High performance injectorless quantum-cascade lasers |
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Authors: | Friedrich A. Boehm G. Amann M.-C. Scarpa G. |
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Affiliation: | Walter-Schottky Inst., Tech. Univ. Muenchen, Garching, Germany; |
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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 Ga/sub 0.4/In/sub 0.6/As/Al/sub 0.56/In/sub 0.44/As. 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 /spl mu/m, while threshold current densities of 0.9 kA/cm/sup 2/ have been observed, which compare well with those of conventional QC lasers in this wavelength region. |
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