High power quantum cascade lasers operating at λ≃87 and 130μm

We report high power quantum cascade lasers operating above liquid nitrogen temperature at $\lambda \simeq 87$ and $130\mu \mathrm{m}$ based on a bound-to-continuum transition. For $\lambda \simeq 87\mu \mathrm{m}$ , $56\mathrm{mW}$ peak power in pulsed operation and $50\mathrm{mW}$ continuous wave operation at $10\mathrm{K}$ are demonstrated. At $\lambda \simeq 130\mu \mathrm{m}$ , a peak power of $50\mathrm{mW}$ was achieved and devices operated in continuous wave reached a maximum temperature of $53\mathrm{K}$ with an optical power of $11.5\mathrm{mW}$ at $T=10\mathrm{K}$ . Lifetimes are extracted from the scaling of the transport and laser parameters as a function of size using a simple rate equation model.