Fig. 4
From: Continuous-wave highly-efficient low-divergence terahertz wire lasers
Far-field intensity patterns. Far-field emission patterns measured at 20 K while driving the devices in pulsed mode with 2% duty cycle, for wire lasers having different extraction parameters: a η = 0.90, b η = 0.95, c η = 1.00, d η = 1.05, e η = 1.10. All the measurements were performed scanning a pyroelectric detector at a distance of ~8 cm from the device lateral surface. The origin (0,0) of the plots is coincident with the origin of the x–y–z reference system of Fig. 2a. The scanned area is 12×12 cm
