Correlation of mid-infrared quantum-cascade laser performance with laser design parameters
2012
Several different quantum-cascade (QC) laser designs spanning the wavelength range between ~3.8 and ~4.8 microns
were grown, and devices were fabricated and tested. The active regions of these designs consist of strained layers of
(In,Ga)As and (In,Al)As. For several of these designs, we varied design parameters including injector doping, sectioncoupling
strength, and the number of QC laser periods. Lasers were tested near room temperature under both quasi-cw
and low-duty-cycle conditions. Device performance is compared with theoretical expectations, and conclusions are
reached on the relative merit of various design modifications.
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