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- W4385576345 abstract "In this work, sub-ppb aerosol detection is achieved by femtosecond laser filament with a single pulse energy of 4 mJ at a distance of 30 m. A concave mirror with an open aperture of 41.4 cm is employed in an off-axis optical system to focus the femtosecond laser beam and collect the fluorescence of NaCl aerosol. The simulation and experimental results show that the astigmatism can be greatly reduced when femtosecond laser beam is incident non-symmetrically on the concave mirror. Compared with the case that femtosecond laser strikes at the center of the concave mirror, the intensity of acoustic signal emitted from the optical filament is increased by 69.5 times, and the detection of limit of sodium element in aerosol is reduced by 86%, which is down to 0.32 ppb. The improved excitation scheme in this work utilizes the nonsymmetrical beam spot on the concave mirror to compensate the non-symmetry induced by the off-axis setup, reducing the astigmatism of the focusing laser beam and decreasing the sodium chloride aerosol’s detection of limit." @default.
- W4385576345 created "2023-08-05" @default.
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- W4385576345 date "2023-08-10" @default.
- W4385576345 modified "2023-09-25" @default.
- W4385576345 title "Sub-ppb aerosol detection at a distance of 30 meters by millijoule femtosecond laser pulse filamentation in air" @default.
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- W4385576345 doi "https://doi.org/10.1364/oe.498885" @default.
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