Raman-free, noble-gas-filled PCF source for ultrafast, very bright twin-beam squeezed vacuum
Abstract
We report a novel source of twin beams based on modulational instability in high-pressure argon-filled hollow-core kagom\'e-style photonic-crystal fibre. The source is Raman-free and manifests strong photon-number correlations for femtosecond pulses of squeezed vacuum with a record brightness of ~2500 photons per mode. The ultra-broadband (~50 THz) twin beams are frequency tunable and contain one spatial and less than 5 frequency modes.
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