TY - JOUR
T1 - Narrow-linewidth exciton-polariton laser
AU - Fabricante, Bianca Rae
AU - Król, Mateusz
AU - Wurdack, Matthias
AU - Pieczarka, Maciej
AU - Steger, Mark
AU - Snoke, David W.
AU - West, Kenneth
AU - Pfeiffer, Loren N.
AU - Truscott, Andrew G.
AU - Ostrovskaya, Elena A.
AU - Estrecho, Eliezer
N1 - Publisher Copyright:
© 2024 Optica Publishing Group.
PY - 2024/6/20
Y1 - 2024/6/20
N2 - Exciton-polariton lasers are a promising source of coherent light for low-energy applications due to their low-threshold operation. However, a detailed experimental study of their spectral purity, which directly affects their coherence properties, is still missing. Here, 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. The long coherence time of the exciton-polariton system uncovered here opens up opportunities for manipulating its macroscopic quantum state, which is essential for applications in classical and quantum computing.
AB - Exciton-polariton lasers are a promising source of coherent light for low-energy applications due to their low-threshold operation. However, a detailed experimental study of their spectral purity, which directly affects their coherence properties, is still missing. Here, 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. The long coherence time of the exciton-polariton system uncovered here opens up opportunities for manipulating its macroscopic quantum state, which is essential for applications in classical and quantum computing.
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U2 - 10.1364/OPTICA.525961
DO - 10.1364/OPTICA.525961
M3 - Article
AN - SCOPUS:85196836705
SN - 2334-2536
VL - 11
SP - 838
EP - 845
JO - Optica
JF - Optica
IS - 6
ER -