By using a loop mirror filter, a novel wavelength-tunable single-frequency ytterbium-doped fiber laser is developed to select single longitudinal modes in a linear cavity. The output wavelength could be tuned 2.4 nm i...By using a loop mirror filter, a novel wavelength-tunable single-frequency ytterbium-doped fiber laser is developed to select single longitudinal modes in a linear cavity. The output wavelength could be tuned 2.4 nm intervals range from 1063.3 to 1065.Tnrn with the temperature change of the fiber Bragg grating. The maximum output power could reach 32 m W while the pump power increases to 120 m W. The corresponding optical-to-optical conversion efficiency is 26.7% and the slope efficiency is 33.9%, respectively. The output power fluctuation is below 2%, and its highest signal-to-noise ratio is 60 dB.展开更多
This study presents a family of novel translational parallel mechanisms(TPMs)with single-loop topological structures.The proposed mechanism consists of only revolute and prismatic joints.The novel TPMs are simpler in ...This study presents a family of novel translational parallel mechanisms(TPMs)with single-loop topological structures.The proposed mechanism consists of only revolute and prismatic joints.The novel TPMs are simpler in structure and have fewer joints and components than the well-known Delta Robot.Four types of 2-degree of freedom driving systems are applied to different limb structures to avoid the moving actuator that causes the problem of increased moving mass.Four sample TPMs are constructed using the synthesized limbs,and one of them is investigated in terms of kinematic performance.First,a position analysis is performed and validated through numerical simulation to reveal the characteristics of partially decoupled motion,which improves the controllability of TPM.Second,singular configurations are identified,and the resulting singularity curve is obtained.Lastly,the workspace of TPM is analyzed,and the relationship between the singular configurations and the reachable workspace is explored.The workspace of the 3-CRR(C denotes the cylindrical joint and R denotes the revolute joint)translational mechanism is also presented to prove that the proposed TPM has a fairly large workspace.展开更多
基金Supported by the International Cooperation Projects of Ministry of Science and Technology under Grant No 2012DFB10120the National Natural Science Foundation of China under Grant No 61177059
文摘By using a loop mirror filter, a novel wavelength-tunable single-frequency ytterbium-doped fiber laser is developed to select single longitudinal modes in a linear cavity. The output wavelength could be tuned 2.4 nm intervals range from 1063.3 to 1065.Tnrn with the temperature change of the fiber Bragg grating. The maximum output power could reach 32 m W while the pump power increases to 120 m W. The corresponding optical-to-optical conversion efficiency is 26.7% and the slope efficiency is 33.9%, respectively. The output power fluctuation is below 2%, and its highest signal-to-noise ratio is 60 dB.
基金This research work was supported by the Fundamental Research Funds for the Central Universities,China(Grant No.2020YJS153)the National Natural Science Foundation of China(Grant No.51975039)Then,the first author would like to acknowledge the China Scholarship Council(Grant No.202007090138)for financial support and the use of the research facilities at Lassonde School of Engineering at York University,Canada.
文摘This study presents a family of novel translational parallel mechanisms(TPMs)with single-loop topological structures.The proposed mechanism consists of only revolute and prismatic joints.The novel TPMs are simpler in structure and have fewer joints and components than the well-known Delta Robot.Four types of 2-degree of freedom driving systems are applied to different limb structures to avoid the moving actuator that causes the problem of increased moving mass.Four sample TPMs are constructed using the synthesized limbs,and one of them is investigated in terms of kinematic performance.First,a position analysis is performed and validated through numerical simulation to reveal the characteristics of partially decoupled motion,which improves the controllability of TPM.Second,singular configurations are identified,and the resulting singularity curve is obtained.Lastly,the workspace of TPM is analyzed,and the relationship between the singular configurations and the reachable workspace is explored.The workspace of the 3-CRR(C denotes the cylindrical joint and R denotes the revolute joint)translational mechanism is also presented to prove that the proposed TPM has a fairly large workspace.
