An optical phased array(OPA)featuring all-solid-state beam steering is a promising component for light detection and ranging(LiDAR).There exists an increasing demand for panoramic perception and rapid target recogniti...An optical phased array(OPA)featuring all-solid-state beam steering is a promising component for light detection and ranging(LiDAR).There exists an increasing demand for panoramic perception and rapid target recognition in intricate LiDAR applications,such as security systems and self-driving vehicles.However,the majority of existing OPA approaches suffer from limitations in field of view(FOV)and do not explore parallel scanning,thus restricting their potential utility.Here,we combine a two-dimensional(2D)grating with an FOV-synthetization concept to design a silicon-based top-facing OPA for realizing a wide cone-shaped 360°FOV.By utilizing four OPA units sharing the 2D grating as a single emitter,four laser beams are simultaneously emitted upwards and manipulated to scan distinct regions,demonstrating seamless beam steering within the lateral 360°range.Furthermore,a frequency-modulated dissipative Kerr-soliton(DKS)microcomb is applied to the proposed multi-beam OPA,exhibiting its capability in large-scale parallel multi-target coherent detection.The comb lines are spatially dispersed with a 2D grating and separately measure distances and velocities in parallel,significantly enhancing the parallelism.The results showcase a ranging precision of 1 cm and velocimetry errors of less than 0.5 cm/s.This approach provides an alternative solution for LiDAR with an ultra-wide FOV and massively parallel multi-target detection capability.展开更多
With the aid of the latest fiber optic sensing technology parameters in the cure process of ther- mosetting resin-matrix composite, such as temperature, viscosity,void and residual stress, can be monitored entirely an...With the aid of the latest fiber optic sensing technology parameters in the cure process of ther- mosetting resin-matrix composite, such as temperature, viscosity,void and residual stress, can be monitored entirely and efficiently.In this paper, experiment results of viscosity measurement in composite cure process in autoclave using fiber optic sensors are presented. Based on the sensed information, a computer program is utilized to control the cure process. With this technology, the cure process becomes more apparent and controllable, which will greatly improve the cured products and reduce the cost.展开更多
This feature issue is the second Joint Applied Optics （AO） and Chinese Optics Letters （COL） Feature Issue on digital holography and three-dimensional （3D） imaging. The first installment of such a joint feature i...This feature issue is the second Joint Applied Optics （AO） and Chinese Optics Letters （COL） Feature Issue on digital holography and three-dimensional （3D） imaging. The first installment of such a joint feature issue was in 2011. In the present feature issue, there are a total of 24 papers in AO and 9 papers in COL.展开更多
基金National Key Research and Development Program of China(2022YFA1404001)National Natural Science Foundation of China(62135004)Key Research and Development Program of Hubei Province(2021BAA005)。
文摘An optical phased array(OPA)featuring all-solid-state beam steering is a promising component for light detection and ranging(LiDAR).There exists an increasing demand for panoramic perception and rapid target recognition in intricate LiDAR applications,such as security systems and self-driving vehicles.However,the majority of existing OPA approaches suffer from limitations in field of view(FOV)and do not explore parallel scanning,thus restricting their potential utility.Here,we combine a two-dimensional(2D)grating with an FOV-synthetization concept to design a silicon-based top-facing OPA for realizing a wide cone-shaped 360°FOV.By utilizing four OPA units sharing the 2D grating as a single emitter,four laser beams are simultaneously emitted upwards and manipulated to scan distinct regions,demonstrating seamless beam steering within the lateral 360°range.Furthermore,a frequency-modulated dissipative Kerr-soliton(DKS)microcomb is applied to the proposed multi-beam OPA,exhibiting its capability in large-scale parallel multi-target coherent detection.The comb lines are spatially dispersed with a 2D grating and separately measure distances and velocities in parallel,significantly enhancing the parallelism.The results showcase a ranging precision of 1 cm and velocimetry errors of less than 0.5 cm/s.This approach provides an alternative solution for LiDAR with an ultra-wide FOV and massively parallel multi-target detection capability.
文摘With the aid of the latest fiber optic sensing technology parameters in the cure process of ther- mosetting resin-matrix composite, such as temperature, viscosity,void and residual stress, can be monitored entirely and efficiently.In this paper, experiment results of viscosity measurement in composite cure process in autoclave using fiber optic sensors are presented. Based on the sensed information, a computer program is utilized to control the cure process. With this technology, the cure process becomes more apparent and controllable, which will greatly improve the cured products and reduce the cost.
文摘This feature issue is the second Joint Applied Optics （AO） and Chinese Optics Letters （COL） Feature Issue on digital holography and three-dimensional （3D） imaging. The first installment of such a joint feature issue was in 2011. In the present feature issue, there are a total of 24 papers in AO and 9 papers in COL.
