A monolithic cavity SPDC source produces heralded photons at 1540 nm with 168 MHz bandwidth, 70% efficiency, and 96.2% spectral purity after etalon isolation.
Ahlrichs,Triply-resonant cavity-enhanced spontaneous parametric down-conversion(Humboldt Universitaet zu Berlin (Germany), 2019)
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Pure narrowband photon-pair generation in a monolithic cavity
A monolithic cavity SPDC source produces heralded photons at 1540 nm with 168 MHz bandwidth, 70% efficiency, and 96.2% spectral purity after etalon isolation.