Figure 2

(a) Real-color images of discharges generated along the laser plasma channel in air with applied voltages ranging from 0 kV to 50 kV, and (b–d) the 2D flow fields of the ionic wind at the voltages of 10 kV, 35 kV, and 50 kV, respectively. Clear discharges guided by laser were assigned by the arrows. The recording parameters of the camera for (b–d) are S = 1/50 s, F = 4, and ISO = 25600 (b) S = 1/200 s, F = 4, and ISO = 25600 (c) S = 1/500 s, F = 4, and ISO = 25600 (d), respectively.