High energy AlxGa1−xAs (0⩽x⩽0.1) quantum-well heterostructure laser operation

Abstract
Besides high pressure or bulk crystal composition change, a size‐determined direct‐indirect transition can be obtained in an AlxGa1−xAs (0⩽x⩽0.1) quantum‐well heterostructure (QWH), in fact, at higher energy (E∼2.05 eV) than in bulk AlxGa1−xAs (∼1.98 eV). Laser operation is demonstrated at 6700–6500 Å on a QWH grown by metalorganic chemical vapor deposition (MOCVD).