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Opto-Electronics and Communications Conference (OECC)

Pressure-tuned phase-matched generation of non-classical light in microstructured fibre

Nicolas Y. Joly, Jonas Hammer, Riccardo Pennetta, Andrea Cavanna, Maria V. Chekhova

Published Jul 1, 2018• 0 citations
Publisher

Abstract

We report on fine tuning of phase matching conditions by using high pressure argon gas and demonstrate tunable twin beams in hollow-core photonic crystal fibre and tunable third harmonic generation in tapered fibre.
DOI
10.1109/oecc.2018.8730108

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Optics Letters•May 7, 2018•24 citations
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.
Precise control of the dispersion landscape is of crucial importance if optical fibers are to be successfully used for the generation of three-photon states of light-the inverse of third-harmonic generation (THG). Here we report gas-tuning of intermodal phase-matched THG in sub-micron-diameter tapered optical fiber. By adjusting the pressure of the surrounding argon gas up to 50 bars, intermodally phase-matched third-harmonic light can be generated for pump wavelengths within a 15 nm range around 1.38 μm. We also measure the infrared fluorescence generated in the fiber when pumped in the visible and estimate that the accidental coincidence rate in this signal is lower than the predicted detection rate of photon triplets.