Pulse characterization during femtosecond laser filamentation in air by two-photon fluorescence measurement

Liu, Y.; Wen, Qi; Xu, Siyuan; Liu, W.; Chin, See Leang

doi:10.1007/s00340-011-4480-9

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…In situ methods have also been presented, such as two-photon fluorescence [138,139], Raman scattering [140], and transient-grating cross-correlation frequency-resolved optical gating (TG-FROG) [141]. Specifically, the pulse duration and chirp parameters along the filament can be accessed by two-photon fluorescence.…”

Section: Laser Pulse In Filamentmentioning

confidence: 99%

Sensing with Femtosecond Laser Filamentation

Qian

Guo

et al. 2022

Sensors

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Femtosecond laser filamentation is a unique nonlinear optical phenomenon when high-power ultrafast laser propagation in all transparent optical media. During filamentation in the atmosphere, the ultrastrong field of 1013–1014 W/cm2 with a large distance ranging from meter to kilometers can effectively ionize, break, and excite the molecules and fragments, resulting in characteristic fingerprint emissions, which provide a great opportunity for investigating strong-field molecules interaction in complicated environments, especially remote sensing. Additionally, the ultrastrong intensity inside the filament can damage almost all the detectors and ignite various intricate higher order nonlinear optical effects. These extreme physical conditions and complicated phenomena make the sensing and controlling of filamentation challenging. This paper mainly focuses on recent research advances in sensing with femtosecond laser filamentation, including fundamental physics, sensing and manipulating methods, typical filament-based sensing techniques and application scenarios, opportunities, and challenges toward the filament-based remote sensing under different complicated conditions.

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Section: Laser Pulse In Filamentmentioning

confidence: 99%

Sensing with Femtosecond Laser Filamentation

Qian

Guo

et al. 2022

Sensors

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“…Then we apply quantum Monte Carlo (QMC) method to study a parameters' regime without a sign problem. [21,22,[25][26][27][28][29] We find that the system is a Mott insulator for small next-nearest-neighbor interchain hopping t p and a quantum phase transition to a superfluid phase is driven by increasing t p . By performing a scaling analysis, the critical t c p is precisely determined.…”

Section: Introductionmentioning

confidence: 99%

Quantum Monte Carlo study of hard-core bosons in Creutz ladder with zero flux

Lin¹,

Hao²,

Guo

2018

Chinese Phys. B

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The quantum phase of hard-core bosons in Creutz ladder with zero flux is studied. For a specific regime of the parameters (t x = t p ,t y < 0), the exact ground-state is found analytically, which is a dimerized insulator with one electron bound in each rung of the ladder. For the case t x ,t y ,t p > 0, the system is exactly studied using quantum Monte Carlo (QMC) method without a sign problem. It is found that the system is a Mott insulator for small t p and a quantum phase transition to a superfluid phase is driven by increasing t p . The critical t c p is determined precisely by a scaling analysis. Since it is possible that the Creutz ladder is realized experimentally, the theoretical results are interesting to the cold-atom experiments.

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“…Conventional air lasing combines self-focusing of a short, high power laser pulse with optical breakdown of air molecules. As the lasing medium is pumped, the frequency of the pump beam changes, and the duration of the pump pulse varies with time in a complex manner [18][19][20]. In addition, the spatial profile of the pump beam is time-dependent and, if the polarization is not exactly linear, the polarization of the pump beam is also time-dependent [21,22].…”

mentioning

confidence: 99%

Testing the Role of Recollision in N2+ Air Lasing

Britton

Laferrière

et al. 2018

Phys. Rev. Lett.

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It has been known for many years that during filamentation of femtosecond light pulses in air, gain is observed on the B to X transition in N_{2}^{+}. While the gain mechanism remains unclear, it has been proposed that recollision, a process that is fundamental to much of strong field science, is critical for establishing gain. We probe this hypothesis by directly comparing the influence of the ellipticity of the pump light on gain in air filaments. Then, we decouple filamentation from gain by measuring the gain in a thin gas jet that we also use for high harmonic generation. The latter allows us to compare the dependence of the gain on the ellipticity of the pump with the dependence of the high harmonic signal on the ellipticity of the fundamental. We find that gain and harmonic generation have very different behavior in both filaments and in the jet. In fact, in a jet we even measure gain with circular polarization. Thus, we establish that recollision does not play a significant role in creating the inversion.

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Pulse characterization during femtosecond laser filamentation in air by two-photon fluorescence measurement

Cited by 6 publications

References 43 publications

Sensing with Femtosecond Laser Filamentation

Sensing with Femtosecond Laser Filamentation

Quantum Monte Carlo study of hard-core bosons in Creutz ladder with zero flux

Testing the Role of Recollision in N2+ Air Lasing

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