the National Natural Science Foundation of China (Grant Nos. 11274185 and 61137001);the Natural Science Foundation of Tianjin City (No. 16JCQNJC01900).
A peculiar and regular diffraction pattern is recorded while using either a color or a monochrome charge-coupled device (CCD) camera to capture the image of the micro air plasma produced by femtosecond laser pulses. T...