High-power (λ∼9μm) quantum cascade lasers

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High-power quantum cascade lasers emitting at λ>9μm are demonstrated. Accurate control of layer thickness and interfaces is evidenced by x-ray diffraction. Excellent peak power for uncoated lasers, up to 3.5 W per facet for a 25 μm emitter width, is obtained at 300 K for 75 period structures. The threshold current density at 300 K is only 1.4 kA/cm 2. From 300 to 425 K, the laser exhibits a characteristic temperature, T0, of 167 K. Over 150 mW of average power is measured per facet for a duty cycle of 6%. Simulation of the average power output reveals a thermal resistance of 12 K/W for epilayer-up mounted ridges.

Original languageEnglish (US)
Pages (from-to)4091-4093
Number of pages3
JournalApplied Physics Letters
Issue number22
StatePublished - Jun 3 2002

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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