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| 1 | Generation of coexisting high-energy pulses in a mode-locked all-fiber laser with a nonlinear multimodal interference technique显示文摘We demonstrate a passively mode-locked all-fiber laser incorporating a piece of graded-index multimode fiber as a mode-locking modulator based on a nonlinear multimodal interference technique, which generates two types of coexisting high-energy ultrashort pulses [i.e., the conventional soliton(CS) and the stretched pulse(SP)]. The CS with pulse energy as high as 0.38 n J is obtained at the pump level of 130 mW. When the pump increases to175 mW, the high-energy SP occurs at a suitable nonlinear phase bias and its pulse energy can reach 4 n J at a 610 mW pump. The pulse durations of the generated CS and SP are 2.3 ps and 387 fs, respectively. The theory of nonlinear fiber optics, single-shot spectral measurement by the dispersive Fourier-transform technique, and simulation methods based on the Ginzburg–Landau equation are provided to characterize the laser physics and reveal the underlying principles of the generated CS and SP. A rogue wave, observed between the CS and SP regions, mirrors the laser physics behind the dynamics of generating a high-energy SP from a CS. The proposed all-fiber laser is versatile, cost-effective and easy to integrate, which provides a promising solution for high-energy pulse generation. | GUANGWEI CHEN WENLEI LI GUOMEI WANG WENFU ZHANG CHAO ZENG WEI ZHAO | 2019 | Photonics Research2019，7，2： | 9 |
| 2 | Generation of 131 fs mode-locked pulses from 2.8μm Er:ZBLAN fiber laser显示文摘We demonstrated a femtosecond mode-locked Er:Zr F4-Ba F2-La F3-Al F3-Na F(Er:ZBLAN)fiber laser at 2.8μm based on the nonlinear polarization rotation technique.The laser generated an average output power of 317 m W with a repetition rate of 107 MHz and pulse duration as short as 131 fs.To the best of our knowledge,this is the shortest pulse generated directly from a mid-infrared mode-locked Er:ZBLAN fiber laser to date.Numerical simulation and experimental results confirm that reducing the gain fiber length is an effective way to shorten the mode-locked pulse duration in the Er:ZBLAN fiber laser.The work takes an important step towards sub-100-fs mid-infrared pulse generation from mode-locked Er:ZBLAN fiber lasers. | 顾宏安 覃治鹏 谢国强 海婷 袁鹏 马金贵 钱列加 | 2020 | Chinese Optics Letters2020，18，3： | 8 |
| 3 | Estimation of Gaussian overlapping nuclear pulse parameters based on a deep learning LSTM model显示文摘A long short-term memory(LSTM)neural network has excellent learning ability applicable to time series of nuclear pulse signals.It can accurately estimate parameters associated with amplitude,time,and so on,in digitally shaped nuclear pulse signals—especially signals from overlapping pulses.By learning the mapping relationship between Gaussian overlapping pulses after digital shaping and exponential pulses before shaping,the shaping parameters of the overlapping exponential nuclear pulses can be estimated using the LSTM model.Firstly,the Gaussian overlapping nuclear pulse(ONP)parameters which need to be estimated received Gaussian digital shaping treatment,after superposition by multiple exponential nuclear pulses.Secondly,a dataset containing multiple samples was produced,each containing a sequence of sample values from Gaussian ONP,after digital shaping,and a set of shaping parameters from exponential pulses before digital shaping.Thirdly,the Training Set in the dataset was used to train the LSTM model.From these datasets,the values sampled from the Gaussian ONP were used as the input data for the LSTM model,and the pulse parameters estimated by the current LSTM model were calculated by forward propagation.Next,the loss function was used to calculate the loss value between the network-estimated pulse parameters and the actual pulse parameters.Then,a gradient-based optimization algorithm was applied,to feedback the loss value and the gradient of the loss function to the neural network,to update the weight of the LSTM model,thereby achieving the purpose of training the network.Finally,the sampled value of the Gaussian ONP for which the shaping