Baochang Li

Nanjing University of Science and Technology

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Cheng Jin

Beijing Information Science & Technology University

Xiangyu Tang

Nanjing University of Science and Technology

Kan Wang

Chinese Academy of Sciences

C. D. Lin

Kansas State University

Bincheng Wang

Nanjing University of Science and Technology

Yanbo Chen

North China Electric Power University

Zhong Guan

Sun Yat-sen Memorial Hospital

Yong Fu

Nanjing University of Science and Technology

Yufei Tan

Harbin Institute of Technology

Chi Zhang

Nanjing University of Science and Technology

Cooperative Institutions

Nanjing University of Science and Technology

Harbin Engineering University

Chinese Academy of Sciences

Ministry of Industry and Information Technology

Harbin Institute of Technology

Fudan University

Tianjin University

Zhejiang University

University of Science and Technology of China

Sichuan University

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Optimal generation and isolation of attosecond pulses in an overdriven ionized medium

Optics Letters (2021)

Xiangyu Tang Kan Wang Baochang Li Yanbo Chen C. D. Lin

We identify optimal conditions for the generation and isolation of attosecond pulses in an overdriven ionized medium. In a high-pressure and highly ionized gas, the spatiotemporal wavefront rotation of a driving laser can be optimized, leading to complete spatial separation of successive attosecond bursts in the far field. The resulting isolated attosecond pulses (IAPs) are much more divergent such that they are spatially separated from the driving laser in the far field. We show that the time delay of near-field harmonic emission along the radial distance determines the divergence of the attosecond burst in the far field. The generated IAPs are phase matched upon propagation in the second half of the gas medium. Validity of the generation scheme is tested at different carrier-envelope phases for a few-cycle laser pulse and by synthesizing the fundamental and its second harmonic field for a long-duration pulse.

Attosecond

Carrier-envelope phase

Extreme ultraviolet

Harmonic

10.1364/ol.441365

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Citations (16)

Spatially resolved macroscopic near-threshold harmonics generated from harmoniclike and resonant transitions using an artificial neural network

Physical review. A/Physical review, A (2023)

Bincheng Wang Tianyu Wen Yong Fu Baochang Li Kan Wang

We investigate the generation of near-threshold harmonics (NTHs) based on solving the three-dimensional time-dependent Schr\"odinger equation and utilizing an artificial neural network as a surrogate model to study the macroscopic propagation. Through our research, we identify two distinct pathways for NTH generation: harmoniclike transition and resonant transition. These pathways exhibit varying laser-parameter dependencies and phase-matching conditions, making it possible to spatially separate and selectively enhance NTHs by manipulating laser parameters in experimental setups. Our study provides insights into the underlying physics of the NTH macroscopic propagation and presents a methodology that can be applied to computationally intensive problems in the field of strong-field physics.

10.1103/physreva.108.053510

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Citations (2)

Characterization of a shaped isolated attosecond pulse and retrieval of infrared-laser-related information using high-order-harmonic-generation streaking spectra

Physical review. A/Physical review, A (2024)

K.-A. Wang Yong Fu Baochang Li Xiangyu Tang Zhong Guan

An all-optical method for directly reconstructing the spectral phase of an isolated attosecond pulse (IAP) has been proposed recently [New J. Phys. 25, 083003 (2023)]. This method is based on high-harmonic-generation (HHG) streaking spectra generated by an IAP and a time-delayed intense infrared (IR) laser, which can be accurately simulated by an extended quantitative rescattering model. Here, we extend the retrieval algorithm in this method to successfully retrieve the spectral phase of a shaped IAP, which has a spectral minimum, a phase jump about $\ensuremath{\pi}$, and a ``split'' temporal profile. We then reconstruct the carrier-envelope phase of the IR laser from HHG streaking spectra. Finally, we discuss retrieval of the phase of high harmonics by the intense IR laser alone using the Fourier transform of HHG streaking spectra.

Streaking

Attosecond

Harmonic

10.1103/physreva.109.023117

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Citations (0)

Generation of isolated soft x-ray attosecond pulses with mid-infrared driving lasers via transient phase-matching gating

New Journal of Physics (2021)

Baochang Li Kan Wang Xiangyu Tang Yanbo Chen C. D. Lin

Abstract Isolated attosecond pulses (IAPs) in the soft x-ray (SXR) region are highly desirable for attosecond time-resolved experiments. Here we identify a transient phase matching gating method for the generation of such IAPs with mid-infrared (MIR) lasers. This gating method works when a loosely focused, long-duration MIR Gaussian driving beam is slightly reshaped during its propagation in the gas medium under the ‘critical’ ionization condition. Quantitatively, the calculated coherence length of high harmonic is used to analyze the mechanism of the gating method, by using one-dimensional plane-wave beams and by comparing 2000 nm and 800 nm lasers. The robustness of the generation method is checked by varying laser’s carrier-envelope-phase and gas pressure. This gating method provides with an alternative route to efficiently produce tabletop ultrashort attosecond SXR light sources with the emerging MIR lasers.

