Abstract
We present large-area, edge-emitting, photonic-crystal (PC) distributed-feedback (DFB) quantum cascade lasers (QCLs) emitting at λ∼7.6μm and operating up to a heat sink temperature of 80°C. The lasers use the anticrossing of index- and Bragg-guided dispersions of rectangular lattice to control the optical mode in the wafer plane. Single-mode operation with a high signal-to-noise ratio of about 20dB and narrow beam divergence of 6.2° was obtained. A high peak power of 630mW at 20°C and still more than 160mW at 60°C was observed. Such a high performance single-mode device is very important to expand the potential applications in the long-wave infrared range.
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