The designing construction of Nd∶glass laser cavity is double flashlamp pumped,symmetrical,close coupling and unfocused.The cooling channels of Nd∶glass rod are separated from water-cooling channels of flashlamp independently.Through 10s experiment,laser beam patterns have been measured at 10Hz repetition rate and 250μs pulse duration of two flashlamps for 900W pump power in heat capacity operation and general water-cooling operation successively.16 facular pictures have been collected from total 100 facula...