Conventional methods for near-field characterization have typically relied on the nanoprobe to point-scan the field,rendering the measurements vulnerable to external environmental influences.Here,we study the direct f...Conventional methods for near-field characterization have typically relied on the nanoprobe to point-scan the field,rendering the measurements vulnerable to external environmental influences.Here,we study the direct far-field imaging of the near-field polarizations based on the four-wave mixing effect.We construct a simulation model to realize the instantaneous extraction of the near-field distributions of a wide range of structured light fields,such as cylindrical vector vortex beams,plasmonic Weber beams,and topological spin textures,including photonic skyrmions and merons.This method is valuable for the studies on manipulation of structured light fields and light-matter interaction at the micro/nano scales.展开更多
This paper presents an investigation of the secondary saturation characteristics of a HfTe_(2)saturable absorber.Pulse energies of 5.85 and 7.4 mJ were demonstrated with a high-order Hermite-Gaussian(HG)laser and a vo...This paper presents an investigation of the secondary saturation characteristics of a HfTe_(2)saturable absorber.Pulse energies of 5.85 and 7.4 mJ were demonstrated with a high-order Hermite-Gaussian(HG)laser and a vortex laser,respectively,using alexandrite as the gain medium.To the best of our knowledge,these are the highest pulse energies directly generated with HG and vortex lasers.To broaden the applications of high-energy pulsed HG and vortex lasers,wavelength tuning in the region of 40 nm was achieved using an etalon.pulse energy of 5.85 mJ and a vortex laser with a single pulse energy of 7.4 mJ were obtained in alexandrite.The repetition rates of these lasers were 262 and 196 Hz,respectively.To expand the applications of high-energy structured lasers,wavelength tuning within the range of 747-787 nm was successfully accomplished using an etalon.展开更多
Dynamic beam shaping is of importance for a wide range of applications, such as light field regulation, laser processing, and advanced manufacturing. In this paper, an internal phase-sensing tiled-aperture coherent be...Dynamic beam shaping is of importance for a wide range of applications, such as light field regulation, laser processing, and advanced manufacturing. In this paper, an internal phase-sensing tiled-aperture coherent beam-combining system with seven beam elements was constructed for dynamic beam shaping. This system could be performed as a digital laser,where each laser beamlet functioned as an individual laser pixel. The amplitude and phase of each laser pixel could be adjusted independently in real time. In our experiment, the laser array was operated in three different configurations:the triangular, pentagonal, and hexagonal laser arrays, while each laser pixel was modulated with a different piston phase of nπ(where n was an integer). We demonstrated various beam-shaping patterns based on this system with output powers scaling over 1 kW. Additionally, the energy distribution of the emitted laser could be flexibly varied and customized.These results highlighted that our dynamic beam-shaped laser exhibited excellent performance in both dynamic beam-shaping and power-scaling capabilities. This work holds great potential for numerous applications involving beam shaping.展开更多
基金supported by the Guangdong Major Project of Basic Research(No.2020B0301030009)the National Natural Science Foundation of China(Nos.62075139,61935013,and 12004260)+4 种基金the Natural Science Foundation of Guangdong(No.2024A1515012503)the Innovation Team Project of Ordinary University of Guangdong Provincial Education Bureau(No.2024KCXTD014)the Shenzhen Science and Technology Program(Nos.RCJC20200714114435063 and JCYJ20241202124532024)the Research Team Cultivation Program of Shenzhen University(No.2023QNT012)the Shenzhen University 2035 Initiative(No.2023B004)。
文摘Conventional methods for near-field characterization have typically relied on the nanoprobe to point-scan the field,rendering the measurements vulnerable to external environmental influences.Here,we study the direct far-field imaging of the near-field polarizations based on the four-wave mixing effect.We construct a simulation model to realize the instantaneous extraction of the near-field distributions of a wide range of structured light fields,such as cylindrical vector vortex beams,plasmonic Weber beams,and topological spin textures,including photonic skyrmions and merons.This method is valuable for the studies on manipulation of structured light fields and light-matter interaction at the micro/nano scales.
基金supported by the National Natural Science Foundation of China(Grant Nos.12204499 and 12174212)the Joint Key Projects of National Natural Science Foundation of China(Grant No.U2032206)。
文摘This paper presents an investigation of the secondary saturation characteristics of a HfTe_(2)saturable absorber.Pulse energies of 5.85 and 7.4 mJ were demonstrated with a high-order Hermite-Gaussian(HG)laser and a vortex laser,respectively,using alexandrite as the gain medium.To the best of our knowledge,these are the highest pulse energies directly generated with HG and vortex lasers.To broaden the applications of high-energy pulsed HG and vortex lasers,wavelength tuning in the region of 40 nm was achieved using an etalon.pulse energy of 5.85 mJ and a vortex laser with a single pulse energy of 7.4 mJ were obtained in alexandrite.The repetition rates of these lasers were 262 and 196 Hz,respectively.To expand the applications of high-energy structured lasers,wavelength tuning within the range of 747-787 nm was successfully accomplished using an etalon.
基金supported by the National Natural Science Foundation of China (No.62275272)the Training Program for Excellent Young Innovators of Changsha(No.kq2205025)。
文摘Dynamic beam shaping is of importance for a wide range of applications, such as light field regulation, laser processing, and advanced manufacturing. In this paper, an internal phase-sensing tiled-aperture coherent beam-combining system with seven beam elements was constructed for dynamic beam shaping. This system could be performed as a digital laser,where each laser beamlet functioned as an individual laser pixel. The amplitude and phase of each laser pixel could be adjusted independently in real time. In our experiment, the laser array was operated in three different configurations:the triangular, pentagonal, and hexagonal laser arrays, while each laser pixel was modulated with a different piston phase of nπ(where n was an integer). We demonstrated various beam-shaping patterns based on this system with output powers scaling over 1 kW. Additionally, the energy distribution of the emitted laser could be flexibly varied and customized.These results highlighted that our dynamic beam-shaped laser exhibited excellent performance in both dynamic beam-shaping and power-scaling capabilities. This work holds great potential for numerous applications involving beam shaping.
