Kun Zhao

Kerr spectral broadening and temporal compression of bright squeezed vacuum

Zhu XiaoXian, Yitan Gao, Zhiyuan Zhou, Yudong Yang et autres

Abstract We theoretically investigate the nonlinear spectral broadening of bright squeezed vacuum (BSV) driven by Kerr nonlinearity in bulk sapphire and demonstrate a route toward generating ultrafast broadband BSV-based light. By analyzing the spectral evolution and frequency correlations during nonlinear propagation, we …

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EntiTractor: entity extraction for coherent hallucination correction in paragraph-level text

Jingyi Yao, Weifei Zang, Kun Zhao, H Michael Zhang et autres

Autocorrelation measurement of attosecond pulses based on two-photon double ionization

Kun Zhao, Bingbing Wang, Xin-Kui He, Zhiyi Wei

Autocorrelation measurement is theoretically demonstrated to characterize attosecond pulses by studying the two-photon double ionization (TPDI) process. An interferometric autocorrelation curve is presented in the change of TPDI probability with the time delay between two identical attosecond pulses, and its full width …

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Applications of time-of-flight photoelectron spectrometers in ultrafast optical experiments

朱孝先 Zhu Xiaoxian, Yitan Gao, Yiming Wang, Kun Zhao

Time-of-flight photoelectron spectroscopy (TOF-PES) with exceptional energy and temporal resolution has emerged as a cornerstone diagnostic tool in attosecond science and ultrafast dynamics. This work comprehensively reviews the TOF-PES technology, its basic principles, and its crucial role in attosecond metrology. The first …

MeloTrans: A Text to Symbolic Music Generation Model Following Human Composition Habit

Yutian Wang, Wanyin Yang, Y. Zhang, Kun Zhao et autres

At present, neural network models show powerful sequence prediction ability and are used in many automatic composition models. In comparison, the way humans compose music is very different from it. Composers usually start by creating musical motifs and then develop them into …

Free-space competition between gain-swept superradiance and spontaneous emission from N2+ in a femtosecond filament

Yuxuan Zhang, Yitan Gao, Hongbin Lei, Zoumingyang Zhu et autres

Air lasing from the singly ionized nitrogen molecule ${{\text{N}}_{2}}^{+}$ in a femtosecond laser filament under low gas pressures has been of intense interest in the field of ultrafast optics in the past decade. Several theoretical models have been proposed to explain the …

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Simple pulse preshaping method for realizing self-similar amplification efficiently with a narrow bandpass filter

Kun Zhao, Menglin Liu, Lisha Wang, Huanxin Li et autres

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Optical Fiber Sensor with Novel Structure and Its Applications in Oil and Gas Exploration

Yuhua Xie, Kun Zhao, Hengle Li

Compared to electronic sensors, Optical Fiber Sensors (OFSs) have received increasing attention due to their advantages, such as small size, light weight, anti-electromagnetic interference, easy reuse, and remote sensing. This paper proposes a novel all-fiber mode interferometer. This interferometer excites higher-order cladding …

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Multi-wavelength mode-locked erbium-doped fiber laser employing NPR and multi-mode fiber

Menglin Liu, Xiaorong Gu, Kun Zhao, Minzhe Liu et autres

An erbium-doped fiber laser based on nonlinear polarization rotation (NPR) mode-locking is proposed. On account of the multi-mode interference filtering effect introduced by the laser cavity multi-mode fiber, by adjusting the cavity polarization controllers, the laser generates dual-wavelengths of 1533.48 nm/1547.61 nm, …

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Experimental study on spectral morphological changes of narrow pulse width picosecond lasers

Lisha Wang, Kun Zhao, Minzhe Liu, Menglin Liu et autres

Using ytterbium doped single-clad/double-clad fiber amplifiers, different amplification experiments were conducted on narrow pulse width picosecond light, and the influence of self-phase modulation on pulse frequency domain characteristics during amplification was analyzed. A self developed picosecond oscillator based on semiconductor saturable absorber …

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Time-resolved ARPES with tunable 12–21.6 eV XUV at 400 kHz repetition rate

Famin Chen, Ji Wang, Mojun Pan, Junde Liu et autres

Time-resolved and angle-resolved photoemission spectroscopy (trARPES) is a powerful method to detect the non-equilibrium electronic structure in solid systems. In this study, we report a trARPES apparatus with tunable photon energy selectively among 12, 16.8, and 21.6 eV at a repetition rate …

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High-flux wavelength tunable XUV source in the 12–40.8 eV photon energy range with adjustable energy and time resolution for Tr-ARPES applications

Ji Wang, Famin Chen, Mojun Pan, Siyuan Xu et autres

High-order harmonic generation (HHG) has a broad spectrum covering vacuum ultraviolet to extreme ultraviolet (XUV) bands, which is useful for applications involving material analyses at different information depths. Such an HHG light source is perfect for time- and angle-resolved photoemission spectroscopy. Here, …

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