parameters needed to be estimated was used as the input data for the LSTM model.After this,the LSTM model produced the required nuclear pulse parameter set.In summary,experimental results showed that the proposed method overcame the defect of local convergence encountered in traditional methods and could accurately extract parameters from multiple,severely overlapping Gaussian pulses,to achieve optimal estimation of nuclear pulse parameters in the global sense.These results support the conclusion that this is a good method for estimating nuclear pulse parameters. | Xing-Ke Ma Hong-Quan Huang Qian-Cheng Wang Jing Zhao Fei Yang Kai-Ming Jiang Wei-Cheng Ding Wei Zhou | 2019 | Nuclear Science and Techniques2019，30，11： | 6 |
| 4 | Sub-10-fs pulse generation directly from a KLM Ti: sapphire laser显示文摘By reducing the effects of frequency dependent mode size and intracavity gain saturation of a KLM Ti: sapphire laser, the pulse bandwidth broadening is enhanced significantly. 8.5 fs pulses with the bandwidth of 92 nm at wavelength of 710 nm have been generated directly from this laser and measured with an extracavity group velocity dispersion compensation system. | Weizhu Lin Rui Liao Jinhui Wen Zhigang Liu Li Deng Haichao Zhang Tianshu Lai | 2002 | Chinese Science Bulletin2002，47，12： | 5 |
| 5 | Generation of surface electrons in femtosecond laser-solid interactions显示文摘The characteristics of hot electrons produced by p-polarized femtosecond laser-solid interactions are studied. The experimental results show that the outgoing electrons are mainly emitted in three directions: along the target surface, the normal direction and the laser backward direction. The electrons flowing along the target surface are due to the confinement of the electrostatic field and the surface magnetic field, while the electrons in the normal direction due to the resonant absorption. | XU Miaohua1, LI Yutong1, YUAN Xiaohui1,2, ZHENG Zhiyuan1, LIANG Wenxi1, YU Quanzhi1, ZHANG Yi1, WANG Zhaohua1, WEI Zhiyi1 & ZHANG Jie1 1. Key Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China 2. State Key Laboratory of Transient Optics Technology, Chinese Academy of Sciences, Xi’an 710068, China | 2006 | Science China(Physics,Mechanics & Astronomy)2006，49，3： | 5 |
| 6 | Generating femtosecond coherent X-ray pulses in a diffractionlimited storage ring with the echo-enabled harmonic generation scheme显示文摘To study ultrafast processes at the sub-picosecond level, novel methods based on coherent harmonic generation technologies have been proposed to generate ultrashort radiation pulses in existing ring-based light sources. Using the High Energy Photon Source as an example, we numerically test the feasibility of implementing one coherent harmonic generation technology, i.e.,the echo-enabled harmonic generation(EEHG) scheme, in a diffraction-limited storage ring(DLSR). Two different EEHG element layouts are considered, and the effect of the EEHG process on the electron beam quality is also analyzed. Studies suggest that soft X-ray pulses, with pulse lengths of a few femtoseconds and peak powers of up to1 MW, can be generated by using the EEHG scheme, while causing little perturbation to the regular operation of a DLSR. | Wei-Hang Liu Guan-Qun Zhou Yi Jiao | 2018 | Nuclear Science and Techniques2018，29，10： | 4 |
| 7 | All-reflective self-referenced spectral interferometry for single-shot measurement of few-cycle femtosecond pulses in a broadband spectral range显示文摘An all-reflective self-referenced spectral interferometry based on the transient grating(TG)effect is proposed for single-shot measuring of the amplitude and phase of ultrashort pulses in a broadband spectral range.Except for a thin third-order nonlinear medium,which was used to generate the TG signal,no transmitted optics were used in the proposed device,and few-cycle pulses in a broad spectral range from deep UV to mid-IR can be characterized.With a homemade compact and alignment-free device,a 5.0 fs pulse at 800 nm corresponding to about two cycles and a 14.3 fs pulse at 1800 nm corresponding to less than three cycles were successfully characterized. | 司哲 申雄 朱晶鑫 林磊 白丽华 刘军 | 2020 | Chinese Optics Letters2020，18，2： | 4 |
