We present the results of low‐temperature photoluminescence and stimulated emission experiments performed on a CdTe/Hg0.45Cd0.55Te/Hg0.67Cd0.33Te multiquantum well separate confinement heterostructure grown by molecular beam epitaxy. The photoluminescence results suggest that because of the growth conditions, there is a strong interdiffusion in the multiquantum well region. Pulsed stimulated emission was observed from this structure up to 77 K.