Figure 5:
(a) Band diagram of one period of a SWDP design supporting clean three-level system with mixed barriers: Al0.55Ga0.45As injection barrier (nominally pure AlAs barrier) and Al0.15Ga0.85As radiative and intrawell barriers. (b) Current curves as a function of voltage at low, around maximum operating, and room temperatures. An arrow points to a slight change in the curves, assumingly from residual fluctuations. (c) Pulsed light–current and spectrum (inset) measurements of the SWDP design with mixed barriers. The measured maximum operating (lasing) temperature is ∼170 K and emission frequency ∼2.43 THz, as indicated. Ref. [21].