Performance Comparison of Optically Pumped Type-II Mid-Infrared Lasers (Briefing Charts)

TL;DRAbstract

We report a comparative study on the performance of three optically pumped type-II quantum well lasers with differing quantum well confinement. One of the active regions emphasized hole confinement another emphasized electron confinement while the third incorporated both electron and hole confinement. In all cases the wells were inserted in a thick In(x)Ga(1-x)As(y)Sb(1-y) waveguide/absorber region. The lasing wavelengths at 84 K were 2.26 um 3.44 um and 2.37 um respectively. The maximum peak output powers and differential quantum efficiencies Eta, at 84 K were similar for the hole well and W lasers (= 13 W, Eta =O.55) but significantly reduced in the electron well only laser (2.3 W, Eta = 0.14). Waveguide loss measurements via the traditional quantum efficiency vs cavity length method and by a Hakki-Paoli method revealed that all three lasers had low waveguide loss that either increased slowly or not at all with increasing temperature. However the laser's internal efficiency Etai, sho

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