Sainan Peng

Hubei University of Chinese Medicine

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Jing Ai

University of Technology Sydney

Weijun Zhang

China University of Geosciences

Dongsheng Wang

Zhejiang University

Lanfeng Li

China University of Geosciences

Qilin Wang

University of Technology Sydney

Zhiyue Wang

University of Science and Technology of China

Weijun Zhang

China University of Geosciences

Peng Yang

Northeast Electric Power University

Yu Zhang

China University of Geosciences

Yu Zhang

University of California, Los Angeles

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China University of Geosciences

Chinese Academy of Sciences

Nanjing University of Chinese Medicine

Hubei University of Chinese Medicine

Jiangsu Province Hospital

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Zhejiang University

Nanjing University

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Research Center for Eco-Environmental Sciences

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Extension of the bright high-harmonic photon energy range via nonadiabatic critical phase matching

arXiv (Cornell University) (2022)

Zongyuan Fu Yudong Chen Sainan Peng Bingbing Zhu Baochang Li

Extending the photon energy range of bright high-harmonic generation to cover the entire soft X-ray region is important for many applications in science and technology. The concept of critical ionization fraction has been essential, because it dictates the maximum driving laser intensity that can be used while preserving bright harmonic emission. In this work, we reveal a second, nonadiabatic critical ionization fraction that substantially extends the maximum phase-matched high-harmonic photon energy, that arises due to strong reshaping of the intense driving laser field. We validate this understanding through a systematic comparison between experiment and theory, for a wide range of pulse durations and driving laser wavelengths. In particular, high harmonics driven by intense few-cycle pulses experience the most pronounced spectral reshaping, significantly extending the bright photon energy range. We also present an analytical model that predicts the spectral extension that can be achieved for different driving lasers. This reveals an increasing role of nonadiabatic critical phase matching when driven by few-cycle mid-infrared lasers. These findings are important for the development of high-brightness soft X-ray sources for applications in spectroscopy and imaging.

Photon energy

Harmonic

10.48550/arxiv.2206.07241

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Vermicomposting preferably alters fungal communities in wasted activated sludge and promotes the production of plant growth-promoting biostimulants in the vermicompost

Chemical Engineering Journal (2024)

Yu Zhang Hao Yuan Sainan Peng Zhiyue Wang Siying Cai

Eisenia fetida

10.1016/j.cej.2024.153232

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Citations (4)