Measured far-field intensity distributions for the substrate emitting device. (a) 2D far-field intensity distribution under pulsed driving current of 33.0 A. (b) 53.3 A. (c) Measured 1D far-fields for θx correspond to (a) and (b) for comparison. Simulated results of TM00, TM03, and TM06 are depicted using dotted lines (d) 1D far-fields for θy.