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- W4214647515 abstract "Propagation of intense femtosecond pulses through atmosphere leads to the formation of an ionized plasma channel initiated by the dramatic self-collapse of the optical pulse due to Kerr mediated self-focusing which leads to an exponential increase in on-axis intensity. The balancing interplay of the intensity dependent Kerr self-focusing, and plasma induced defocusing, leads to a soliton like propagation of energy confined within a periodic plasma channel which is called a filament1. The onset of this phenomenon can be accelerated by using focusing optics which minimizes the distance and pulse energy requirement at which the filament generation is initiated. The generation of filament allows us to clamp the beam spot size and intensity over long distance of propagation which is very desirable for LIDAR applications. Any spatial or temporal distortion of the focused femtosecond laser beam due to the focusing elements has serious implications on the shape and intensity of the filament produced. Here, we present the results of our study on the effects of aberrations associated with different focusing elements on the nature of filament generated. We used both transmitting optics (achromat, thin and thick plano-convex lens) and Reflective optics (Off-axis parabolic mirror (OAPM)). Of these focusing elements the OAPM has the least aberrations (Spherical, chromatic and GDD induced) and thick lens has the most. We measured the atomic emissions from the filament and the supercontinuum generated using a USB spectrometer and the spatial extent using a CCD and DSLR camera. Based on the spectral measurements we estimated the peak filament intensities2 and GDD induced by each optical element. The surprising observation was that the thick lens with the most aberrations performed on par with the OAPM to produce the most intense filament. The thick lens had another advantage where the spatial extent of the filament (length and width) was also large compared to that of the OAPM. In applications like LIBS or white light LIDAR where one looks for strong emissions from the filament (large emission profile), the filament generated from the thick lens becomes highly desirable." @default.
- W4214647515 created "2022-03-02" @default.
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- W4214647515 date "2020-12-06" @default.
- W4214647515 modified "2023-09-30" @default.
- W4214647515 title "Effect of Aberrations in Focusing Elements on Femtosecond Filaments" @default.
- W4214647515 doi "https://doi.org/10.1109/icops37625.2020.9717634" @default.
- W4214647515 hasPublicationYear "2020" @default.
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