A linear quadric (LQ) optimal speed control algorithm is proposed for the speed control of a pump controlled motor hydraulic system. The control theme consists of optimal state feedback and disturbing compensation bas...A linear quadric (LQ) optimal speed control algorithm is proposed for the speed control of a pump controlled motor hydraulic system. The control theme consists of optimal state feedback and disturbing compensation based on observation. The optimal state feedback bases on LQ cost function. The disturbing compensation is realized through reconstructing the state of load torque. A series of simulation are performed, and the results show that the control performance is satisfactory and can be maintained under changes of load torque.展开更多
By optimizing pump power ratio between 1st order backward pump and 2nd order forward pump on discrete Raman amplifier, we demonstrated over 2dB noise figure improvement without excessive non-linearity degradation.
The laser performance of a new Yb：germanophosphate（Yb：GP） glass is investigated. A maximum output power of 826 m W at 1063 nm is achieved with direct diode pumping at 976 nm. The wavelength is tuned from 1034.47 t...The laser performance of a new Yb：germanophosphate（Yb：GP） glass is investigated. A maximum output power of 826 m W at 1063 nm is achieved with direct diode pumping at 976 nm. The wavelength is tuned from 1034.47 to 1070.83 nm, corresponding to a tuning range of 36.36 nm. Thermal lens effects are investigated to optimize the optical cavity.展开更多
Far-field blooming, a serious far-field dependence on driving current, affects the stability of beam quality and applications of broad-area（BA） diode lasers. In this Letter, the lateral ridge waveguide（LRW） is int...Far-field blooming, a serious far-field dependence on driving current, affects the stability of beam quality and applications of broad-area（BA） diode lasers. In this Letter, the lateral ridge waveguide（LRW） is introduced to BA lasers by a simple and cost-effective approach to control the far-field stability and beam divergence. The influences of LRW length on output power, near-and far-field, are investigated and it is found that the optimized LRW length is able to improve both the far-field blooming and output power. The mechanism behind this is analyzed and a 0.13°/A dependence of lateral divergence angle on the injection current is achieved.展开更多
文摘A linear quadric (LQ) optimal speed control algorithm is proposed for the speed control of a pump controlled motor hydraulic system. The control theme consists of optimal state feedback and disturbing compensation based on observation. The optimal state feedback bases on LQ cost function. The disturbing compensation is realized through reconstructing the state of load torque. A series of simulation are performed, and the results show that the control performance is satisfactory and can be maintained under changes of load torque.
文摘By optimizing pump power ratio between 1st order backward pump and 2nd order forward pump on discrete Raman amplifier, we demonstrated over 2dB noise figure improvement without excessive non-linearity degradation.
基金supported by the National Science Foundation of China(NSFC)under Grant Nos.11504394,61521093,and 61378030
文摘The laser performance of a new Yb：germanophosphate（Yb：GP） glass is investigated. A maximum output power of 826 m W at 1063 nm is achieved with direct diode pumping at 976 nm. The wavelength is tuned from 1034.47 to 1070.83 nm, corresponding to a tuning range of 36.36 nm. Thermal lens effects are investigated to optimize the optical cavity.
基金supported by the National Natural Science Foundation of China(Nos.61404138 and 61474119)the National Basic Research Program of China(No.2013CB933303)+1 种基金the International Science Technology Cooperation Program of China(No.2013DFR00730)the Opened Fund of the State Key Laboratory on Integrated Optoelectronics(No.IOSKL2016KF15)
文摘Far-field blooming, a serious far-field dependence on driving current, affects the stability of beam quality and applications of broad-area（BA） diode lasers. In this Letter, the lateral ridge waveguide（LRW） is introduced to BA lasers by a simple and cost-effective approach to control the far-field stability and beam divergence. The influences of LRW length on output power, near-and far-field, are investigated and it is found that the optimized LRW length is able to improve both the far-field blooming and output power. The mechanism behind this is analyzed and a 0.13°/A dependence of lateral divergence angle on the injection current is achieved.
