Figure 3: Time domain inter-mode beat note of the 6-mm long terahertz QCL.
From: Homogeneous spectral spanning of terahertz semiconductor lasers with radio frequency modulation
(a) Time trace of the inter-mode beat note signal recorded at 900 mA using a high-speed oscilloscope. The inset shows the zoomed-in figure with a time span of 8 ns. (b,c) Are eye diagrams constructed from the time traces measured at 900 and 1100 mA, respectively. In (b,c) the horizontal axes represent a time span of 160 ps.
