Abstract
Injectorless quantum-cascade (QC) lasers, for the first time comparable to conventional QC lasers, are presented. The samples are based on InP and the active region is designed as a four-level staircase, realised in the strain-compensated material system Ga0.4In0.6As/Al 0.56In0.44As. Low threshold current densities and a maximum operating temperature of 350 K have been achieved, due to an optimised design. At 77 K the wavelength is about 10 μm, while threshold current densities of 0.9 kA/cm2 have been observed, which compare well with those of conventional QC lasers in this wavelength region.
Original language | English |
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Pages (from-to) | 529-531 |
Number of pages | 3 |
Journal | Electronics Letters |
Volume | 41 |
Issue number | 9 |
DOIs | |
State | Published - 28 Apr 2005 |