Abstract
The preparation by liquid phase epitaxy of laser‐quality Aly Ga1−y As/In0.49Ga0.51P/Aly Ga1−y As double‐heterostructure material is reported. The structure provided optical waveguiding and carrier confinement for y ≳ 0.6. Cleaved bars have shown laser action at ∼6200 Å, when optically pumped in the temperature range 77–130 K. The lasing threshold is 50% higher than for geometrically similar high‐quality Al0.5Ga0.5As/GaAs/Al0.5Ga0.5As laser material.