During the last decade, the development of Mid-IR (4～11 μm) Quantum Cascade Lasers (QCLs) has shown substantial progress toward to the commercial availability of such devices. In developing newly high performance QCLs, we focused on high-power QCLs for bio-medical applications, and developed a Fabry-Perot (FP-) type QCL emitting at the 6-μm (～1700-cm‒1) wavelength range. This wavelength range is expected to be absorbed by organic matter. The active region structure of QCL is based on InGaAs/InAlAs super lattice grown by MOCVD. High refl ection coated FP-QCL chip is mounted episide down on the Cu heat-sink. The average output power exceeds 1.1-W in pulsed operation (dutycycle 50%) at 20 ℃. High-power QCLs show good potential for less-invasive and selective laser surgery.
