Low-threshold and high power λ∼9.0 μm quantum cascade lasers operating at room temperature

Matlis, A.; Slivken, S.; Tahraoui, A.; Taharaoui, A.; Luo, K. J.; Luo, K.J.; Diaz, J.; Wu, Z.; Rybaltowski, A.; Jelen, C.; Razeghi, M.
September 2000
Applied Physics Letters;9/18/2000, Vol. 77 Issue 12
Academic Journal
We report a low threshold current density and high power for λ∼9 μmAlInAs/GaInAs quantum cascade lasers operating at room temperature. The threshold current density is 1.95 kA/cm2 at 300 K and 0.61 kA/cm2 at 80 K for 5 μs pulses at 200 Hz repetition rate. The peak output power is 700 mW at room temperature and 1.3 W at 80 K per two facets for cavity length is 3 mm with a stripe width of 20 μm. The characteristic temperature T[sub 0] is 185 °C. The slope efficiency is 450 and 800 mW/A at 300 and 80 K, respectively. In continuous wave operation, the output power is more than 150 mW at 80 K and 25 mW at 140 K. This high performance was achieved by improving the material growth and processing technology. © 2000 American Institute of Physics.


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