Attosecond

Water window

10.1088/1367-2630/ac136f

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Citations (11)

Thermal Bridge Effect of Aerated Concrete Block Wall in Cold Regions

IOP Conference Series Earth and Environmental Science (2018)

Baochang Li Lirong Guo Yubao Li Tiantian Zhang Yufei Tan

As a self-insulating building material which can meet the 65 percent energy-efficiency requirements in cold region of China, aerated concrete blocks often go moldy, frost heaving, or cause plaster layer hollowing at thermal bridge parts in the extremely cold regions due to the restrictions of environmental climate and construction technique. L-shaped part and T-shaped part of aerated concrete walls are the most easily influenced parts by thermal bridge effect. In this paper, a field test is performed to investigate the scope of the thermal bridge effect. Moreover, a heat transfer calculation model for L-shaped wall and T-shaped wall is developed. According to the simulation results, the temperature fields of the thermal bridge affected regions are simulated and analyzed. The research outputs can provide theoretical basis for the application of aerated concrete wall in extremely cold regions.

Bridge (graph theory)

Thermal bridge

Frost (temperature)

Scope (computer science)

Cold climate

Cold winter

Autoclaved aerated concrete

10.1088/1755-1315/108/2/022041

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Citations (1)

Urban microclimate differences in continental zone of China

Renewable and Sustainable Energy Reviews (2024)

Qi Jia Yian Zhu Tiantian Zhang Shuling Li Dongliang Han

Microclimate

10.1016/j.rser.2024.114392

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Citations (3)

Nonlinear absorption and optical limiting properties of nickel molybdate carbon nanotube composites

Journal of Nonlinear Optical Physics & Materials (2024)

Baochang Li Mingze Sun Gang Yao Bo Tian

The nickel molybdate carbon nanotube composites [Formula: see text] were synthesized by solution blending method. The [Formula: see text] were characterized by scanning electron microscopy (SEM), Raman spectroscopy and UV–Vis absorption spectroscopy. The [Formula: see text] organic glasses were obtained by dispersing [Formula: see text] in methyl methacrylate (MMA) and polymerizing in a water bath at [Formula: see text] for 1[Formula: see text]h. The nonlinear optical (NLO) properties were measured via [Formula: see text]-scan technique. By testing we obtained that [Formula: see text] has a reverse saturation absorption (RSA) effect and optical limiting (OL) performance. In addition, the RSA effect is enhanced compared to other similar materials. The OL threshold [Formula: see text] and the normalized transmittance clamping value [Formula: see text] are calculated and fitted to be [Formula: see text] and [Formula: see text], respectively. Consequently, [Formula: see text] have significant research value in the direction of extending new materials for laser protection.

Limiting

10.1142/s0218863524500310

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Effect of laser focus in two-color synthesized waveform on generation of soft x-ray high harmonics

Chinese Physics B (2022)

Yanbo Chen Baochang Li Xuhong Li Xiangyu Tang Chi Zhang

Synthesis of multi-color laser pulses has been developed as a promising way to improve low conversion efficiency of high-order harmonic generation (HHG). Here we systematically study the effect of laser focus in a two-color waveform on generation of macroscopic HHG in soft x-rays. We find that the dependence of HHG yields on laser focus at low or high gas pressure is sensitive to the characteristics of single-atom harmonic response, in which “short”- or “long”-trajectory emissions can be selectively controlled by changing the waveform of two-color synthesized laser pulse. We uncover the phase-matching mechanism of HHG in the gas medium by examining the propagation of the two-color waveform and the evolution of time-frequency emissions of high-harmonic field. We further reveal that the nonlinear effects, such as geometric phase, atomic dispersion, and plasma defocusing, are responsible for modification of two-color waveform upon propagation. This work can be used to find better macroscopic conditions for generating soft x-ray HHG by employing two-color optimized waveforms.

Harmonic

10.1088/1674-1056/ac8cea

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Citations (2)

Extension of all-optical reconstruction method for isolated attosecond pulses using high-harmonic generation streaking spectra

arXiv (Cornell University) (2023)

Kan Wang Yong Fu Baochang Li Xiangyu Tang Zhong Guan

An all-optical method for directly reconstructing the spectral phase of isolated attosecond pulse (IAP) has been proposed recently [New J. Phys. 25, 083003 (2023)]. This method is based on the high-harmonic generation (HHG) streaking spectra generated by an IAP and a time-delayed intense infrared (IR) laser, which can be accurately simulated by an extended quantitative rescattering model. Here we extend the retrieval algorithm in this method to successfully retrieve the spectral phase of an shaped IAP, which has a spectral minimum, a phase jump about $\pi$, and a "split" temporal profile. We then reconstruct the carrier-envelope phase of IR laser from HHG streaking spectra. And we finally discuss the retrieval of the phase of high harmonics by the intense IR laser alone using the Fourier transform of HHG streaking spectra.

Streaking

Attosecond

Envelope (radar)

10.48550/arxiv.2309.02647

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Citations (0)

Saturable absorption and self-focusing properties of copper molybdate with flower structure

Optik (2022)

Tianjiao Zhang Yuting Wang Chenggang Yuan Bingkun Chen Pengyu Wang

Saturable absorption

Nanomaterials

Molar absorptivity

10.1016/j.ijleo.2022.168922

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Citations (6)