Lasing without population inversion in N2+

Mysyrowicz, A.; Danylo, Rostyslav; Houard, Aurélien; Tikhonchuk, V. T.; Zhang, X.; Fan, Zhiyuan; Liang, Qi; Zhuang, Songlin; Yuan, Luqi; Liu, Y.

doi:10.1063/1.5116898

Cited by 67 publications

(50 citation statements)

References 30 publications

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“…In the N

_{2}^{+}

lasing, the quantum coherence not only brings strong nonlinear effects, but also leads to the superradiant emission and also the coherent control, which have been observed with N

_{2}^{+}

ions.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 95%

“…In contrast, we found that the fluorescence signal at 391.4 nm does not show any significant change for the time delay tuning. It indicates that the population density in the

B^{2} {normalΣ}_{u}^{+}

state is not changed in the presence of the weak 800 nm control pulse …”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 97%

“…Therefore, the process of the N

_{2}^{+}

lasing spans over different timescales and hence provides a versatile platform for investigating molecular dynamics, ultrafast nonlinear phenomena, and quantum optics in the system of molecular ions . On the other hand, the understanding of the gain mechanism in N

_{2}^{+}

lasing is highly desired in the strong‐field‐ionization framework, which has motivated many tentative and interesting explanations . Up to now, it is still lack of a complete physical picture to explain all key experimental observations on N

_{2}^{+}

lasing.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

“…One key feature of superradiance is the formation of the macroscopic quantum coherence inside the media between the corresponding energy levels . To probe the presence of the macroscopic coherence in the N

_{2}^{+}

lasing process, two experiments have been performed . In one experiment, to address the quantum coherence between the

B^{2} {normalΣ}_{u}^{+}

and

X^{2} {normalΣ}_{g}^{+}

states, two seeding pulses at 391 nm have been injected into the plasma, after the passage of the intense pump pulse at 800 nm.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

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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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“…In the N

_{2}^{+}

lasing, the quantum coherence not only brings strong nonlinear effects, but also leads to the superradiant emission and also the coherent control, which have been observed with N

_{2}^{+}

ions.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 95%

“…In contrast, we found that the fluorescence signal at 391.4 nm does not show any significant change for the time delay tuning. It indicates that the population density in the

B^{2} {normalΣ}_{u}^{+}

state is not changed in the presence of the weak 800 nm control pulse …”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 97%

“…Therefore, the process of the N

_{2}^{+}

_{2}^{+}

_{2}^{+}

lasing.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

_{2}^{+}

lasing process, two experiments have been performed . In one experiment, to address the quantum coherence between the

B^{2} {normalΣ}_{u}^{+}

and

X^{2} {normalΣ}_{g}^{+}

states, two seeding pulses at 391 nm have been injected into the plasma, after the passage of the intense pump pulse at 800 nm.…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

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Recent Advances in Air Lasing: A Perspective from Quantum Coherence

et al. 2019

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“…In the recent work of Ref. [35], a different lasing without an inversion mechanism has been proposed to cause the gain at the 391 nm line based on the existence of long-lived coherent polarizations coupling simultaneously the states X , B, and the intermediate first excited electronic state A in N + 2 . The present amplification scheme relies on rotational dynamics and does not require coherences between the electronic states of the ion, even though such coherence is inevitably created by the pump pulse driving the molecular ion after ionization of the neutral.…”

Section: Introductionmentioning

confidence: 99%

Rotational Quantum Beat Lasing without Inversion

Richter

Lytova

Morales

et al. 2020

OSA High-Brightness Sources and Light-Driven Interactions Congress 2020 (EUVXRAY, HILAS, MICS)

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In standard lasers, light amplification requires population inversion between an upper and a lower state to break the reciprocity between absorption and stimulated emission. However, in a medium prepared in a specific superposition state, quantum interference may fully suppress absorption while leaving stimulated emission intact, opening the possibility of lasing without inversion. Here we show that lasing without inversion arises naturally during propagation of intense femtosecond laser pulses in air. It is triggered by the combination of molecular ionization and molecular alignment, both unavoidable in intense light fields. The effect could enable inversionless amplification of broadband radiation in many molecular gases, opening unusual opportunities for remote sensing.Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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