Abstract
We report the fabrication and characterizations of integrated distributed Bragg reflector (DBR) thermally tunable buriedheterstructure (BH) quantum-cascade-lasers (QCLs) emitting at λ ~ 4.7 μm. We implemented a special device bonding technique utilizing two submount heatsinks that allow us to separately control the temperatures on the gain and DBR grating sections, respectively. With a thermoelectric (TE) cooler dedicated for the grating section, a tuning range of 65 nm, equivalently 29.831 cm -1 , was achieved while the gain section was maintained at 293K under pulsed mode operation. This corresponds to a tuning efficiency of 0.0325 nm/mA. We also established a 2D thermal model to simulate the temperature profiles and the heat flows within two sections as a function of TE cooler and gain-section temperatures. The thermal response time as the TE cooler temperature changed was also investigated.
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