| Fifth-order attosecond polarization beats using twin color-locked noisy lights in cascade three-level system with Doppler-free approach |
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| 作者姓名： | 宋建平 冯宇 甘琛利 李隆 李院院 余孝军 葛浩 马瑞琼 李创社 张相臣 张彦鹏 卢克清 |
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| 作者单位： | Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，Department of Electronic Science and TechnologyXi'an Jiaotong University，Xi'an 710049，State Key Laboratory of Transient Optics and TechnologyXi'an Institute of Optics and Precision Mechanics，Chinese Academy of Sciences，Xi'an 710068 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China (No. 60308002)
the Foundation of National Excellent Doctoral Dissertation of China (No. 200339). |
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| 摘 要： | Fifth-order attosecond sum-frequency polarization beat (FASPB) is studied in a cascade three level system with the phase-conjugation fourth-order coherence function theory. An improved schematic diagram of geometry, which is different from that inducing fifth-order femtosecond different-frequency polarization beat (FFDPB), is used to obtain FASPB. By analyzing the cases that pump beams have either narrow or broad bandwidth, it is found that the temporal behavior of the sum-frequency polarization beat signal depends on the properties of the lasers and transverse relaxation rate of the atomic energy-level system. Finally, the cascaded four-wave mixing (FWM) processes and the difference between attosecond and femtosecond polarization beats have been discussed, it is found that cascaded or sequential lower processes can often obscure the direct fifth-order polarization beat processes.
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