| 1 | An efficient high-power femtosecond laser based on periodic-layered-Kerr media nonlinear compression and a Yb:YAG regenerative amplifier显示文摘We demonstrate an efficient ultrafast source with 195 fs pulse duration,54 W average power at 200 kHz repetition rate and near diffraction-limited beam quality.The compact setup incorporates a thin-disk Yb:YAG regenerative amplifier(RA)and a subsequent nonlinear pulse compression stage with periodic-layered Kerr media(PLKM),which is one of the multiple-thin-solid-plate schemes based on nonlinear resonator theory.In virtue of the formation of quasi-stationary spatial soliton in PLKM,the near diffraction-limited beam quality of the RA remained almost undisturbed after post-compression.The nonlinear pulse compression module is simple and efficient with a transmission of 96%.To the best our knowledge,for pulse energy over 200μJ,this is the highest output power reported for the multiple-thin-solid-plate scheme.This source manifests an economical combination to mitigate the bandwidth limitations of Yb-based high-power chirped pulse amplifiers. | Jie Guo Zichen Gao Di Sun Xiao Du Yongxi Gao Xiaoyan Liang | 2022 | High Power Laser Science and Engineering2022，10，2： | 1 |
| 2 | Techno-economic assessment of a chemical looping splitting system for H2 and CO Co-generation显示文摘The natural gas(NG)reforming is currently one of the low-cost methods for hydrogen production.However,the mixture of H2 and CO_(2) in the produced gas inevitably includes CO_(2) and necessitates the costly CO_(2) separation.In this work,a novel double chemical looping involving both combustion(CLC)and sorption-enhanced reforming(SE-CLR)was proposed towards the co-production of H2 and CO(CLC-SECLRHC)in two separated streams.CLC provides reactant CO_(2) and energy to feed SECLRHC,which generates hydrogen in a higher purity,as well as the calcium cycle to generate CO in a higher purity.Techno-economic assessment of the proposed system was conducted to evaluate its efficiency and economic competitiveness.Studies revealed that the optimal molar ratios of oxygen carrier(OC)/NG and steam/NG for reforming were recommended to be 1.7 and 1.0,respectively.The heat integration within CLC and SECLRHC units can be achieved by circulating hot OCs.The desired temperatures of fuel reactor(FR)and reforming reactor(RR)should be 850C and 600C,respectively.The heat coupling between CLC and SECLRHC units can be realized via a jacket-type reactor,and the NG split ratio for reforming and combustion was 0.53:0.47.Under the optimal conditions,the H2 purity,the H2 yield and the CH4 conversion efficiency were 98.76%,2.31 mol mol-1 and 97.96%,respectively.The carbon and hydrogen utilization efficiency respectively were 58.60% and 72.45%in terms of the total hydrogen in both steam and NG.The exergy efficiency of the overall process reached 70.28%.In terms of the conventional plant capacity(75 × 103 t y^(-1))and current raw materials price(2500$t^(-1)),the payback period can be 6.2 years and the IRR would be 11.5,demonstrating an economically feasible and risk resistant capability. | Hao Peng Zichen Di Pan Gong Fengling Yang Fangqin Cheng | 2023 | Green Energy & Environment2023，8，1： | 0 |
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