| 8 | Synthesis of some three-qubit gates and their implementation in a three spins system coupled with Ising interaction显示文摘The synthesis of the Toffoli gate, Fredkin gate, three-qubit Inversion-on-equality gate and D(α) gate, as well as their implementation in a three spins system coupled with Ising interaction are investigated. The sequences of the control pulse and the drift process to implement these gates are given. It is revealed that the implementation of some three-qubit gates in a circular spin chain is much better than in a linear spin chain, and every two measurements of the quantum computation complexity are not always consistent. It is significant to directly study the implementation of the multi-qubit gates and even more complicated components of quantum information processing without resorting to their synthesis. | WEI HaiRui, DI YaoMin & WANG Yan School of Physics & Electronic Engineering, Xuzhou Normal University, Xuzhou 221116, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，4： | 4 |
| 9 | Revelation of the birth and extinction dynamics of solitons in SWNT-mode-locked fiber lasers显示文摘The dispersive Fourier transform(DFT) technique opens a fascinating pathway to explore ultrafast non-repetitive events and has been employed to study the build-up process of mode-locked lasers. However, the shutting process for the mode-locked fiber laser seems to be beyond the scope of researchers, and the starting dynamics under nearzero dispersion remains unclear. Here, the complete evolution dynamics(from birth to extinction) of the conventional soliton(CS), stretched pulse(SP), and dissipative soliton(DS) are investigated by using the DFT technique.CS, SP, and DS fiber lasers mode locked by single-walled carbon nanotubes(SWNTs) are implemented via engineering the intracavity dispersion map. The relaxation oscillation can always be observed before the formation of stable pulse operation due to the inherent advantage of SWNT, but it exhibits distinct evolution dynamics in the starting and shutting processes. The shutting processes are dependent on the dispersion condition and turn-off time, which is against common sense. Some critical phenomena are also observed, including transient complex spectrum broadening and frequency-shift interaction of SPs and picosecond pulses. These results will further deepen understanding of the mode-locked fiber laser from a real-time point of view and are helpful for laser design and applications. | YUDONG CUI XUEMING LIU | 2019 | Photonics Research2019，7，4： | 4 |
| 10 | Highly efficient TW multipass Ti:sapphire laser system显示文摘An efficient chirped-pulse amplification, Ti:sapphire laser system, has been developed using mainly domestic components. The gain-narrowing effect has been significantly overcome by shaping spectrum of seeding pulses. With a novel aberration-free stretcher and two stage multi-pass amplifiers, pulses with duration of 25 fs and 36-mJ energy have been obtained at 10 Hz repetition rate, using only less than 290 mJ green Nd: YAG pump energy. This corresponds to a 1.4 TW peak power and 32% main amplification efficiency. The energy stability of the laser systems is better than ± 3% . | 魏志义 张杰 夏江帆 冯宝华 张秀兰 邱阳 | 2000 | Science China Mathematics2000，43，10： | 3 |
| 11 | Interference effect of photoionization of hydrogen atoms by ultra-short and ultra-fast high-frequency chirped pulses显示文摘The photoionization of a hydrogen atom from its ground state with ultra-fast chirped pulses is investigated by numerically solving the time-dependent Schrodinger equation within length,velocity,and Kramers-Henneberger gauges.Converged results for all gauges for chirp-free pulses agree with the prediction of dynamic interference for ground state hydrogen atoms predicted recently by Jiang and Burgdorfer[Opt.Express 26,19921(2018)].In addition,we investigated photoelectron spectra of hydrogen atoms by chirped laser pulses,and showed that dynamic interference effect will be weaken for pulses with increasing linear chirp.Our numerical results can be understood and discussed in terms of an interplay of photoelectron wavepackets from first and second halves of laser enevelop,including the ac Stark energy level shift of the photoelectron final state and atomic stabilization effect at ultra-high intensities. | 王宁月 刘爱华 | 2019 | Chinese Physics B2019，28，8： | 3 |
