Abstract
The effect of spectral inhomogeneity of the gain medium on the Schawlow-Townes linewidth of a laser is demonstrated. This is done by measuring the linewidth of a HeXe 3.51 μm laser as a function of the ratio of the homogeneous linewidth and the Doppler linewidth. Effects of inhomogeneity are observed when the cavity loss rate becomes of the order of the gain bandwidth. Both theory and experiment indicate that the quantum-limited laser linewidth is not solely determined by the homogeneous component of the gain bandwidth but by the total gain bandwidth.
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