characterized by axially symmetric polarization and helical phase front,possess the unique focusing property and the ability of carrying orbital angular momentum.We discuss the formation mechanisms of such singular beams in few-mode fibers under the vortex basis and show recent advances in generating techniques that are mainly based on long-period fiber gratings,mode-selective couplers,offset-spliced fibers,and tapered fibers.The performances of cylindrical vector beams and vortex beams generated in fibers and fiber lasers are summarized and compared to give a comprehensive understanding of singular beams and to promote their practical applications.
基金This work was supported by the National Key Research and Development Program of China(No.2017YFB0405203)National Natural Science Foundation of China(Nos.11834001 and 61905012)National Defense Basic Scientific Research Program of China(No.JCKY2020602C007)。
文摘In this paper, we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity and constitute an eye-safe single longitudinal mode Er∶Y_(3)Al_(5)O_(12)(Er:YAG) vector laser. A q-plate is employed as a spin-orbital conversion element to modulate the transverse mode and obtain cylindrical vector beams. An optical isolator is employed as a nonreciprocal element for the ring cavity to enforce unidirectional operation and achieve single longitudinal oscillation. The characteristics of power, transverse intensity, and polarization spectrum of the output beams are observed. The observed typical single longitudinal mode and highly matched special polarizations prove the successful tailoring of both longitudinal and transverse modes.