| 12 | Experimental study and mechanism analysis on bioeffects by nanosecond electromagnetic pulses显示文摘The athermal bioeffects caused by nanosecond electromagnetic pulses with body cells was studied by using a broad band transverse EM-wave cell (BTEM CELL). The experimental system and preliminary mechanism analysis were presented. | 王保义 杨杰斌 郭庆功 徐润民 刘长军 张弘 邹方东 王子淑 | 1997 | Science China(Life Sciences)1997，40，3： | 3 |
| 13 | A systematic investigation of high harmonic generation using mid-infrared driving laser pulses显示文摘We report on a systematic investigation of the influences of gas pressure,focal position and focusing geometry on high harmonic generation by use of mid-infrared femtosecond laser pulses. We also discuss the spatial characteristics of harmonics under different focusing conditions. By optimizing the parameters,we experimentally observed the generation of 1 kHz,low divergence coherent X-ray beams in the water-window region. | YAO JinPing 1,2 ,XIONG Hui 1 ,XU Han 1 ,FU YuXi 1,2 ,ZENG Bin 1,2 ,CHU Wei 1,2 ,CHENG Ya 1 ,XU ZhiZhan 1 ,LIU XiaoJun 3 & CHEN Jing 4,5 1 State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071,China 4 Institute of Applied Physics and Computational Mathematics,Beijing 100088,China 5 Center for Applied Physics and Technology,Peking University,Beijing 100084,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，6： | 3 |
| 14 | Generation of double pulses at the Shanghai soft X-ray free electron laser facility显示文摘In this article, we present the promise of a new method generating double electron pulses in picosecondscale pulse length and tunable interpulse spacing at several picoseconds. This has witnessed an impressive potential of application in pump–probe techniques, two-color X-ray free electron laser, high-gradient witness bunch acceleration in a plasma, etc. Three-dimensional simulations are carried out to analyze the dynamic of the electron beam in a linear accelerator. Comparisons are made between the new method and existing ways. | Zhen Wang Chao Feng Qiang Gu Li-Hua Yu Zhen-Tang Zhao | 2017 | Nuclear Science and Techniques2017，28，3： | 2 |
| 15 | Effect of total number of pulses of radial extracorporeal shock wave therapy (rESWT) on hamstring muscle spasticity in children with spastic type cerebral palsy: A randomized clinical trial显示文摘Purpose To evaluate the efficacy and safety of radial extracorporeal shock wave therapy (rESWT) according to total number of pulses on hamstring muscle spasticity in children with spastic type cerebral palsy (CP).Methods This study is a randomized controlled trial consisting of thirteen patients with spastic CP, 9 males and 4 females, aged 5 to 14 years (mean age 9.2). Twenty-five spastic hamstring muscles were divided in four groups. Group I: 500 pulses, Group II: 1, 000 pulses, Group III: 1, 500 pulses, and Group IV: 2, 000 pulses. Australian Spasticity Assessment Scale (ASAS) was measured at four different time points (pre-ESWT, post-ESWT, 2 weeks post-ESWT, and 4 weeks post-ESWT).Results All four groups showed improvement in ASAS relative to pre-treatment, although only significant in Group III (1, 500 pulses). There were no statistically significant differences in ASAS between all four groups in pre-ESWT [|2(2)=3.907,P=0.272], immediately post-ESWT [|2(2)=1.250,P=0.741], 2 weeks post-ESWT vs pre-ESWT [|2(2)=3.367,P=0.338], and 4 weeks post-ESWT vs pre-ESWT [|2(2)=1.566,P=0.667].Conclusion The effect of rESWT on spastic hamstring in children with spastic CP is not dependent on the number of pulses. | Wardhani RK Wahyuni LK Laksmitasari B | 2022 | 中华物理医学与康复杂志2022，44，4： | 2 |
