Role of rotational coherence in femtosecond-pulse-driven nitrogen ion lasing

Xie, Hongqiang; Lei, Hongbin; Liu, Guihua; Zhang, Qian; Wang, Xiaowei; Zhao, Jianlin; Chen, Zhiming; Yao, Jinping; Cheng, Ya; Zhao, Zengxiu

doi:10.1103/physrevresearch.2.023329

Cited by 26 publications

(10 citation statements)

References 32 publications

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“…For example, molecular constants of D + 2 has been determined in very high precision by the strong-field Fourier transform spectroscopy, in which the time evolution of the rovibrational wave packet of D + 2 created upon the ionization of D 2 is monitored [21]. Moreover, the effects of the rotational excitation in the molecular ion has been examined in the N + 2 lasing [22][23][24][25][26][27][28][29][30]. On the other hand, the mechanism of the creation of the RWP of the molecular ion is not clarified so far.…”

Section: Introductionmentioning

confidence: 99%

Rotational wave packet of NO⁺ created upon strong-field ionization of NO

Fukahori,

Hasegawa

2023

J. Phys. B: At. Mol. Opt. Phys.

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We theoretically investigate the creation of the rotational wave packet in molecular ions upon the strong-field ionization of diatomic molecules by a femtosecond laser pulse. The rotational excitation of molecular cation is ascribed to the dependence of the strong-field ionization probability on the orientation angle of the molecular axis with respect to the laser polarization direction. By extending the molecular strong-field approximation (MO-SFA) theory, we calculate the rovibrational state distribution of the ground electronic X1Σ+ state of NO+ after the ionization of NO in the electronic ground X2Π1/2 state. We also show that the extent of the rotational excitation of NO+ is enhanced by the stimulated impulsive Raman processes both in neutral NO and in NO+ cation. The resultant time evolution of the rotational wave packet of NO+ is in good agreement with the delay dependent NO2+ yield recorded experimentally in our previous pump-probe study.

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Section: Introductionmentioning

confidence: 99%

Rotational wave packet of NO⁺ created upon strong-field ionization of NO

Fukahori,

Hasegawa

2023

J. Phys. B: At. Mol. Opt. Phys.

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“…In 1987, Shore et al [6] predicted the highorder harmonic generation (HHG) and it was experimentally confirmed by McPherson et al [7] In the past few decades, the investigation of these nonlinear phenomena had made great progresses, which can be used to not only detect the microscopic particle dynamics process but also reveal the structure information of matter in the strong-field community. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] The theoretical study of strong-field dynamics can be traced back to the theory proposed by Keldysh, [26,27] Faisal, [28] and Reiss [29] (often called as KFR theory), which is widely used to explain experimental phenomena. Based on KFR theory, the various theoretical models considering different effects were developed, such as the well-known strongfield approximation (SFA) method.…”

Section: Introductionmentioning

confidence: 99%

Review on typical applications and computational optimizations based on semiclassical methods in strong-field physics

Huo

Yang

Dong³

et al. 2022

Chinese Phys. B

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The semiclassical method based on Feynman’s path-integral is in favor of uncovering the quantum tunneling effect, the classical trajectory description of the electron, and the quantum phase information, which can present an intuitive and transparent physical image of electron’s propagation in comparison with the ab initio time-dependent Schrödinger equation. In this review, we introduce the basic theoretical concepts and development of several semiclassical methods as well as some of their applications in strong-field physics. Special emphasis is placed on extracting time delay on attosecond scale by the combination of the semiclassical method with phase of phase method. Hundreds of millions of trajectories are generally adopted to obtain a relatively high-resolution photoelectron spectrum, which would take a large amount of time. Here we also introduce several optimization approaches of the semiclassical method to overcome the time-consuming problem of violence calculation.

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“…Recent advances in the study on the interaction of ultrashort intense laser pulses with gaseous media have revealed that atmospheric molecules such as N 2 and O 2 can act as nonlinear gain media in air lasing [1][2][3][4][5][6][7][8][9][10][11][12]. These air lasers are found to have a variety of promising applications such as remote sensing and standoff spectroscopy [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Laser Driven Fluorescence Emission in a Nitrogen Gas Jet at 100 MHz Repetition Rate

Zhang,

Hua,

et al. 2021

Preprint

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We report the fluorescence emission which is driven by femtosecond laser pulses with a repetition rate of 100 MHz and a center wavelength of 1040 nm in a nitrogen gas jet. The experiment is performed in a femtosecond enhancement cavity coupled with high repetition rate laser for the first time to the best of our knowledge. In contrast to previous observation at low repetition rate with a nitrogen gas jet, where the 391 nm radiation was observed but the 337 nm emission was missing, the 337 nm emission is 3 times stronger than the 391 nm emission in our experiment. By examining the dependence of the radiation intensity on the flow rate of the nitrogen gas and the polarization of the pump pulse, the formation mechanism of the N2(C 3 Πu) triplet excited state, i.e., the upper state of the 337 nm emission, is investigated. We attribute the main excitation process to the inelastic collision excitation process, and exclude the possibility of the dissociative recombination as the dominate pathway. The role of the steady state plasma that is generated under our experimental conditions is also discussed.

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Role of rotational coherence in femtosecond-pulse-driven nitrogen ion lasing

Cited by 26 publications

References 32 publications

Rotational wave packet of NO⁺ created upon strong-field ionization of NO

Rotational wave packet of NO⁺ created upon strong-field ionization of NO

Review on typical applications and computational optimizations based on semiclassical methods in strong-field physics

Laser Driven Fluorescence Emission in a Nitrogen Gas Jet at 100 MHz Repetition Rate

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Role of rotational coherence in femtosecond-pulse-driven nitrogen ion lasing

Cited by 26 publications

References 32 publications

Rotational wave packet of NO+ created upon strong-field ionization of NO

Rotational wave packet of NO+ created upon strong-field ionization of NO

Review on typical applications and computational optimizations based on semiclassical methods in strong-field physics

Laser Driven Fluorescence Emission in a Nitrogen Gas Jet at 100 MHz Repetition Rate

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Rotational wave packet of NO⁺ created upon strong-field ionization of NO

Rotational wave packet of NO⁺ created upon strong-field ionization of NO