Abstract
It is shown that for an average output power of 60 mW, the spectral density of low-frequency intensity fluctuations in single-mode semiconductor lasers lies in the interval 6 × 10-17 — 10-15 W2 Hz-1. This fluctuation level is caused by the presence of subthreshold longitudinal modes and mode hopping, leading to the emergence of a noticeable 1/f component in their spectrum.
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