Signature of superradiance from a nitrogen-gas plasma channel produced by strong-field ionization

Li, Guihua; Jing, Chenrui; Zeng, Bin; Xie, Hongqiang; Yao, Jinping; Chu, Wei; Ni, Jielei; Zhang, Haisu; Xu, Huailiang; Cheng, Ya; Xu, Zhizhan

doi:10.1103/physreva.89.033833

Cited by 79 publications

(60 citation statements)

References 41 publications

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“…One can see that the built‐up delay and the pulse duration are inversely proportional to the gas pressure p , while the peak power scales up quadratically with p . This confirms that the 391.4‐nm radiation is of the nature of superradiance …”

Section: Molecular Nitrogen Ion Lasingsupporting

confidence: 71%

Recent Advances in Air Lasing: A Perspective from Quantum Coherence

et al. 2019

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The research topic of air lasing is of fundamental and practical importance, which has grown rapidly in the past decade. Air lasing, or a laser‐like emission from air species including atomic oxygen, atomic argon, atomic nitrogen, molecular nitrogen, and molecular nitrogen ions, has been investigated vastly in both experiment and theory. In this review, the basic concepts of air lasing are discussed and the crucial role of quantum coherence in the air‐lasing process is highlighted. As an exciting perspective, air lasing not only exhibits important fundamental physics such as superradiance, nonlinear effects, vibrational and rotational dynamics, but also shows potential practical implications toward remote sensing.

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Section: Molecular Nitrogen Ion Lasingsupporting

confidence: 71%

Recent Advances in Air Lasing: A Perspective from Quantum Coherence

et al. 2019

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“…[20,21]. The femtosecond laser beam (1 kHz, 800 nm, ~40 fs) produced by a commercial Ti:sapphire laser system (Legend Elite-Duo, Coherent, Inc) was divided into two arms.…”

Section: Methodsmentioning

confidence: 99%

“…It is noteworthy that although the existence of population inversion has been confirmed with systematic experimental investigations, the mechanism behind the establishment of the inverted population within an ultra-short period of only ~100 fs is still under hot debate. In fact, several models have been proposed to understand the physics of such air laser, including stimulated emission based on seed amplification in a population inverted system, four-wave mixing, and seed-triggered superradiance [17][18][19][20]. Nevertheless, none of these models has been completely confirmed and widely accepted.…”

Section: Introductionmentioning

confidence: 99%

Real-time observation of dynamics in rotational molecular wave packets by use of air-laser spectroscopy

Zeng

Chu

et al. 2014

Phys. Rev. A

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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 coherent superposition of quantum rotational states created in a field-free molecular alignment. We show that this technique uniquely allows real-time observation of the ultrafast dynamics of the molecular rotational wave packet. Our analysis also shows that there exist two channels of generation of the nitrogen laser, shedding new light on the population inversion mechanism behind the air laser generated by intense femtosecond laser pulses. PACS number(s):

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“…For example, it was demonstrated that the signals of air lasers at 391 nm and 428 nm, which respectively correspond to the (0–0) and (0–1) vibrational transitions between the B 2 Σ u + and X 2 Σ g + states of N 2 + , showed different behaviors when the polarization of the pump laser evolves from linear to circular . In addition, under low pressures at tens of mbar, superradiance owing to the quantum coherence via cooperation of an ensemble of excited N 2 + molecules may dominate the forward emissions when the dephasing time is long enough .…”

Section: Remote Lasing Actions By Femtosecond Laser Pulsesmentioning

confidence: 99%

Femtosecond laser ionization and fragmentation of molecules for environmental sensing

Cheng

Chin

et al. 2015

Laser & Photonics Reviews

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112

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Recent studies have demonstrated that femtosecond laser pulses have high potential in application to environmental science. Because of the properties of ultrafast, broadband and high power, the propagation of femtosecond laser pulses in air can lead to the generation of a strong field of 1013–1014 W/cm2 with a large distance range from meter to kilometers. The strong laser field induces ionization and fragmentation of molecules in the laser propagation path, resulting in characteristic fingerprint emissions. This paper mainly focuses on recent research advances in environmental sensing by using femtosecond laser pulses through strong‐field‐induced ionization and fragmentation of molecules. The fingerprint emissions of molecules in strong laser fields are discussed based on the understanding of strong‐field–molecule interactions in atmospheric as well as in vacuum environments. This is followed by a comprehensive review of several recently developed optical methods for coherent control of fingerprint emissions of molecules. Lastly, both current challenges and a future perspective of this dynamic field are discussed.

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Signature of superradiance from a nitrogen-gas plasma channel produced by strong-field ionization

Cited by 79 publications

References 41 publications

Recent Advances in Air Lasing: A Perspective from Quantum Coherence

Recent Advances in Air Lasing: A Perspective from Quantum Coherence

Real-time observation of dynamics in rotational molecular wave packets by use of air-laser spectroscopy

Femtosecond laser ionization and fragmentation of molecules for environmental sensing

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