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Optica Laser Congress (ASSL, LAC, LS&C)

Twin Beams from Noble Gas Filled Kagomé-PCF

Maria V. Chekhova, Martin A. Finger, Nicolas Y. Joly, Philip St.J. Russell

Published Jan 1, 2016• 0 citations
Publisher

Abstract

We generate twin beams through modulational instability in Ar-filled hollow-core kagomé-PCF. The observed sidebands show photon-number correlations below the shot-noise level, no Raman noise, a single spatial mode, and tunable frequency mode content.
DOI
10.1364/lsc.2016.ltu5b.2

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Non-classical correlated twin beams can be generated through the modulational instability in a hollow-core photonic crystal fibre filled with a noble gas. Since the gain is provided by a monatomic gas, the influence of Raman effect, which is typical for fibre-based sources of entangled photons, is avoided. Additionally, the gas pressure together with the frequency chirp of the input pump pulse allow continuous tuning of the number of frequency modes of the twin beams. We combine spectral interferometry and single-shot measurement to retrieve the phase of the noise-driven generated sidebands.
We report a novel source of twin beams based on modulational instability in high-pressure argon-filled hollow-core kagome-style photonic-crystal fiber. 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. The presented source outperforms all previously reported squeezed-vacuum twin-beam sources in terms of brightness and low mode content.
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