Abstract
Room‐temperature low‐current‐threshold broad‐area Fabry‐Perot AlxGa1−xAs/AlyGa1−y As double‐heterostructure (DH) lasers have been prepared by molecular‐beam epitaxy (MBE) covering the lasing emission wavelength from 8900 to 7200 Å (infrared to visible). In this emission range, the averaged pulsed current threshold densities Jth are as low as those obtained by liquid‐phase epitaxy (LPE). At ∼8200 Å, the wavelength at which DH lasers have also been prepared by metalorganic chemical‐vapor deposition (MO‐CVD), the Jth ’s of the MBE grown lasers are lower.