With the purpose of designing the extreme ultraviolet polarizer with many objectives,a combined application of multiobjective genetic algorithms is theoretically proposed.Owing to the multi-objective genetic algorithm...With the purpose of designing the extreme ultraviolet polarizer with many objectives,a combined application of multiobjective genetic algorithms is theoretically proposed.Owing to the multi-objective genetic algorithm,the relationships between different designing objectives of extreme ultraviolet polarizer have been obtained by analyzing the distribution of nondominated solutions in the four-dimensional objective space,and the optimized multilayer design can be obtained by guiding the searching in the desired region based on the multi-objective genetic algorithm with reference direction.Compared with the conventional method of multilayer design,our method has a higher probability of achieving the optimal multilayer design.Our work should be the first research in optimizing the optical multilayer designs in the high-dimensional objective space,and our results demonstrate a potential application of our method in the designs of optical thin films.展开更多
Using temporal and spectral methods,the effects of dispersion and filtering induced by Mo/Si multilayer mirrors reflection on incident attosecond pulses were studied.First,two temporal parameters,the pulse broadening ...Using temporal and spectral methods,the effects of dispersion and filtering induced by Mo/Si multilayer mirrors reflection on incident attosecond pulses were studied.First,two temporal parameters,the pulse broadening factor,and the energy loss factor,were defined to evaluate the effects of dispersion and filtering.Then,by analyzing these temporal parameters,we investigated and compared the dispersion and filtering effects on attosecond pulses.In addition,we explored the origins of pulse broadening and energy loss by analyzing the spectral and temporal characteristics of periodic Mo/Si multilayer mirrors.The results indicate that the filtering effect induced by Mo/Si multilayer mirrors reflection is the dominant reason for pulse broadening and energy loss.展开更多
基金the National Natural Science Foundation of China(Grant Nos.62175018,61905239,and 61974142)Jilin Scientific and Technological Development Plan,China(Grant Nos.20190201013JC and 20200401052GX)。
文摘With the purpose of designing the extreme ultraviolet polarizer with many objectives,a combined application of multiobjective genetic algorithms is theoretically proposed.Owing to the multi-objective genetic algorithm,the relationships between different designing objectives of extreme ultraviolet polarizer have been obtained by analyzing the distribution of nondominated solutions in the four-dimensional objective space,and the optimized multilayer design can be obtained by guiding the searching in the desired region based on the multi-objective genetic algorithm with reference direction.Compared with the conventional method of multilayer design,our method has a higher probability of achieving the optimal multilayer design.Our work should be the first research in optimizing the optical multilayer designs in the high-dimensional objective space,and our results demonstrate a potential application of our method in the designs of optical thin films.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11547183 and 11547241)the Fundamental Research Funds for Central Universities,China(Grant Nos.JD1517 and 2652014012)
文摘Using temporal and spectral methods,the effects of dispersion and filtering induced by Mo/Si multilayer mirrors reflection on incident attosecond pulses were studied.First,two temporal parameters,the pulse broadening factor,and the energy loss factor,were defined to evaluate the effects of dispersion and filtering.Then,by analyzing these temporal parameters,we investigated and compared the dispersion and filtering effects on attosecond pulses.In addition,we explored the origins of pulse broadening and energy loss by analyzing the spectral and temporal characteristics of periodic Mo/Si multilayer mirrors.The results indicate that the filtering effect induced by Mo/Si multilayer mirrors reflection is the dominant reason for pulse broadening and energy loss.
基金Supported by the National Natural Science Foundation of China (No 60378021 and 10435050)the Programfor New Century Excellent Talents in University (No NCET-04-0376)
