Figure 3
From: Spectroscopic Study of Terahertz Generation in Mid-Infrared Quantum Cascade Lasers
Mid-IR peak power output (in watts) as a function of mid-IR pump frequencies ω1 and ω2.
The pump frequencies ω1 and ω2 are selected by the angle of two external diffraction gratings. Panels (a–c) show the peak power output of ω1 pump at pump currents of 2.3 A, 2.8 A and 3.3 A, respectively. Panels (d–f) show the peak power output of ω2 pump at pump currents of 2.3 A, 2.8 A and 3.3 A, respectively.
