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The study of numerical character for femtosecond pulse shaping

Chinese Physics B 2007年第11期16卷 3429-3433页

作者：邹华朱卫华王国栋 College of Science Hohai UniversityNanjing210098China

This paper describes the generation of shaped femtosecond multiple pulses by using the phase-only Dammann filters in 4f femtosecond shaper and gives the experimental result of femtosecond pulse characterization by the frequency- resolved optical gating （FROG） technique. With the theoretical simulation, it concludes that the quality of the generated output array is relevant to the number of pixels and the spacing between the components.

关键词： space-time conversion femtosecond pulse shaping Dammann frequency-resolved optical gating

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Simulating the resonance-mediated(1+2)-three-photon absorption enhancement in Pr3+ions by a rectangle phase modulation

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Chinese Physics B 2022年第6期31卷 285-290页

作者： Wenjing Cheng Yuan Li Hongzhen Qiao Meng Wang Shaoshuo Ma Fangjie Shu Chuanqi Xie and Guo Liang Henan Province Engineering Research Center of Microcavity and Photoelectric Intelligent Sensing School of Electronics and Electrical EngineeringShangqiu Normal UniversityShangqiu 476000China Department of Ophthalmology First People’s Hospital of ShangqiuShangqiu 476000China The Key Laboratory of Weak Light Nonlinear Photonics Nankai University of Ministry of Education Tianjin 300457China

Enhancing the upconversion luminescence of rare earth ions is crucial for their applications in the laser sources,fiber optic communications,color displays,biolabeling,and biomedical *** this paper,we theoretically study the resonance-mediated(1+2)-three-photon absorption in Pr^(3+) ions by a rectangle phase *** results show that the resonance-mediated(1+2)-three-photon absorption can be effectively enhanced by properly designing the depth and width of the rectangle phase modulation,which can be attributed to the constructive interference between on-resonant and near-resonant three-photon excitation ***,the enhancement efficiency of resonance-mediated(1+2)-threephoton absorption can be affected by the pulse width(or spectral bandwidth)of femtosecond laser field,final state transition frequency,and absorption *** research can provide a clear physical picture for understanding and controlling the multi-photon absorption in rare-earth ions,and also can provide theoretical guidance for improving the up-conversion luminescence.

关键词： coherent quantum control femtosecond pulse shaping three-photon absorption rare-earth ions

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Simulating resonance-mediated two-photon absorption enhancement in rare-earth ions by a rectangle phase modulation

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Chinese Physics B 2018年第1期27卷 329-334页

作者：齐大龙郑烨程文静姚云华邓联忠冯东海贾天卿孙真荣张诗按 State Key Laboratory of Precision Spectroscopy East China Normal University School of Electronic & Electrical Engineering Shangqiu Normal University Collaborative Innovation Center of Extreme Optics Shanxi University

Improving the up-conversion luminescence efficiency crucial in several related application areas. In this work, of rare-earth ions via the multi-photon absorption process is we theoretically propose a feasible scheme to enhance the resonance-mediated two-photon absorption in Er3＋ ions by shaping the femtosecond laser field with a rectangle phase modulation. Our theoretical results show that the resonance-mediated two-photon absorption can be decomposed into the on-resonant and near-resonant parts, and the on-resonant part mainly comes from the contribution of laser central frequency components, while the near-resonant part mainly results from the excitation of low and high laser frequency components. So, the rectangle phase modulation can induce a constructive interference between the two parts by properly designing the modulation depth and width, and finally realizes the resonance-mediated two-photon absorption enhancement. More- over, our results also show that the enhancement efficiency of resonance-mediated two-photon absorption depends on the laser pulse width （or laser spectral bandwidth）, final state transition frequency, and intermediate and final state absorption bandwidths. The enhancement efficiency modulation can be attributed to the relative weight manipulation of on-resonant and near-resonant two-photon absorption in the whole excitation process. This study presents a clear physical insight for the quantum control of resonance-mediated two-photon absorption in the rare-earth ions, and there will be an important significance for improving the up-conversion luminescence efficiency of rare-earth ions.

关键词： coherent quantum control femtosecond pulse shaping two-photon absorption rare-earth ions

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femtosecond laser-induced periodic structures:mechanisms, techniques, and applications

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Opto-Electronic Science 2022年第6期1卷 11-31页

作者： Yuchan Zhang Qilin Jiang Mingquan Long Ruozhong Han Kaiqiang Cao Shian Zhang Donghai Feng Tianqing Jia Zhenrong Sun Jianrong Qiu Hongxing Xu State Key Laboratory of Precision Spectroscopy School of Physics and Materials ScienceEast China Normal UniversityShanghai 200062China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China State Key Laboratory of Optical Instrumentation Zhejiang UniversityHangzhou 310027China

Over the past two decades,femtosecond laser-induced periodic structures(femtosecond-LIPSs)have become ubiquitous in a variety of materials,including metals,semiconductors,dielectrics,and ***-LIPSs have become a useful laser processing method,with broad prospects in adjusting material properties such as structural color,data storage,light absorption,and *** review discusses the formation mechanism of LIPSs,specifically the LIPS formation processes based on the pump-probe imaging *** pulse shaping of a femtosecond laser in terms of the time/frequency,polarization,and spatial distribution is an efficient method for fabricating high-quality *** LIPS applications are also briefly *** last part of this paper discusses the LIPS formation mechanism,as well as the high-efficiency and high-quality processing of LIPSs using shaped ultrafast lasers and their applications.

关键词： laser-induced periodic structures(LIPSs) formation mechanisms femtosecond pulse shaping pump-probe imaging structural color birefringent effects optical absorption photoluminescence

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