| 16 | Amplification and compression of Ti:sapphire femtosecond pulses at high-repetition-rate显示文摘The experiment of the generation and amplification of femetosecond Ti:sapphire laser pulse at high repetition rate is reported. The laser pulses with minimum pulsewidth 15 fs, maximum spectrum width of 80 nm, average power of 200 mW are generated from a home built self mode locked Ti:sapphire laser. As a seed pulse which is selected from the oscillator, the laser pulse is further amplified by using chirped pulse amplification technology in a Ti:sapphire amplifier from which a kind of pulses with single pulse energy of 100 μJ,pulsewidth after compressing of 50 fs at 5 kHz repetition rate are produced. The system design and experimental results are discussed. | 赵尚弘 王屹山 陈国夫 王贤华 侯洵 | 1998 | Science China Mathematics1998，41，1： | 2 |
| 17 | Experimental study and mechanism analysis on cell electroporation due to low-intensity transient electromagnetic pulses显示文摘The phenomenon of cell electroporation due to low-intensity transient electromagnetic pulses was studied by using a broad band transverse EM-wave cell (BTEM CELL). The experimental results and preliminary mechanism analysis are presented. | Changjun Liu Hong Zhang Baoyi Wang Zishu Wang Xizhong Wang | 1999 | Chinese Science Bulletin1999，44，22： | 1 |
| 18 | Ion motion effects on the generation of short-cycle relativistic laser pulses during radiation pressure acceleration显示文摘The effects of ion motion on the generation of short-cycle relativistic laser pulses during radiation pressure acceleration are investigated by analytical modeling and particle-in-cell simulations. Studies show that the rear part of the transmitted pulse modulated by ion motion is sharper compared with the case of the electron shutter only. In this study, the ions further modulate the short-cycle pulses transmitted. A 3.9 fs laser pulse with an intensity of 1.33×1021W cm-2is generated by properly controlling the motions of the electron and ion in the simulations. The short-cycle laser pulse source proposed can be applied in the generation of single attosecond pulses and electron acceleration in a small bubble regime. | W.P.Wang X.M.Zhang X.F.Wang X.Y.Zhao J.C.Xu Y.H.Yu L.Q.Yi Y.Shi L.G.Zhang T.J.Xu C.Liu Z.K.Pei B.F.Shen | 2014 | High Power Laser Science and Engineering2014，2，2： | 1 |
| 19 | Generation of two-color polarization-adjustable radiation pulses for storage ring light source显示文摘To date, two-color pulses are widely used in pump–probe experiments. For a ring-based light source, the power of the spontaneous radiation fluctuates randomly in the longitudinal direction. It is difficult to produce twocolor double pulses by optical methods. In this paper, we introduce a method based on the echo-enabled harmonic generation scheme that generates two-color pulses in a storage ring light source. By adopting crossed undulators and a phase shifter, the polarization of the two-color pulses can be easily switched. A numerical simulation based on a diffraction-limited storage ring, the Hefei Advanced Light Source, suggests that the time delay and spectral separation of the two pulses can be adjusted linearly by changing the pulse duration and chirp parameters of the seed laser. A circular polarization degree above 80% could be achieved. | Wei-Hang Liu Yi Wu Yi Jiao Zheng-He Bai Sheng Wang | 2019 | Nuclear Science and Techniques2019，30，4： | 1 |
| 20 | Characteristics of filamentation in ZK7 glass by negatively chirped femtosecond laser pulses显示文摘The filamentation characteristics of femtosecond laser pulses in ZK7 glass are in- vestigated experimentally as a function of initial negative chirps. It is found that the filament threshold power grows rapidly and the filament length extends over a long distance with increasing initial temporal chirps. The measurement of supercon- tinuum reveals that the plasma generation process within filamentation becomes weaker as the initial negative chirp increases, leading to a self-guiding long light channel dominated by Kerr nonlinearity. The interference of transverse rings in multifilamentation of the chirped laser pulses is observed as well. Analyses and discussions give an interpretation of this chirp-induced ionization-free filamenta- tion. These results indicate that initial chirps will play a crucial role in the filament formation of ultrashort laser pulses in transparent media. | YANG JianJun YANG Yang WANG Rui HAN Wei | 2008 | Science China(Technological Sciences)2008，51，7： | 1 |
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