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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 P-line method. The comparison with the recently reported...
Self-mixing based on Vertical Cavity Surface Emitting Lasers (VCSEL), offers a compact and low-cost coherent detection scheme for interferometric accessible measurements. The direct detection of the junction voltage change simplifies the setup further by adding detector-less capability. The linewidth of a NIR VCSEL was estimated by using a method based on the statistical analysis of the Laser Self-Mixing...
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