Abstract
It is theoretically shown that the spectrum of a frequency mode-locked laser with an intracavity dielectric plate, which modulates the cavity axial mode resonances, can undergo a kind of metal-insulator transition analogous to that encountered in the incommensurate Harper model of solid-state physics. The transition should be observable as a rather abrupt spectral broadening of the laser emission, accompanied by a transition from exponential to Gaussian spectral localization, as the modulation depth is increased above a threshold value.
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