Abstract
The frequency noise power spectral density (FNPSD) of a room-temperature distributed-feedback quantum cascade laser (DFB-QCL) was calculated by performing voltage noise measurements directly at the laser terminals. The integration of the FNPSD allowed estimating the linewidth of the laser both free-running and under optical feedback by using the β-line method. The comparison with the recently reported linewidth measured on the same device by laser self-mixing interferometry is in excellent quantitative agreement, demonstrating the strong coupling between frequency and voltage fluctuation in QCL laser in the low frequency range.
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