ТГЦ квантово-каскадные лазеры на основе резонансного двухфотонного дизайна

Abstract

An optimized resonant two-photon design was developed using the balanced equation method and grown by MOVPE technique with 10 μm active region thickness. The fabricated QCLs with Au-Au double metal waveguide based on grown structures show an excellent growth robustness, as all MOVPE-grown structures (6 wafers) demonstrate laser generation. The maximum operation temperatures of fabricated lasers are equal to 90-100 K. The light-current characteristics have two shoulders in the experimental curves (see Fig. 1), which corresponds to the two-photon nature of the proposed design. The fabricated QCLs have a lasing frequency of 3.6 THz (see Fig. 2), which completely coincides with the target frequency. At high currents the generation shifts to 3.7 THz. This effect can be explained by increasing the energy separation between lasing levels (the first THz photon) at high electric fields.