Narrow linewidth exciton-polariton laser
arxiv(2024)
摘要
We present a high-resolution spectroscopic investigation of the energy and
linewidth of an exciton-polariton laser in the single-mode regime, which
derives its coherent emission from an optically pumped and confined
exciton-polariton condensate. We report an ultra-narrow linewidth of 56 MHz or
0.24 μeV, corresponding to a coherence time of 5.7 ns. The narrow linewidth
is consistently achieved by using an exciton-polariton condensate with a high
photonic content confined in an optically induced trap. Contrary to previous
studies, we show that the excitonic reservoir created by the pump and
responsible for creating the trap does not strongly affect the emission
linewidth as long as the condensate is trapped and the pump power is well above
the condensation (lasing) threshold. Our results open up opportunities for
manipulating the macroscopic quantum state of the system owing to its long
coherence time.
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