Abstract

We demonstrated a wide CW wavelength tuning range of 18 cm-1 for an epi-up mounted distributed feedback (DFB) quantum cascade laser (QCL) around 4.5 m, via current change. The wavelength tuning coefficient of an epi-up mounted DFB QCL is about 2.2 times of that of an epi-down mounted one. The 3dB modulation bandwidths of an epi-up and an epi-down mounted DFB QCLs are 15 kHz and 400 kHz, respectively.

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