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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Coherent Detection of Terahertz Waves with a Gas Plasma
摘要： We demonstrate an alternative coherent detection technique via terahertz induced second-harmonic (TISH) in a laser-induced plasma for terahertz waves. In this method, the probe beam requires neither high voltage bias nor optically field bias.
关键词： gas plasma,terahertz detection,Ultrafast nonlinear optics
更新于2025-09-23 15:22:29
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Nonlinear energy deposition of filamentation with femtosecond Airy laser beams in water
摘要： The nonlinear propagation of femtosecond Airy laser ?laments in water is numerically investigated in this paper. We mainly consider the in?uences of con?nement parameter, pulse duration and beam waist on the deposited energy of ?laments. The values of con?nement parameter are found to have a signi?cant impact on the temporal and spatial dynamics of the pulse. The characteristics of energy deposition also di?er widely for Airy beams with di?erent con?nement parameters. The less the con?nement parameter, the more energy deposited by ?lamentation. However, the relative deposited energy evolves relatively small changes under di?erent con?nement parameters. We also found the longer pulse duration and longer beam waist are bene?cial to the total deposited energy increase.
关键词： self-focusing,Airy beams,energy deposition,Ultrafast nonlinear optics
更新于2025-09-19 17:13:59
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Numerical Investigation on the Influence of Water Vapor Ionization on the Dynamic and Energy Deposition of Femtosecond Ultraviolet Laser Filamentation in Air
摘要： The e?ects 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 signi?cant role in air ionization, which seriously a?ects the dynamic and energy deposition of ?lamentation. The propagation of femtosecond pulses in air with di?erent 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 ?laments under atmospheric conditions.
关键词： multiphoton absorption,atmospheric propagation,self-focusing,water vapor,ultrafast nonlinear optics
更新于2025-09-16 10:30:52