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Chengyin Wu on Muck Rack

Chengyin Wu

As seen in: Nature, Physical Review B
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By Chengyin Wu
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Revisiting self-seeding mechanism by generating vector ultraviolet $${{{\rm{N}}}}_{2}^{+}$$N2+ lasing - Communications Physics

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By Jingsong Gao, Yang Wang, Jiahao Dong, Yi Liu, Chengyin Wu, Hongbing Jiang, Yunquan Liu, Haicheng Mei
| Nature Verified
Abstract An intense femtosecond laser pulse can generate ultraviolet air lasing, offering a promising remote light source. A long-standing hypothesis is whether it is seeded by a self-generated spectral component, such as the second harmonic that is inevitably produced by the plasma gradient. Here, we report the generation of both radially and azimuthally polarized \({{{\rm{N}}}}_{2}^{+}\) lasing driven by a single 800-nm cylindrical vector beam.
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Entangled X-Ray Photon Pair Generation by Free-Electron Lasers

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By Linfeng Zhang, Dongyu Liu, Chengyin Wu, Zunqi Li
| Physical Review B
Abstract We investigate entangled x-ray photon pair emissions in a free-electron laser (FEL) and establish a quantum electrodynamical theory for coherently amplified entangled photon pair emission from microbunched electron pulses in the undulator. We provide a scheme to generate highly entangled x-ray photon pairs and numerically demonstrate the properties of entangled emission, which is of great importance in x-ray quantum optics.
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