287 citations · 1.1k across the 24 of their papers we have counts for
25 papers
Generation of elliptically polarized nitrogen-ion laser fields using two-color femtosecond laser pulses
Ziting Li, Bin Zeng, Wei Chu +6
We experimentally investigate generation of molecular nitrogen-ion lasers with two femtosecond laser pulses at different wavelengths. The first pulse serves as the pump which ioniz…
Time-resolved shadowgraphs of transient plasma induced by spatiotemporally focused femtosecond laser pulses in fused silica glass
Zhaohui Wang, Bin Zeng, Guihua Li +7
We report on experimental observations of formation and evolution of transient plasma produced in fused silica glass with spatiotemporally focused (STF) femtosecond laser pulses us…
Non-perturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields
Guihua Li, Hongqiang Xie, Ziting Li +4
We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly no…
Population Redistribution among Multiple Electronic States of Molecular Nitrogen Ions in Strong Laser Fields
Jinping Yao, Shicheng Jiang, Wei Chu +11
We carry out a combined theoretical and experimental investigation on the population distributions in the ground and excited states of tunnel ionized N2 molecules at various driver…
Spatiotemporal focusing does not always improve axial intensity localization
Ya Cheng, Hongqiang Xie, Zhaohui Wang +6
We report on an experimental comparison on critical intensities of nonlinear self-focusing in air with conventional focusing and spatiotemporal focusing schemes. Our results show t…
Backward air lasing actions induced by femtosecond laser filamentation: influence of population inversion lifetime
Hongqiang Xie, Guihua Li, Wei chu +5
We experimentally investigate generation of backward 357 nm N2 laser in a gas mixture of N2/Ar using 800-nm femtosecond laser pulses, and examine the involved gain dynamics based o…
Interferometric characterization of pulse front tilt of spatiotemporally focused femtosecond laser pulses for three-dimensional micromachining application
Zhaohui Wang, Fei He, Jielei Ni +6
We report on an experimental measurement of the pulse front tilt (PFT) of spatiotemporally focused femtosecond laser pulses in the focal plane in both air and bulk transparent mate…
Gain dynamics of a free-space nitrogen laser pumped by circularly polarized femtosecond laser pulses
Jinping Yao, Hongqiang Xie, Bin Zeng +9
We experimentally demonstrate ultrafast dynamic of generation of a strong 337-nm nitrogen laser by injecting an external seed pulse into a femtosecond laser filament pumped by a ci…
Impulsive rotational Raman scattering of N2 by a remote "air laser" in femtosecond laser filament
Jielei Ni, Wei Chu, Haisu Zhang +8
We report on experimental realization of impulsive rotational Raman scattering from neutral nitrogen molecules in a femtosecond laser filament using an intense self-induced white-l…
Real-time observation of dynamics in rotational molecular wave packets by use of "air laser" spectroscopy
Bin Zeng, Wei Chu, Guihua Li +6
Molecular rotational spectroscopy based on strong-field-ionization-induced nitrogen laser is employed to investigate the time evolution of the rotational wave packet composed by a…
Second harmonic generation in a centrosymmetric gas medium with spatiotemporally focused intense femtosecond laser pulses
Guihua Li, Jielei Ni, Hongqiang Xie +9
We demonstrate unexpectedly strong second harmonic generation (SHG) in Argon gas by use of spatiotemporally focused (SF) femtosecond laser pulses. The resulting SHG by the SF schem…
Signature of superradiance from a nitrogen gas plasma channel produced by strong field ionization
Guihua Li, Chenrui Jing, Bin Zeng +8
Recently, Yao et al. demonstrated the creation of coherent emissions in nitrogen gas with two-color (800 nm + 400 nm) ultrafast laser pulses [New J. Phys. 15, 023046 (2013)]. Based…
Terahertz Wave Guiding by Femtosecond Laser Filament in Air
Jiayu Zhao, Yizhu Zhang, Zhi Wang +5
Femtosecond laser filament generates strong terahertz (THz) pulse in air. In this paper, THz pulse waveform generated by femtosecond laser filament has been experimentally investig…
Self-induced white-light seeding laser in a femtosecond laser filament
Wei Chu, Guihua Li, Hongqiang Xie +8
We report, for what we believe to be the first time, on the generation of remote self-seeding laser amplification by using only one 800 nm Ti:Sapphire femtosecond laser pulse. The…
Signature of multi-channel interference in high-order harmonic generation from N2 driven by intense mid-infrared pulses
Guihua Li, Jinping Yao, Xinhua Xie +10
We investigate the multi-electron dynamics in high-order harmonic generation (HHG) from N2 molecules. Clear spectral minima are observed in the cutoff region at all three mid-infra…
Reconstruction of a Rotational Wavepacket of Inverted Molecular Ions in an Intense Femtosecond Laser Field
Haisu Zhang, Chenrui Jing, Jinping Yao +10
We report on generation of a rotational wavepacket in the ground vibronic state (v = 0) of excited electronic B2Σu+ state of N2+ in a femtosecond laser induced plasma spark. Decodi…
Low-threshold whispering-gallery-mode microlasers fabricated in a Nd: glass substrate by three-dimensional femtosecond laser micromachining
Jintian Lin, Yingxin Xu, Jiangxin Song +6
We report on fabrication of whispering-gallery-mode microlasers in a Nd:glass chip by femtosecond laser three-dimensional (3D) micromachining. Main fabrication procedures include t…
Alignment-dependent fluorescence emission induced by tunnel ionization of carbon dioxide from lower-lying orbitals
Jinping Yao, Guihua Li, Xinyan Jia +13
Study on ionization process of molecules in an intense infrared laser field is of paramount interest in strong-field physics and constitutes the foundation of imaging of molecular…
Remote creation of strong and coherent emissions in air with two-color ultrafast laser pulses
Jinping Yao, Guihua Li, Chenrui Jing +11
We experimentally demonstrate generation of strong narrow-bandwidth emissions with excellent coherent properties at ~391 nm and ~428 nm from molecular ions of nitrogen inside a fem…
Harmonic-seeded remote laser emissions in N2-Ar, N2-Xe and N2-Ne mixtures: a comparative study
Jielei Ni, Wei Chu, Haisu Zhang +9
We report on the investigation on harmonic-seeded remote laser emissions at 391 nm wavelength from strong-field ionized nitrogen molecules in three different gas mixtures, i.e., N2…
Ionization Suppression of Diatomic Molecules in Intense Midinfrared Laser Field
Z. Lin, X. Y. Jia, C. Wang +11
Diatomic molecules (e.g., O) in intense laser field exhibit a peculiar suppressed ionization behavior compared to their companion atoms. Several physical models have been propo…
Comparative investigation of third and fifth harmonic generation in atomic and molecular gases driven by mid-infrared ultrafast laser pulses
Jielei Ni, Jinping Yao, Bin Zeng +7
We report on the comparative experimental investigation on third and fifth harmonic generation (THG and FHG) in atomic and molecular gases driven by mid-infrared ultrafast laser pu…
Direct generation of intense extreme ultraviolet supercontinuum with 35 fs, 11 mJ pulses from a femtosecond laser amplifier
Bin Zeng, Wei Chu, Guihua Li +5
We report on the generation of intense extreme ultraviolet (EUV) supercontinuum with photon energies spanning from 35 eV to 50 eV (i. e., supporting an isolated attosecond pulse wi…
High-brightness switchable multi-wavelength remote laser in air
Jinping Yao, Bin Zeng, Huailiang Xu +7
Remote laser in air based on amplified spontaneous emission (ASE) has produced rather well-collimated coherent beams in both backward and forward propagation directions, opening up…