High-performance quantum cascade lasers (λ∼11 μm) operating at high temperature (T >=425 K)

Tahraoui, A.; Matlis, A.; Slivken, S.; Diaz, J.; Razeghi, M.
January 2001
Applied Physics Letters;1/22/2001, Vol. 78 Issue 4, p416
Academic Journal
We report record-low threshold current density and high output power for λ∼11 μm Al[sub 0.48]In[sub 0.52]As/Ga[sub 0.47]In[sub 0.53]As quantum cascade lasers operating up to 425 K. The threshold current density is 1.1, 3.83, and 7.08 kA/cm[sup 2] at 80, 300, and 425 K, respectively, for 5 μs pulses at a 200 Hz repetition rate. The cavity length is 3 mm with a stripe width of 20 μm. The maximum peak output power per facet is 1 W at 80 K, 0.5 W at 300 K, and more than 75 mW at 425 K. The characteristic temperature of these lasers is 174 K between 80 and 300 K and 218 K in the range of 300-425 K.


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