We report a low threshold current density InAs/AlGaSb superlattice quantum cascade laser operating at 14 μm. In order to reduce the threshold current density, InAs/AlGaSb superlattice structures providing large oscillator strength and fast carrier depopulation are used for the active layers. Observed threshold current density at 80 K is 0.92kA/cm2, which is about 5 times lower than that of the first InAs/AlSb quantum cascade laser reported earlier. This is among lowest threshold current density of quantum cascade lasers operating in the mid-infrared spectrum region.
|ジャーナル||Japanese Journal of Applied Physics, Part 2: Letters|
|出版ステータス||Published - 2004 7 1|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)