Broad-beatnote semiconductor laser states, previously viewed as incoherent, are shown to keep evenly spaced spectral lines with a common fluctuating phase, and are named liquid combs.
Yu, et al., Silicon-chip-based mid-infrared dual-comb spectroscopy
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Liquid combs: broadband light with equidistance and without stability
Broad-beatnote semiconductor laser states, previously viewed as incoherent, are shown to keep evenly spaced spectral lines with a common fluctuating phase, and are named liquid combs.