Intersubband Raman laser from GalnAs/AllnAs double quantum wells

摘要

We demonstrate optically pumped GalnAs/AllnAs based intersubband lasers operating at a wavelength of ～5.5 μm applying a simple three-level design. Using a subnanosecond long pulsed excitation laser tunable over the linewidth of the transition from the first level to the third level E_(13), Raman shift in the lasing spectra was observed. Lasing output power of ~ 14 W and an internal conversion efficiency between pump and intersubband laser of ～1.3% at 70 K is observed.