Stimulated-Raman-scattering-assisted superfluorescence enhancement from ionized nitrogen molecules in 800-nm femtosecond laser fields

Miao, Zhiming; Zhong, Xunqi; Zhang, Linlin; Wei, Zheng; Gao, Yunan; Liu, Yunquan; Jiang, Hongbing; Gong, Qihuang; Wu, Chengyin

doi:10.1103/physreva.98.033402

Cited by 16 publications

(12 citation statements)

References 39 publications

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“…The rapid nonexponential decay of the short-term gain is also inconsistent with the decay of population. Recently, Miao et al [36] observed similar short-term gain at 391 nm using a probe pulse spectrum that did not overlap 391 nm. Instead, they used an off-resonance probe pulse that overlapped another vibrational transition at 357 nm [X 2 + g (ν = 0) → B 2 + u (ν = 1)].…”

Section: Short-term Gainmentioning

confidence: 84%

Short- and long-term gain dynamics in N2+ air lasing

et al. 2019

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Air lasing in the nitrogen molecular ion is not well understood because the complex physics responsible for gain is interwoven with pulse propagation in an extreme environment. Here we use a short gas jet to limit the interaction length, thereby removing the propagation effects. We report on several mechanisms that contribute to the decay of gain in different conditions, and experimentally isolate two decay timescales: the decay of long-term gain due to collisional state mixing, and short-term gain that cannot be explained by population inversion. To test the former, we control the inelastic electron scattering rate by varying the gas concentration while keeping the propagation length fixed, and predict the change of the decay using a model of collisional state mixing. We show that the same mechanism causes the decay of rotational wave packets in the states of the ion. Finally, we simulate the complex modulations of gain due to rotational wave packets and the propagation of the probe pulse through the evolving rotationally excited and inverted medium.

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Section: Short-term Gainmentioning

confidence: 84%

Short- and long-term gain dynamics in N2+ air lasing

et al. 2019

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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%

“…Similar to the atomic air lasing, resonant excitation is involved in the N

_{2}^{+}

lasing. The resonant interaction between the light and nitrogen molecular ions greatly enhances the nonlinear optical responses, which provides opportunities for studying ultrafast nonlinear optics with molecular ions …”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

“…Very recently, the vibrational Raman scattering has been observed in N

_{2}^{+}

ions with the assistance of electronic resonances . Afterward, the crucial role of the electronic resonance on the enhancement of nonlinear optical effects is confirmed by carefully tuning the wavelength of the probe laser .…”

Section: Molecular Nitrogen Ion Lasingmentioning

confidence: 99%

“…This process ends up with the amplification of a seed field in the picosecond timescale. 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 .…”

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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Enhanced Coherent Emission from Ionized Nitrogen Molecules by Femtosecond Laser Pulses

Wei

Miao

Zhang

et al. 2019

J. Phys. Chem. Lett.

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The forward emission spectra were experimentally measured for ionized nitrogen molecules by an 800 nm pump laser and a delayed seed laser. It was found that emission lines around both 428 and 391 nm are greatly enhanced upon use of a 391 or 428 nm seed laser. The emission lines around 391 and 428 nm can be assigned to the rotational transitions of N2 + [B2Σu +(v′ = 0) → X2Σg +(v = 0)] and N2 + [B2Σu +(v′ = 0) → X2Σg +(v = 1)], respectively. They originate from seed-induced superfluorescence and resonant stimulated Raman scattering. The genetic algorithm was utilized to simulate the experimental observations and determine the relative population of B2Σu +(v′ = 0), X2Σg +(v = 1), and X2Σg +(v = 0). The result verifies that vibrational population inversion is achieved between B2Σu +(v′ = 0) and X2Σg +(v = 0) by the 800 nm pump laser. Our finding provides new insights into controlling the coherent emission of ionized nitrogen molecules, which has promising application in filamentation-based remote atmospheric sensing.

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Stimulated-Raman-scattering-assisted superfluorescence enhancement from ionized nitrogen molecules in 800-nm femtosecond laser fields

Cited by 16 publications

References 39 publications

Short- and long-term gain dynamics in N2+ air lasing

Short- and long-term gain dynamics in N2+ air lasing

Recent Advances in Air Lasing: A Perspective from Quantum Coherence

Enhanced Coherent Emission from Ionized Nitrogen Molecules by Femtosecond Laser Pulses

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