16 Mar 2020
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Holzinger Raphael
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Plankensteiner David
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Ostermann Laurin
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Ritsch Helmut
Generically, a laser is composed of an optical resonator coupled to a gain
medium. If the light amplification via stimulated emission dominates the mirror
losses, the emitted light is coherent...Recent studies have shown that
sub-wavelength sized rings of quantum emitters possess subradiant eigenmodes
which mimic high-Q optical resonators. We add a continuously pumped atom as a
gain medium in the ring's center creating a minimalistic coherent light source. The system behaves like a thresholdless laser, featuring a narrow linewidth
well below the natural linewidth of the constituent atoms.(read more)