Nonlinear energy deposition of filamentation with femtosecond Airy laser beams in water

2019 ◽  
Vol 33 (28) ◽  
pp. 1950339
Author(s):  
Qingwei Zeng ◽  
Lei Liu ◽  
Kejin Zhang ◽  
Taichang Gao ◽  
Ming Chen ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Energy Deposition ◽  
Spatial Dynamics ◽  
Beam Waist ◽  
Nonlinear Propagation ◽  
Laser Beams ◽  
Energy Increase ◽  
Deposited Energy ◽  
Temporal And Spatial ◽  
Nonlinear Energy

The nonlinear propagation of femtosecond Airy laser filaments in water is numerically investigated in this paper. We mainly consider the influences of confinement parameter, pulse duration and beam waist on the deposited energy of filaments. The values of confinement parameter are found to have a significant impact on the temporal and spatial dynamics of the pulse. The characteristics of energy deposition also differ widely for Airy beams with different confinement parameters. The less the confinement parameter, the more energy deposited by filamentation. However, the relative deposited energy evolves relatively small changes under different confinement parameters. We also found the longer pulse duration and longer beam waist are beneficial to the total deposited energy increase.

scholarly journals Numerical Investigation on the Influence of Water Vapor Ionization on the Dynamic and Energy Deposition of Femtosecond Ultraviolet Laser Filamentation in Air

2019 ◽  
Vol 9 (20) ◽  
pp. 4201
Author(s):  
Qingwei Zeng ◽  
Lei Liu ◽  
Kejin Zhang ◽  
Shuai Hu ◽  
Taichang Gao ◽  
...  
Keyword(s):  
Water Vapor ◽  
Energy Deposition ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Nonlinear Propagation ◽  
High Humidity ◽  
Atmospheric Conditions ◽  
Energy Increase ◽  
Influence Of Water ◽  
Vapor Ionization

The effects of water vapor ionization on the nonlinear propagation of femtosecond laser pulses with a 248 nm wavelength are numerically investigated in this paper. It is found that ionization of H2O molecules plays a significant role in air ionization, which seriously affects the dynamic and energy deposition of filamentation. The propagation of femtosecond pulses in air with different humidity levels are compared. The total number of electrons and total deposited pulse energy increase with the humidity increases. However, they tend to be saturated in high humidity conditions. Results presented here are conducive to characterizing the long-range propagation of filaments under atmospheric conditions.

Temporal and spatial dynamics of pulse production in India

2017 ◽  
Author(s):  
International Food Policy Research Institute (IFPRI)
Keyword(s):  
Spatial Dynamics ◽  
Temporal And Spatial ◽  
Pulse Production

scholarly journals Large-Scale Analysis of the Spatiotemporal Changes of Net Ecosystem Production in Hindu Kush Himalayan Region

2021 ◽  
Vol 13 (6) ◽  
pp. 1180
Author(s):  
Da Guo ◽  
Xiaoning Song ◽  
Ronghai Hu ◽  
Xinming Zhu ◽  
Yazhen Jiang ◽  
...  
Keyword(s):  
Large Scale ◽  
Net Primary Production ◽  
Carbon Sink ◽  
Carbon Sources ◽  
Spatial Dynamics ◽  
Tibet Plateau ◽  
Geostatistical Model ◽  
Hindu Kush ◽  
Temporal And Spatial ◽  
The Difference

The Hindu Kush Himalayan (HKH) region is one of the most ecologically vulnerable regions in the world. Several studies have been conducted on the dynamic changes of grassland in the HKH region, but few have considered grassland net ecosystem productivity (NEP). In this study, we quantitatively analyzed the temporal and spatial changes of NEP magnitude and the influence of climate factors on the HKH region from 2001 to 2018. The NEP magnitude was obtained by calculating the difference between the net primary production (NPP) estimated by the Carnegie–Ames Stanford Approach (CASA) model and the heterotrophic respiration (Rh) estimated by the geostatistical model. The results showed that the grassland ecosystem in the HKH region exhibited weak net carbon uptake with NEP values of 42.03 gC∙m−2∙yr−1, and the total net carbon sequestration was 0.077 Pg C. The distribution of NEP gradually increased from west to east, and in the Qinghai–Tibet Plateau, it gradually increased from northwest to southeast. The grassland carbon sources and sinks differed at different altitudes. The grassland was a carbon sink at 3000–5000 m, while grasslands below 3000 m and above 5000 m were carbon sources. Grassland NEP exhibited the strongest correlation with precipitation, and it had a lagging effect on precipitation. The correlation between NEP and the precipitation of the previous year was stronger than that of the current year. NEP was negatively correlated with temperature but not with solar radiation. The study of the temporal and spatial dynamics of NEP in the HKH region can provide a theoretical basis to help herders balance grazing and forage.

Temporal and spatial dynamics of arthropod groups in terrestrial subsurface habitats in central Portugal

Zoology ◽  
2021 ◽  
pp. 125931
Author(s):  
R.P. Eusébio ◽  
H. Enghoff ◽  
A. Solodovnikov ◽  
A. Michelsen ◽  
P. Barranco ◽  
...  
Keyword(s):  
Spatial Dynamics ◽  
Central Portugal ◽  
Temporal And Spatial ◽  
Terrestrial Subsurface

Temporal and spatial dynamics of watermelon gummy stem blight epidemics

2010 ◽  
Vol 128 (4) ◽  
pp. 473-482 ◽  
Author(s):  
Adalberto C. Café-Filho ◽  
Gil R. Santos ◽  
Francisco F. Laranjeira
Keyword(s):  
Spatial Dynamics ◽  
Stem Blight ◽  
Gummy Stem Blight ◽  
Temporal And Spatial
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