4.6um QCL arrays with different emitter number are fabricated and their device results are reported; an 8-emitter laser array, epi-down mounted on copper heat sink, outputs ~12 watts peak optical power @ 20us pulse width 4% Duty Cycle, and ~8 Watts with 100us pulse width 20% duty cycle, at 9.6A current, room temperature. A similar laser array with 7 emitters was measured to have a Visibility (V) greater than 0.9 in an external cavity. A 3D thermal model has been established to simulate QCL arrays, including all the epi-layers and packaging elements; suggestions to improve the performances further are proposed.
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