Extended Data Fig. 6: Far-field beam profiles and line-intensity profiles of electrically-driven perovskite lasers, measured at 5 cm distance from the device.
From: Electrically driven lasing from a dual-cavity perovskite device
a, Far-field beam profile and b, the corresponding line-intensity profile (blue curve, magnified by 40 times) measured at 85 A cm−2 (below threshold) (the red curve represents the gaussian fit). c, Far-field beam profile and d, the corresponding line-intensity profile (blue curve) measured at 280 A cm−2 (above threshold) (the red curve represents the gaussian fit). The scale bars in a and c: 1 mm. The measurements were performed at room temperature in air (temperature: ~22 °C, relative humidity: ~50%). The FHWMs of the beam profiles below and above the threshold are 2.52 mm and 1.18 mm, respectively.
