Figure 7
From: Femtosecond laser filament induced condensation and precipitation in a cloud chamber

Close up shots of snow formation on the cold plate (a) background (b) with a fan blowing for 30 min. The cloud chamber was pre-cooled for 30 min. before the fan was turned on. The scene of snow formation on the whole cold plate without (a) and with fan (b) at the end was shown in the insets correspondingly.