Broad tunability in the mid-IR (~3-12 μm) is desirable for a number of applications. We have built a number of External
Cavity quantum cascade Lasers (ECqcLTM) that maximize tuning range from the quantum cascade chip. As much as 525
cm-1 of pulsed and 121 cm-1 of cw, mode hop-free tuning has been obtained. Various mechanisms for the broadening of
the gain of the QC chip are considered.
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