Journal
NEW JOURNAL OF PHYSICS
Volume 18, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/10/103012
Keywords
Bose-Einstein condensation; microcavity; light-matter interactions; fluorescent dye; non-equilibrium
Categories
Funding
- UK EPSRC [EP/J017027/1]
- UK EPSRC (Controlled Quantum Dynamics) [CDTEP/L016524/1]
- ERC (via ODYCQUENT)
- Engineering and Physical Sciences Research Council [1517131, EP/J017027/1] Funding Source: researchfish
- EPSRC [EP/J017027/1] Funding Source: UKRI
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We report on the observation of quantum coherence of Bose-Einstein condensed photons in an optically pumped, dye-filled microcavity. We find that coherence is long-range in space and time above condensation threshold, but short-range below threshold, compatible with thermal-equilibrium theory. Far above threshold, the condensate is no longer at thermal equilibrium and is fragmented over non-degenerate, spatially overlapping modes. A microscopic theory including cavity loss, molecular structure and relaxation shows that this multimode condensation is similar to multimode lasing induced by imperfect gain clamping.
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