Chaohui Zhou

Jan 22, 2025 | mdpi.com | Chaohui Zhou |Yue Hu |Rujie Liu |Yuce Liu

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Jun 28, 2024 | mdpi.com | Chaohui Zhou |Yue Hu |Yuce Liu |Rujie Liu

All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.

Apr 30, 2024 | opg.optica.org | Chaohui Zhou |Siyu Qin |Xiaojing Liu |Qi Lu

We report on an optical amplification and energy threshold of the two most prominent emission lines, 391.4 and 427.8 nm, of the cavity-less lasing of nitrogen ions pumped by femtosecond laser pulses. It was found that the two transitions both show optical amplification under a low gas pressure condition, while the 391.4 nm emission is barely amplified under high gas pressure.