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.
Simple Single-Section Diode Frequency Combs
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abstract
Frequency combs, broadband light sources whose spectra consist of coherent, discrete modes, have become essential in many fields. Miniaturizing frequency combs would be a significant advance in these fields, enabling the deployment of frequency-comb based devices for diverse measurement and spectroscopy applications. We demonstrate diode-laser based frequency comb generators. These laser diodes are simple, electrically pumped, inexpensive and readily manufactured. Each chip contains several dozen diode-laser combs. We measure the time-domain output of a diode frequency comb to reveal the underlying frequency dynamics responsible for the comb spectrum, conduct dual comb spectroscopy of a molecular gas with two devices on the same chip, and demonstrate that these combs can be battery powered.
fields
physics.optics 1years
2025 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
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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.