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In this paper, a mini-staged multi-stacked quantum cascade laser structure with a designed wavelength of 4.7 µm is presented. By introducing five 0.5 µm thick high thermal conductivity InP interbuffer layers, the 60-stages active region core of the quantum cascade laser is divided into six equal parts. Based on simulation, this kind of quantum cascade laser with a 10 µm ridge width gives nearly circular two-dimensional far-field distribution (FWHM = 32.8° × 29°) and good beam quality parameters M2 = 1.32 × 1.31 in the fast axis (growth direction) and the slow axis (lateral direction). Due to the enhancement of lateral heat extraction through the interbuffer layers, compared to the conventional structure, a decrease of about 5–6% for the maximum temperature in the active region core of the mini-staged multi-stacked quantum cascade laser with indium-surrounded and gold-electroplated packaging profiles is obtained at all possible dissipated electrical power levels.
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