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Photo of a femtosecond filament in air for generating nano- and microscale structures on a spherical Al surface by laser pulses with energy of 3.6 mJ and duration of 50 fs. The filament starts about 89 cm and ends around 104 cm from the lens, and the laser propagates from right to left.
The photos of the Al spherical surface before and after laser filament processing. The arrow marked in the photo indicates incident direction of the laser filament.
SEM images of an intrinsic Al spherical surface before filament treatment (a) and after the filament processing (b)-(d).
Wavelength dependent reflectance of Al spherical surface before and after femtosecond laser filament processing.
Typical SEM images of four filament-processed samples that have been fabricated at 91 cm (a), 93 cm (b), 97 cm (c), and 99 cm (d) from the lens, respectively.
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